Electronically Controlled Hydraulic System
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Chassis
ELECTRONICALLY CONTROLLED HYDRAULIC SYSTEM
77 11 304 402
JUNE 2001
"The repair methods given by the manufacturer in this document are based on the technical specifications current when it was prepared.
EDITION ANGLAISE All copyrights reserved by Renault.
The methods may be modified as a result of changes introduced by the manufacturer in the production of the various component units and accessories from which his vehicles are constructed."
Copying or translating, in part or in full, of this document or use of the service part reference numbering system is forbidden without the prior written authority of Renault.
© RENAULT 2001
Chassis
Contents Page
38 ELECTRONICALLY CONTROLLED HYDRAULIC SYSTEM
Electric power assisted steering Introduction Fault interpretation Status interpretation Parameter interpretation Help Customer complaints Fault finding charts
38-01 38-03 38-15 38-16 38-18 38-26 38-27
Anti-lock braking system Introduction XR25 fiche Interpretation of the XR25 bargraphs Fault interpretation Conformity check Help Customer complaints Fault finding chart
38-31 38-32 38-33 38-48 38-49 38-50 38-51 38-53
138 DAE Vdiag No.: 04
ELECTRONIC CONTROL SYSTEM Electric power assisted steering
38
FAULT FINDING - INTRODUCTION This document contains generic fault-finding procedures that apply to all 45 A and 60 A electric power assisted steering computers fitted to the Clio II. Type of computer: Program No.: Version No.: VDIAG No.:
45 A and 60 A electric power assisted steering. 52 for the 45 A. 21 for the 60 A. 83 for the 45 A. 54 for the 60 A. 04
To undertake fault finding on this system, it is essential to have the following items available: – the Fault Finding Technical Note for the vehicle, – the electrical circuit diagram of the function for the vehicle concerned, – the tools listed under Special tooling required.
GENERAL APPROACH TO FAULT FINDING: – Use one of the diagnostic tools to identify the system equipping the vehicle (reading the electric power assisted steering computer). – Locate the Fault finding documents corresponding to the system identified. – Take note of information contained in the introductory sections. – Read the faults stored in the computer memory and use the Fault interpretation section of the documents. Reminder: Each fault is interpreted for a particular type of storage (fault present, fault stored in memory, fault present or stored). The checks defined for handling each fault are therefore only to be performed if the fault shown by the diagnostic tool is interpreted in the document for its type of storage. The type of storage should be considered when setting up the diagnostic tool when the ignition is switched off and back on again. If a fault is interpreted when it is declared stored, the conditions for application of the diagnostic routine appear in the NOTES box. When these conditions are not satisfied, use the fault finding procedure to check the circuit of the faulty part since the fault is no longer present on the vehicle. Follow the same procedure when a fault is declared stored by the diagnostic tool but is only interpreted in the documentation for a present fault. – Perform the conformity check (appearance of possible incorrect operations not yet declared by the system's self diagnosis procedure) and apply the associated fault finding strategy according to results. – Confirm the repair (disappearance of the problem reported by the customer).
– Use the Customer complaints fault finding procedures if the fault persists.
DAE X65 Ph.2 V04 V1.0
38-1
DAE Vdiag No.: 04
ELECTRONIC CONTROL SYSTEM Electric power assisted steering
38
FAULT FINDING - INTRODUCTION Tooling required: – CLIP and NXR diagnostic tools only. – Multimeter. Connect the wire to the diagnostic socket and switch on the ignition. Clip or NXR: – Switch on the diagnostic tool, – Select the vehicle type, – Select the field: Power assisted steering, – Follow the fault finding procedure described previously. Note on the indicator lighting strategy for electric power assisted steering: – When starting up, the indicator light is on for 3 seconds continuously after the appearance of top dead centre. – The indicator light remains permanently lit when certain failures are detected. – The indicator light flashes during fault finding.
IMPORTANT: The Repair method must be followed when replacing any component on the electric power assisted steering system.
DAE X65 Ph.2 V04 V1.0
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DAE Vdiag No.: 04
ELECTRONIC CONTROL SYSTEM Electric power assisted steering
38
FAULT FINDING - FAULT INTERPRETATION
DF002 PRESENT or STORED
NOTES
1.DEF
COMPUTER 1.DEF : Supply relay permanently closed 2.DEF : Internal electronic fault
Processing priority in the event of stacked faults: This fault must be dealt with last.
NOTES
none
Replace the computer (refer to the Repair methods).
2.DEF
NOTES
none
Replace the computer (refer to the Repair methods).
AFTER REPAIR
Deal with any other possible faults. Switch off the ignition for 5 seconds. Switch on the ignition again. Clear the fault memory. DAE X65 Ph.2 V04 V1.0
38-3
ELECTRONIC CONTROL SYSTEM Electric power assisted steering
DAE Vdiag No.: 04
38
FAULT FINDING - FAULT INTERPRETATION
DF007 PRESENT or STORED
NOTES
VEHICLE SPEED SENSOR SIGNAL ABSENT 1.DEF : Inconsistency with engine speed 2.DEF : Vehicle speed information fault
First check that the speed information and the trip meter are working on the instrument panel. If this is not the case, consult the ABS fault finding procedure followed by that for the instrument panel. Proceed with any necessary repairs then, while driving, use the diagnostic tool to check that the vehicle speed on the electric power assisted steering computer is not zero (PR003). If it is, deal with this fault by following the procedure described below.
1.DEF
NOTES
none
Check the continuity and insulation between the connection: Computer track 9
ABS computer
Repair if necessary. Carry out a road test, use the diagnostic tool to check that the vehicle speed on the electric power assisted steering computer is not zero. The problem is solved if the speed is not zero; however, check the ABS fault finding. Otherwise, replace the computer (refer to the Repair methods). Note: Certain irregular and exceptional driving conditions may cause this fault to appear, for example: high engine speed on stopping (see: CHART 3 page 25).
2.DEF
NOTES
none
Check the absence of the speed information through parameter PR003. Check the continuity and insulation between the connection: Computer track 9
ABS computer
Repair if necessary. Carry out a road test, use the diagnostic tool to check that the vehicle speed on the electric power assisted steering computer is not zero. If this speed is correct, the (connection) problem is solved; however, check the ABS fault finding. Otherwise, replace the computer (refer to the Repair methods).
AFTER REPAIR
Deal with any other possible faults. Switch off the ignition for 5 seconds. Switch on the ignition again. Clear the fault memory. Check the presence of the speed information through parameter PR003. DAE X65 Ph.2 V04 V1.0
38-4
ELECTRONIC CONTROL SYSTEM Electric power assisted steering
DAE Vdiag No.: 04
38
FAULT FINDING - FAULT INTERPRETATION
DF028 PRESENT or STORED
NOTES
ENGINE SPEED ABSENT 1.DEF : Engine speed signal inconsistent
Apply this fault finding strategy whether the fault is present or stored. Special note: If the engine speed information does not work on the instrument panel tachometer, carry out the fault finding procedure on the injection computer.
Start the engine and check the speed information using the electric power assisted steering fault finding procedure (PR004). If the speed information is correct, the problem has disappeared (the fault may be stored but not present). This problem may have been caused by a faulty contact (check the appearance of the 20-track connector), or by failure of the injection computer (carry out the injection fault finding procedure). Consider the problem resolved. If the information is incorrect, proceed to the next box. Check the insulation and continuity between the connection: Computer track 19
Injection computer
Repair if necessary. Start the engine and check the speed information using the electric power assisted steering fault finding procedure (PR004). If the speed information is incorrect, carry out the injection fault finding procedure. If no problem is detected on the injection fault finding procedure, replace the electric power assisted steering computer (refer to the Repair methods). NOTE: Check the different functions that use this information. Repair if necessary.
AFTER REPAIR
Deal with any other possible faults. Switch off the ignition for 5 seconds. Switch on the ignition again. Clear the fault memory. Check the engine speed information through parameter PR004. DAE X65 Ph.2 V04 V1.0
38-5
ELECTRONIC CONTROL SYSTEM Electric power assisted steering
DAE Vdiag No.: 04
38
FAULT FINDING - FAULT INTERPRETATION
DF035 PRESENT or STORED
NOTES
CC, CC.0 or 1.DEF
VARIABLE POWER ASSISTED STEERING MOTOR CC : CC.0 : 1.DEF : 2.DEF :
Short circuit Short circuit to earth Motor in short circuit Open circuit or Internal electronic fault
If 2.DEF appears present, deal with it before CC, CC.0 or 1.DEF (possibility of a poor motor connection on the computer).
NOTES
none
Disconnect the electric motor from the computer. Switch the ignition on without starting the engine and check the following points without engaging the steering wheel: – Check the insulation between the following connections: Computer track 23 Computer track 24 Computer track 23 Computer track 23 Computer track 23
+ Battery + Battery Vehicle earth Vehicle earth Track 24 Computer
If one of the tests is negative, replace the computer (refer to the Repair methods). – Check the insulation between the following connections: Check the insulation between the following tracks, while gently turning the steering wheel: Engine wiring harness track 23 Engine wiring harness track 23
+ Battery Vehicle earth
If one of the tests is negative, replace the steering column (refer to the Repair methods).
AFTER REPAIR
Deal with any other possible faults. Switch off the ignition for 5 seconds. Switch on the ignition again. Clear the fault memory. DAE X65 Ph.2 V04 V1.0
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DAE Vdiag No.: 04
ELECTRONIC CONTROL SYSTEM Electric power assisted steering
38
FAULT FINDING - FAULT INTERPRETATION
DF035
CONTINUED
2.DEF
NOTES
If 2.DEF appears present, deal with it before CC, CC.0 or 1.DEF (possibility of a poor motor connection on the computer).
Check the condition and that the connection is correct on the power assisted steering motor connector. Repair if necessary. Switch off the ignition and wait 5 minutes. Switch off the engine (all connectors reconnected). Measure the voltage on terminals 23 and 24 without disconnecting the connector (pass the touch points along the wires through the rear of the connector). Turn the steering wheel approximately half a turn in one direction and then the other. Check that the voltage read on terminals 23 and 24 reverses when the direction of rotation of the steering wheel is changed. If no voltage can be read, check the engine connection and start the check once more. Switch off the ignition for 5 seconds. Switch on the ignition again. Clear the fault memory. Carry out a road test. If the fault is still present, replace the steering column (refer to the Repair methods).
AFTER REPAIR
Deal with any other possible faults. Switch off the ignition for 5 seconds. Switch on the ignition again. Clear the fault memory. DAE X65 Ph.2 V04 V1.0
38-7
ELECTRONIC CONTROL SYSTEM Electric power assisted steering
DAE Vdiag No.: 04
38
FAULT FINDING - FAULT INTERPRETATION
DF037 PRESENT or STORED
NOTES
1.DEF
BATTERY VOLTAGE 1.DEF : Faulty supply relay contact
Special note: Apply the fault finding technique below differently depending on whether the fault is indicated as present or stored. The vehicle engine must be started for the fault to be present. Begin the test by starting the engine, wait 3 seconds, then check whether the fault is present or stored.
NOTES
Fault present
Check the battery voltage. If it is not in the following range: 9.5 volts < correct voltage < 16 volts Carry out the operations necessary for bringing it within this range, or proceed to the next box. – Check the battery charge. – Check the charging circuit. – Check the tightness and the condition of the battery terminals. Check again for the presence of the fault. If the fault is no longer present but is stored, the repair has been made. If the battery voltage is not in the following range: 9.5 volts < correct voltage < 16 volts And the fault is still present, replace the computer (faulty supply relay contact).
1.DEF
NOTES
Fault stored
The stored fault indicates that the battery voltage has fallen in the past. – Check the charging circuit. – Check the tightness and the condition of the battery terminals. Check this fault on other computers, if necessary, and erase them from the diagnostic tool.
AFTER REPAIR
Deal with any other possible faults. Switch off the ignition for 5 seconds. Switch on the ignition again. Clear the fault memory. DAE X65 Ph.2 V04 V1.0
38-8
ELECTRONIC CONTROL SYSTEM Electric power assisted steering
DAE Vdiag No.: 04
38
FAULT FINDING - FAULT INTERPRETATION
DF038 PRESENT or STORED
NOTES
ANGLE SENSOR CO : Open circuit or sensor out of service 1.DEF : Sensor supply problem
If the two faults CO and CC.0 appear, deal with the CC.0 fault first, then carry out the test mentioned in the after repair box (parameter PR121). If this test is correct, then consider the CC.0 fault as solved. If it is not correct, deal with it.
CO
NOTES
none
Check the insulation and continuity between the connections: Computer track 4 Computer track 2 Computer track 13 Computer track 3
Track 4 Steering wheel angle sensor Track 1 Steering wheel angle sensor Track 3 Steering wheel angle sensor Track 2 Steering wheel angle sensor
Repair the wiring and connectors if necessary. (See the angle sensor connector localization diagrams page...). Start the vehicle and check if parameter PR121 varies when turning the steering wheel from left to right. If parameter PR121 varies when the steering wheel is turned, the problem is solved. With the engine started and the angle sensor connected, check the voltages between tracks 2 and 1, and 3 and 1 of the angle sensor. If these voltages move alternately between from 0V to 5V when the steering wheel is turned, replace the electric power assisted steering computer (refer to the Repair methods).
AFTER REPAIR
After repair, start the vehicle and check that parameter PR121 varies when turning the steering wheel. Deal with any other possible faults. Switch off the ignition for 5 seconds. Clear the fault memory. DAE X65 Ph.2 V04 V1.0
38-9
ELECTRONIC CONTROL SYSTEM Electric power assisted steering
DAE Vdiag No.: 04
38
FAULT FINDING - FAULT INTERPRETATION
DF038
CONTINUED
NOTES
If the two faults CO and CC.0 appear, deal with the CC.0 fault first, then carry out the test mentioned in the after repair box (parameter PR121). If this test is correct, then consider the CC.0 fault as solved. If it is not correct, deal with it.
1.DEF
NOTES
none
Check the insulation and continuity between the connections: Computer track 4 Computer track 2 Computer track 13 Computer track 3
Track 4 Steering wheel angle sensor Track 1 Steering wheel angle sensor Track 3 Steering wheel angle sensor Track 2 Steering wheel angle sensor
Repair the wiring and connectors if necessary. Reconnect the 20-track connector on the computer (do not reconnect the angle sensor side wiring harness). Switch the ignition on without starting the engine, then check for the presence of the 5V± 0.8V voltage between track 4 of the angle sensor wiring harness and the vehicle earth. If this voltage does not appear, switch off the ignition and check the 20-track connector again. If no fault is found, replace the computer (refer to the Repair methods). Reconnect the 20-track connector. With the ignition and the engine switched off, (do not reconnect the angle sensor side wiring harness) check that the resistance between track 1 of the angle sensor side wiring harness and the vehicle earth is equal to zero (check 1). If the resistance is not equal to zero, disconnect the 20-track connector and check that the resistance between track 2 of the computer and the vehicle earth is equal to zero (check 2). If both the checks are positive, go to the next stage. If check 1 is negative and check 2 positive, the problem is in the wiring harness or its connection. If both check 2s are negative, replace the computer (refer to the Repair methods). Check the resistance between track 4 steering wheel angle sensor and the vehicle earth. If the resistance is 40 - 50 mph (70 - 80 Km/h). (*) The angle value is relative while the zero calculation has not been made. It becomes absolute and thus centred in relation to the right-hand wheel position, when the zero calculation has been made.
DAE X65 Ph.2 V04 V1.0
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DAE Vdiag No.: 04
ELECTRONIC CONTROL SYSTEM Electric power assisted steering
38
FAULT FINDING - HELP
CF085: STEERING WHEEL ANGLE SENSOR PROGRAMMING PROCEDURE
Important:: The 45 A computer cannot be configured. The 60 A computer has four different adjustments. It is therefore necessary to select the appropriate braking assistance law when fitting the computer. (See the help chart on page 23). The computer is delivered with the default calibration law >. It is impossible to calibrate the computer if the vehicle is not stationary.
Different braking assistance levels: – Level 0: Minimum assistance – Level 1: Intermediate assistance – Level 2: Assistance specific to a driving school vehicle – Level 3: Maximum assistance Important: an inappropriate calibration level can lead to poorer performance. Note: To check that your calibration has been correctly carried out, refer to the identification screen: – ID008: CALIBRATION NUMBER (Example: for a 60 A computer with a calibration of Level 3
6003)
DAE X65 Ph.2 V04 V1.0
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ELECTRONIC CONTROL SYSTEM Electric power assisted steering
DAE Vdiag No.: 04
38
FAULT FINDING - HELP
Criteria for allocating assistance laws
General criteria: For a 185/55 R15 wheel rim in D4F or D7F fit the 60A electric power assisted steering law Level: 1 For a driving school vehicle fit the 60A electric power assisted steering law Level: 2 VEHICLE TYPE: BBXX 5-door Saloon CBXX 3-door Saloon LBXX 4-door Saloon SBXX Utility
45 A computer: 8 200 061 924 x Default calibration 60 A computers: 8 200 092 424 8 200 149 673 Law 3 Law 2 Law 1 Law 0
No change in the law of fitting
Level 3 Level 2 Level 1 Level 0
=
Engine Suffixes
E1 BBXX
E1 CBXX
E1 SBXX
E2 BBXX
E2 CBXX
E3 BXX
E3 CBXX
x
x x
x x
1 1
1 1
x x x 0 0 0
x x x 0 0 0
1 1 1
1 1 1
0 0
0 0
3 3
3 3
0
0
D4F D7F
712 746
x x
x x
D7F D7F D7F F9Q K4J K4J
764 726 746 782 710 711
x x x
x x x
K4M K4M K4M K9K K9K K9K
744 745 746 704 702 710
0
0
x x
3 0 0 0
0 0
0 0
DAE X65 Ph.2 V04 V1.0
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ELECTRONIC CONTROL SYSTEM Electric power assisted steering
DAE Vdiag No.: 04
38
FAULT FINDING - HELP
Criteria for allocating assistance laws
General criteria: For a 185/55 R15 wheel rim in D4F or D7F fit the 60A electric power assisted steering law Level: 1 For a driving school vehicle fit the 60A electric power assisted steering law Level: 2
VEHICLE TYPE: BBXX 5-door Saloon CBXX 3-door Saloon LBXX 4-door Saloon SBXX Utility
45 A computer: 8 200 061 924 x Default calibration 60 A computers: 8 200 092 424 8 200 149 673 Law 3 Law 2 Law 1 Law 0
No change in the law of fitting
Level 3 Level 2 Level 1 Level 0
Engine Suffixes
=
E5 BBXX
D4F D7F D7F D7F D7F
712 746 764 726 746
F9Q K4J K4J
782 710 711
K4M K4M K4M
744 745 746
K9K K9K K9K
704 702 710
E5 CBXX
ES BBXX
ES CBXX
1
1
for driving school vehicle 2 2 2
for alloy wheel rim 1
2 0 0 3 3
0 0 3 3
0
0
3
3
3
3
3 3
3 3
= = = = = = 2 2
= = =
DAE X65 Ph.2 V04 V1.0
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DAE Vdiag No.: 04
ELECTRONIC CONTROL SYSTEM Electric power assisted steering
38
FAULT FINDING - HELP
Location of the steering wheel angle sensor:
Key: 1 - Steering wheel angle sensor
DAE X65 Ph.2 V04 V1.0
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DAE Vdiag No.: 04
ELECTRONIC CONTROL SYSTEM Electric power assisted steering
38
FAULT FINDING - CUSTOMER COMPLAINTS
NOTES
Customer Complaints should only be investigated after a complete check has been run using the diagnostic tool.
NO DIALOGUE WITH THE COMPUTER
CHART 1
LOSS OF VEHICLE BRAKING ASSISTANCE WITHOUT WARNING
CHART 2
UNTIMELY LIGHTING UP OF THE INDICATOR LIGHT
CHART 3
NO ASSISTANCE SYMMETRY OVER ASSISTANCE OR UNDER ASSISTANCE
CHART 4
DAE X65 Ph.2 V04 V1.0
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ELECTRONIC CONTROL SYSTEM Electric power assisted steering
DAE Vdiag No.: 04
38
FAULT FINDING - FAULT FINDING CHARTS
NO DIALOGUE WITH THE COMPUTER
CHART 1
NOTES
None.
Check the vehicle's battery voltage. Try the diagnostic tool on another computer on the same vehicle or a different one. Check: – The connection between the diagnostic tool and the diagnostic socket (lead in good condition). – The fuses for electric power assisted steering, engine and passenger compartment. Repair if necessary. Check for + 12 volts on track 16 and for earth on track 5 and track 4 of the diagnostic socket. Repair if necessary. Check the insulation, continuity and absence of interference resistance on the connections between: Computer track 22 Computer track 15
Earth Diagnostic socket track 7
Repair if necessary.
AFTER REPAIR
Check using the diagnostic tool. DAE X65 Ph.2 V04 V1.0
38-27
ELECTRONIC CONTROL SYSTEM Electric power assisted steering
DAE Vdiag No.: 04
38
FAULT FINDING - FAULT FINDING CHARTS
CHART 2
LOSS OF VEHICLE BRAKING ASSISTANCE WITHOUT WARNING
NOTES
This customer complaint should only be investigated after a complete check has been run using the diagnostic tool.
The vehicle is no longer assisted if the electric power assisted steering fuse is damaged or supply is lost. The steering is then the same as for manual steering, manoeuvrable when driving even at low speed, but very difficult to manoeuvre when stopped. With no supply, the electric power assisted steering computer is no longer capable of lighting the warning light and so the driver is not made aware of the fault. The driver will only become aware through noticing the loss of assistance to the steering wheel. Check fuse F39 on the passenger compartment fuse board and fuse F14 on the engine fuse board. Change the fuses if necessary. Check the computer supply voltage: Computer track 10 Computer track 21
Vehicle earth Vehicle earth
Repair if necessary.
AFTER REPAIR
Check using the diagnostic tool. DAE X65 Ph.2 V04 V1.0
38-28
DAE Vdiag No.: 04
ELECTRONIC CONTROL SYSTEM Electric power assisted steering
38
FAULT FINDING - FAULT FINDING CHARTS
CHART 3
UNTIMELY LIGHTING UP OF THE INDICATOR LIGHT
NOTES
This customer complaint should only be investigated after a complete check has been run using the diagnostic tool.
The electric power assisted steering defect mode is not compatible with the petrol engine management defect mode when a fault arises in the motorised throttle control. When there is a fault in the engine, one of the defect modes in the engine management computer is to place the throttle in a fixed position, such that the engine speed will be above 2500 rpm so that the vehicle can be driven home or to a garage. If the driver stops at the side of the road, with such a fault, with the engine still running the electric power assisted steering defect mode is triggered after 20 seconds: Vehicle speed = 0 and engine speed > 2500 rpm, the electric power assisted steering computer activates a defect mode which leads to the lighting of the warning light for the electric power assisted steering and the significant hardening of the steering. If the driver sets off while the vehicle speed is more than 3 mph (5 Km/h), the vehicle will be assisted again and the warning light for the electric power assisted steering will go out. Refer to the fault finding strategy for Fault DF007, if it is present. If it is stored, proceed with erasing this fault.
AFTER REPAIR
Check using the diagnostic tool.
DAE X65 Ph.2 V04 V1.0
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DAE Vdiag No.: 04
ELECTRONIC CONTROL SYSTEM Electric power assisted steering
38
FAULT FINDING - FAULT FINDING CHARTS
NO ASSISTANCE SYMMETRY CHART 4
OVER ASSISTANCE OR UNDER ASSISTANCE
NOTES
Only consult this customer complaint after a complete check using the diagnostic tool.
Look at the calibration for the electric power assisted steering computer in the identification screen before any operation. For a similar steering wheel angle (positive or negative) in relation to the steering centre point, the driver will notice a different power assisted steering (in general, on assistance or increased effort). In this case check Parameter PR117 (electric power assisted steering engine torque), with the vehicle stopped and no action on the steering wheel. This parameter must be within the following range: from 0 to ± 0.3 Nm. If this is not the case, replace the steering column (refer to the Repair methods). If parameter PR117 is within the tolerance and there is no fault present or stored, proceed with a check of the front axle geometry and perform a road test (refer to the Repair methods).
AFTER REPAIR
Check using the diagnostic tool.
DAE X65 Ph.2 V04 V1.0
38-30
ELECTRONICALLY CONTROLLED HYDRAULIC SYSTEM 138 Anti-lock braking system
38
FAULT FINDING - INTRODUCTION CONDITIONS FOR APPLICATION OF THE TESTS DEFINED IN THIS FAULT FINDING The tests defined in this fault finding information must not be carried out on vehicles unless the description of the fault being dealt with corresponds exactly to the display on the diagnostic tool. If a fault is dealt with following flashing of a bargraph, the conditions for confirming the actual presence of the fault (and the necessity of carrying out the fault finding procedure) are given in the Notes box or at the beginning of the interpretation of the bargraph. If a bargraph is only interpreted if it is permanently lit up, carrying out the checks recommended in the fault finding information when the bargraph is flashing will not enable the origin of the storing of the fault to be located. In this case, only a check of the wiring and the connectors of the faulty component must be carried out (the fault is simply stored as it is not present at the time when the check is carried out). NOTE: Switch off the ignition before using the diagnostic tool. The new BOSCH 5.3 ABS computers fitted on the CLIO II are supported by the tachometer function. The computer is capable of supplying the vehicle speed signal to all users of this information in the vehicle (instrument panel, engine management, etc...). This vehicle speed signal will replace the one presently supplied by the speed sensor located on the gearbox. The ABS computer calculates the vehicle speed from the speed of the wheels and the circumference of the tyres fitted on the vehicle.
TOOLS REQUIRED FOR WORK ON THE ABS SYSTEM – XR25 (except tachometer function). – At least XR25 cassette no. 17. – NXR or CLIP stand following the May 99 update. (no access to the features of this computer with the XR25 and cassette no. 18). – Multimeter.
REMINDER: When there is intermittent fault storage, the ABS warning light will light up the next time the vehicle is used until the car reaches 7 mph (12 km/h). When the fault is stored, a counter linked to the fault is initialised with a value of 40. This value will decrease by 1 each time the ignition is switched on if the fault is not present when the vehicle speed exceeds 7 mph (12 km/h). When the reading on the counter is equal to 1, it remains at 1 and the fault is not erased. The instrument panel fitted on the modified tachometer version CLIO II is activated. It then performs the fault finding procedure on the connections for the ABS and brake warning lights. In this way the instrument panel lights up the warning lights when the ABS computer is not connected. The shunt in the ABS computer connector, which provided the earthing for the warning light lines while the computer was disconnected, disappears. In the absence of an entered tyre circumference, a fault is registered in the computer memory and the ABS warning light flashes. The ABS and EBD (Electronic Braking Distribution) functions are ensured but the vehicle speed is calculated with the maximum circumference. When the dialogue is established between the diagnostic tool and the ABS computer, the ABS and EBD (Electronic Braking Distribution) functions are interrupted, which gives rise to a risk of loss of control of the vehicle under emergency braking. For this reason, the dialogue is cut as soon as the vehicle speed exceeds 6 mph (10 km/h) to reestablish ABS and EBD functioning.
B65531.0
38-31
ELECTRONICALLY CONTROLLED HYDRAULIC SYSTEM Anti-lock braking system
38
FAULT FINDING - XR25 FICHE MODEL OF FICHE TO BE USED
FI11753 B65531.0
38-32
ELECTRONICALLY CONTROLLED HYDRAULIC SYSTEM Anti-lock braking system
38
FAULT FINDING - Interpretation of XR25 bargraphs BARGRAPH SYMBOLS – Of faults (always on coloured background): If lit, indicates a fault on the product tested. The associated text defines the fault. This bargraph may be: – Permanently lit : fault present – Flashing : fault stored – Light gone out : fault absent or not found
– Of status (always on white background): Bargraph always located on the top right-hand side. If lit, indicates establishment of dialogue with the product computer. If it remains off: – The code does not exist. – There is a fault in the tool, the computer or the XR25 /computer connection. The following bargraph representations indicate their initial status: Initial status: (ignition on, engine stopped, without operator action). or
Indefinite
is lit up when the function or the condition described on the fiche is carried out.
Off
On
goes out when the function or the condition described on the fiche is no longer carried out.
– Supplementary information: Some bargraphs have a "The command"..., when the bargraph is lit up, enables additional information regarding the type of fault or the status to be displayed.
B65531.0
38-33
ELECTRONICALLY CONTROLLED HYDRAULIC SYSTEM Anti-lock braking system
38
FAULT FINDING - Interpretation of XR25 bargraphs
1
NOTES
Right-hand bargraph 1 off
Fiche no. 53
Code present
None.
Ensure that the diagnostic tool is not causing the fault by trying to communicate with a computer on another car. If the diagnostic tool is not the cause of the fault and dialogue cannot be established with any other computer on the same vehicle, it may be that a faulty computer is disrupting fault finding lines K and L. Disconnect the computers one at a time to locate the fault. Check the voltage of the battery and carry out the operations necessary to obtain a voltage which is to specification (9.5 volts < U battery < 17.5 volts).
Check the presence and the condition of the ABS fuse on the passenger compartment fuse board (10A). Check that the computer connector is properly connected and check the condition of its wiring. Check the connection and condition of the connection at the intermediate junctions R107 dashboard/front of engine and R255 front of engine / ABS. Check the ABS earth wires (tighten the two earth screws above the ABS assembly) Check that the computer is correctly supplied: – earth on track 19 of the 31-track connector, – + after ignition feed on track 15 of the 31-track connector.
Ensure that the fault finding socket is correctly supplied: – + after ignition feed on track 16, – earth on track 5. Check the continuity and the insulation of the lines connecting the diagnostic socket / ABS computer: – between track 12 of the computer connector and track 15 of the diagnostic socket, – between track 11 of the computer connector and track 7 of the diagnostic socket.
If dialogue is still not established following these various checks, replace the ABS computer.
AFTER REPAIR
When communication is established, deal with any lit fault bargraphs.
B65531.0
38-34
ELECTRONICALLY CONTROLLED HYDRAULIC SYSTEM Anti-lock braking system
38
FAULT FINDING - Interpretation of XR25 bargraphs
1
NOTES
Left-hand bargraph 1 lit up
Fiche no. 53
Supply/Computer
None.
Check the condition and position of the 60A ABS fuse in the engine connection unit. Ensure continuity between the fuse and tracks 17 and 18 of the computer connector (presence of + before ignition on both tracks). Check the tightness and the condition of the battery terminals. Check the connections on the 31-track connector of the ABS computer. Check the ABS earths (above the hydraulic assembly) and visually check all the ABS wiring.
Erase the computer memory, exit the fault finding (G13*) and switch off the ignition. Carry out a new check using the diagnostic tool. If the power supply/computer fault persists, replace the ABS computer.
AFTER REPAIR
After replacing the computer, repeat the check with the diagnostic tool.
B65531.0
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ELECTRONICALLY CONTROLLED HYDRAULIC SYSTEM Anti-lock braking system
38
FAULT FINDING - Interpretation of XR25 bargraphs 2-3-4-5
Right or left-hand bargraphs 2, 3, 4 or 5 flashing
Fiche no. 53
Solenoid valves circuit
NOTES
Even if present at time of testing, these faults will always be declared by a flashing bargraph. To confirm the presence of these faults and thus the necessity of applying the fault finding procedure below, start control G20*. The fault is present if the bargraph lights up again at the end of the command. If bargraph 11 left-hand side is also lit up, deal with left-hand side bargraph 11 as a priority.
Check the ABS earth wires (tighten the two bolts above the ABS assembly). Check the condition and position of the 60A ABS fuse in the engine compartment connection unit. Check the connection and condition of the connections on the 31-track connector of the computer.
Erase the computer memory, exit the fault finding (G13*) and switch off the ignition. Switch on the ignition and perform a new test with the diagnostic tool using control G20. If the solenoid valve circuit fault reappears, replace the ABS computer.
AFTER REPAIR
Erase the computer memory (G0**). Perform a road test then check with the diagnostic tool. B65531.0
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ELECTRONICALLY CONTROLLED HYDRAULIC SYSTEM Anti-lock braking system
38
FAULT FINDING - Interpretation of XR25 bargraphs
6
NOTES
Left-hand bargraph 6 lit up
Fiche no. 53
Left front wheel sensor circuit
None.
Check the connection and the condition of the sensor connections. If the connector is correct, check the resistance of the sensor at its connector. Replace the sensor if its resistance is not approximately 1.6 Kohms (1.6 Kohms ± 320 ohms).
If the resistance is correct, check and ensure the continuity of the connections between the sensor connector and the computer connector: – between one track of the sensor connector and track 7 of the computer connector, – between the other track of the sensor connector and track 6 of the computer connector. Also check the insulation between these connections. Carry out a visual inspection of the sensor wiring and check the quality of the connection on the 31-track computer connector.
If the results of the checks are correct, reconnect the computer and the wheel speed sensor and then clear the computer memory. Exit fault finding mode (G13*) and switch off the ignition. Switch the ignition on and replace the sensor if the fault recurs. If the fault recurs after changing the sensor, change the computer.
AFTER REPAIR
Erase the computer memory (G0**). Perform a road test then check with the diagnostic tool. B65531.0
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ELECTRONICALLY CONTROLLED HYDRAULIC SYSTEM Anti-lock braking system
38
FAULT FINDING - Interpretation of XR25 bargraphs
6
NOTES
Right-hand bargraph 6 lit up
Fiche no. 53
Right front wheel sensor circuit
None.
Check the connection and the condition of the sensor connections. If the connector is correct, check the resistance of the sensor at its connector. Replace the sensor if its resistance is not approximately 1.6 Kohms (1.6 Kohms ± 320 ohms).
If the resistance is correct, check and ensure the continuity of the connection between the sensor connector and the computer connector: – between one track of the sensor connector and track 3 of the computer connector, – between the other track of the sensor connector and track 5 of the computer connector. Also check the insulation between these connections. Carry out a visual inspection of the sensor wiring and check the quality of the connection on the 31-track computer connector.
If the results of the checks are correct, reconnect the computer and the wheel speed sensor and then clear the computer memory. Exit fault finding mode (G13*) and switch off the ignition. Switch the ignition on and replace the sensor if the fault recurs. If the fault recurs after changing the sensor, change the computer.
AFTER REPAIR
Erase the computer memory (G0**). Perform a road test then check with the diagnostic tool. B65531.0
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ELECTRONICALLY CONTROLLED HYDRAULIC SYSTEM Anti-lock braking system
38
FAULT FINDING - Interpretation of XR25 bargraphs
7
NOTES
Left-hand bargraph 7 lit up
Fiche no. 53
Left rear wheel sensor circuit
None.
Check the connection and the condition of the sensor connections. Check the connections at the intermediate connection under the body (R101). If the connector and the junction are correct, check the sensor resistance on the connector. Replace the sensor if its resistance is not approximately 1.6 Kohms (1.6 Kohms ± 320 ohms).
If the resistance is correct, check and ensure the continuity of the connections between the sensor connector and the computer connector: – between one track of the sensor connector and track 8 of the computer connector (via track B of the connector under the body R101), – between one track of the sensor connector and track 9 of the computer connector (via track A of the connector under the body R101), Also check the insulation between these connections. Carry out a visual inspection of the sensor wiring and check the quality of the connection on the 31-track computer connector.
If the results of the checks are correct, reconnect the computer and the wheel speed sensor and then clear the computer memory. Exit fault finding mode (G13*) and switch off the ignition. Switch the ignition on and replace the sensor if the fault recurs. If the fault recurs after changing the sensor, change the computer.
AFTER REPAIR
Erase the computer memory (G0**) Perform a road test then check with the diagnostic tool. B65531.0
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ELECTRONICALLY CONTROLLED HYDRAULIC SYSTEM Anti-lock braking system
38
FAULT FINDING - Interpretation of XR25 bargraphs
7
NOTES
Right-hand bargraph 7 lit up
Fiche no. 53
Right rear wheel sensor circuit
None.
Check the connection and the condition of the sensor connections. Check the connections at the intermediate connection under the body (R101). If the connector and the junction are correct, check the sensor resistance on the connector. Replace the sensor if its resistance is not approximately 1.6 Kohms (1.6 Kohms ± 320 ohms).
If the resistance is correct, check and ensure the continuity of the connections between the sensor connector and the computer connector: – between one track of the sensor connector and track 1 of the computer connector (via track D of the connector under the body R101), – between the other track of the sensor connector and track 2 of the computer connector (via track C of the connector under the body R101). Also check the insulation between these connections. Carry out a visual inspection of the sensor wiring and check the quality of the connection on the 31-track computer connector.
If the results of the checks are correct, reconnect the computer and the wheel speed sensor and then clear the computer memory. Exit fault finding mode (G13*) and switch off the ignition. Switch the ignition on and replace the sensor if the fault recurs. If the fault recurs after changing the sensor, change the computer.
AFTER REPAIR
Erase the computer memory (G0**). Perform a road test then check with the diagnostic tool. B65531.0
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ELECTRONICALLY CONTROLLED HYDRAULIC SYSTEM Anti-lock braking system
38
FAULT FINDING - Interpretation of XR25 bargraphs 8
Left or right-hand bargraph 8 flashing
Fiche no. 53
Right or left front wheel sensor signal
NOTES
Even if they are present when the check is carried out, these faults will always be indicated by a left or right BG8 flashing. To confirm the presence of these faults and thus the necessity of applying the fault finding procedure below, carry out a road test. The fault is present if the bargraph is permanently lit during the test. If bargraphs 6 and 8 left-hand side are both lit up, deal with bargraph 6 first. If bargraphs 6 and 8 right-hand side are both lit up, deal with bargraph 6 first.
Check the condition of the wheel speed sensor mounting (position and torque tightening). Check the sensor/target air gap over one wheel revolution: 0.1 < air gap < 1.9. Check conformity of the target (condition, number of teeth=26)
Check the connection and the condition of the sensor connectors. If the connector is correct, check the resistance of the sensor at its connector. Replace the sensor if its resistance is not approximately 1.6 Kohms(1.6 Kohms ± 320 ohms).
Carry out a visual inspection of the sensor wiring and check the quality of the connection on the 31-track computer connector.
If the results of the checks are correct, reconnect the computer and the wheel speed sensor and then clear the computer memory. Exit fault finding mode (G13*) and switch off the ignition. Change the sensor if the fault recurs.
If the fault recurs after changing the sensor, it may be caused by a solenoid valve operating fault. It is therefore necessary to carry out the hydraulic check of the solenoid valves using the diagnostic tool with command G03* or G04* (refer to the Help section). If the 10 unlocking/locking cycle does not occur on one of the wheels, replace the hydraulic unit. If the hydraulic unit is not faulty, change the computer.
AFTER REPAIR
Erase the computer memory (G0**). Perform a road test then check with the diagnostic tool. B65531.0
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ELECTRONICALLY CONTROLLED HYDRAULIC SYSTEM Anti-lock braking system
38
FAULT FINDING - Interpretation of XR25 bargraphs 9
Left or right bargraph 9 flashing
Fiche no. 53
Right or left rear wheel sensor signal
NOTES
Even if they are present when the check is carried out, these faults will always be indicated by a flashing left or right-hand BG9 bargraph. To confirm the presence of these faults and thus the necessity of applying the fault finding procedure below, carry out a road test. The fault is present if the bargraph is permanently lit during the test. If bargraphs 7 and 9 left-hand side are both lit up, deal with bargraph 7 first. If bargraphs 7 and 9 right-hand side are both lit up, deal with bargraph 7 first.
Check the condition of the wheel speed sensor mounting (position and torque tightening). Check the connection and the condition of the sensor connectors. Check the connections at the intermediate connector under the body R101. If the connector is correct, check the resistance of the sensor at its connector. Replace the sensor if its resistance is not approximately 1.6 Kohms (1.6 Kohms ± 320 ohms).
Carry out a visual inspection of the sensor wiring and check the quality of the connection on the 31-track computer connector.
If the results of the checks are correct, reconnect the computer and the wheel speed sensor and then clear the computer memory. Exit fault finding mode (G13*) and carry out a road test. If the fault reappears, check the conformity of the target: condition, number of teeth = 26.
If the results of the checks are correct, clear the computer memory, exit from the fault finding and perform a road test. Change the sensor if the fault recurs.
If the fault recurs after changing the sensor, it may be caused by a solenoid valve operating fault. It is therefore necessary to carry out the hydraulic check of the solenoid valves using the diagnostic tool with command G05* or G06* (refer to the Help section). If the 10 unlocking/locking cycle does not occur on one of the wheels, replace the hydraulic unit. If the hydraulic unit is not faulty, change the computer.
AFTER REPAIR
Erase the computer memory (G0**). Perform a road test then check with the diagnostic tool. B65531.0
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ELECTRONICALLY CONTROLLED HYDRAULIC SYSTEM Anti-lock braking system
38
FAULT FINDING - Interpretation of XR25 bargraphs Right-hand bargraph 10 lit up or flashing 10
Fiche no. 53
Pump motor circuit XR25 Help: *30 earth
1.dEF: Permanent command or CO engine 2.dEF: Motor not turning over
NOTES
1.dEF
If bargraph 10 right-hand side is flashing, confirm the presence of the fault and therefore the need to apply the fault finding below, using command G20* with the diagnostic tool. The fault is present if the bargraph lights up again at the end of the command.
NOTES
Replace the computer if the pump motor is operating permanently.
Check the ABS earths (tightening of the two earth bolts above the hydraulic assembly). Check/ensure continuity between the ABS earth and track 16 of the computer connector. Check locking of the 2-track connector of the pump motor.
If all the checks are correct, reconnect the computer then erase its memory with command G0*. Exit fault finding mode (G13*) and carry out a road test. Change the computer if the fault recurs.
2.dEF
NOTES
None.
Replace the hydraulic assembly (mechanical locking of the pump, etc...).
AFTER REPAIR
Erase the computer memory (G0**). Perform a road test then check with the diagnostic tool. B65531.0
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ELECTRONICALLY CONTROLLED HYDRAULIC SYSTEM Anti-lock braking system
38
FAULT FINDING - Interpretation of XR25 bargraphs
11
NOTES
Left-hand bargraph 11 lit up
Fiche no. 53
Solenoid valve supply fault
None.
Carry out the operations necessary for obtaining correct voltage between tracks 19 and 17/18 of the 31-track ABS computer connector (9.5 volts < correct voltage < 17.5 volts): – Check the tightness and the condition of the battery terminals. – Check the 60A fuse in the engine connection unit (white base). – Ensure continuity between the 60A fuse and tracks 17 and 18 of the computer connector. – Check the ABS earths (tightening of the two earth bolts above the hydraulic assembly). – Check/ensure continuity between the ABS earth and track 19 of the computer connector.
If all the checks are correct, reconnect the computer then erase its memory with command G0**. Exit fault finding mode (G13*) and carry out a road test. Change the computer if the fault recurs.
AFTER REPAIR
Erase the computer memory (G0**). Perform a road test then check with the diagnostic tool.
B65531.0
38-44
ELECTRONICALLY CONTROLLED HYDRAULIC SYSTEM Anti-lock braking system
38
FAULT FINDING - Interpretation of XR25 bargraphs
12
NOTES
Left-hand bargraph 12 lit up or flashing
Fiche no. 53
Brake circuit
None.
Press the brake pedal while observing right and left-hand bargraph 13. Are the positions "pedal released" and "pedal depressed" registered?
YES
Check the two brake light bulbs and the earth of the rear light units (no earthing of track 14 across the bulbs when pedal is not depressed).
NO
Apply the fault finding described in the interpretation of bargraph 13 right and lefthand side for Bargraph 13 left-hand side off, brake pedal depressed.
AFTER REPAIR
Erase the computer memory (G0**). Perform a road test then check with the diagnostic tool.
B65531.0
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ELECTRONICALLY CONTROLLED HYDRAULIC SYSTEM Anti-lock braking system
38
FAULT FINDING - Interpretation of XR25 bargraphs
12
NOTES
Right-hand bargraph 12 flashing
Fiche no. 53
Target on one of the wheels
Even if present at moment of testing, this fault will always be declared by a right-hand side BG12 flashing. To confirm the presence of this fault and thus the necessity of applying the fault finding procedure below, carry out a road test. The fault is present if the bargraph is permanently lit during the test.
Check the quality of wheel speed sensor mountings (position and torque tightening). Check the conformity of the targets: condition, number of teeth = 26.
AFTER REPAIR
Erase the computer memory (G0**). Perform a road test then check with the diagnostic tool. B65531.0
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ELECTRONICALLY CONTROLLED HYDRAULIC SYSTEM Anti-lock braking system
38
FAULT FINDING - Interpretation of XR25 bargraphs
13
Right and left-hand bargraph 13
Fiche no. 53
Brake pedal Lit up on the left-hand side if the pedal is depressed. Lit up on the right-hand side if the pedal is not depressed
NOTES
Only carry out the checks if the lighting of the bargraph is not consistent with the position of the pedal.
Bargraph 13 left-hand side has gone out and the brake pedal is depressed
BG13 right-hand side remains permanently lit up. If brake lights operate: – Ensure continuity between dashboard/rear left junction R2 on track 3 and track 14 of the ABS computer connector. Dashboard/front of engine intermediate junctions R107 (track G7) and front of engine/ABS R255 (track 8). If the brake lights do not operate: – Check the condition and adjustment of the brake light switch and the 15A fuse for the brake lights (in the passenger compartment fuse board). Change it if necessary. – Disconnect the brake switch and then check/ensure the presence of +after ignition on track B1 of the connector. – - Check the operation of the brake switch contact (contact closed between tracks A3 and B1). – Check and ensure continuity between track A3 of the brake light switch connector and the dashboard/rear left hand side R2 on track 3.
Left-hand bargraph 13 lit up permanently
– Check the condition and the adjustment of the brake switch. Change it if necessary. – Check the operation of the brake switch contact (contact closed between tracks A3 and B1). Replace the brake light switch if there is permanent continuity between the two tracks. – Check and ensure insulation from 12 volts of the connection between track A3 of the brake light switch connector and track 14 of the ABS computer connector. Intermediate connection: Dashboard/front of engine R107 on track G7. Front of engine/ABS R255 on track 8.
AFTER REPAIR
Perform a road test then check with the diagnostic tool.
B65531.0
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ELECTRONICALLY CONTROLLED HYDRAULIC SYSTEM Anti-lock braking system
38
FAULT FINDING - Interpretation of faults
Tachometer function index not programmed 14G PRESENT
NOTES
None.
The Bosch 5.3 ABS computer with tachometer supplies the vehicle speed signal to all areas where this information is needed (instrument panel, engine management,etc...). This vehicle speed signal will replace the one supplied by the speed sensor located on the gearbox. The ABS computer calculates the vehicle speed from the speed of the wheels and the circumference of the tyres fitted on the vehicle. The tyre circumference must be programmed into the memory of a new computer. This consists of entering an index X using the diagnostic tool with the WHEEL DIAMETER CONFIGURATION command. Value of index X: 165/70/R13 175/70/R13 175/60/R14 165/65/R14
X = 108
175/65/R14 185/60/R14 185/55/R15 195/50/R15
X = 148
175/70/R14
X = 232
Once the index has been entered using the WHEEL DIAMETER CONFIGURATION command, clear the computer memory and then switch off the ignition. Use the Tachometric index parameter to check that the index has been entered correctly.
AFTER REPAIR
Clear the computer memory. Check again using the diagnostic tool. B65531.0
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ELECTRONICALLY CONTROLLED HYDRAULIC SYSTEM Anti-lock braking system
38
FAULT FINDING - CONFORMITY CHECK
NOTES
Only check the conformity after a full check using the diagnostic tool.
Order
Function
1
Computer conformity with tachometric function
2
Computer conformity without tachometric function
3
4
5
Computer configuration
Operation of ABS and brake warning lights Computer initialisation check Detection of brake pedal positions
Parameter/status checked or action PR012
Display/notes
COMPUTER NUMBER
Fault finding
None
#12 Ensure that the index entered corresponds to the tyres fitted to the vehicle (refer to the Help section)
None
Switch on the ignition
The warning lights come on for 3 seconds when the ignition is switched on
None
ET013
Ensure that the system recognises the DEPRESSED and RELEASED positions
MR337 Fault finding
PR030
TACHOMETRIC INDEX
BRAKE PEDAL
B65531.0
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ELECTRONICALLY CONTROLLED HYDRAULIC SYSTEM Anti-lock braking system
38
FAULT FINDING - HELP USE OF COMMANDS Control of the solenoid valves for checking the hydraulic system: G03* to G06* Lift the vehicle in order to be able to turn the wheels and check that they turn freely. Keep the brake pedal depressed to prevent the wheel to be tested from being turned by hand (do not brake so firmly that full brake power is reached). Enter G0X*
Ten cycles of unlocking/locking must be noted for the wheel concerned.
Control of the pump motor: G08* Tap G08* and press the brake pedal
Motor operation for 2 seconds should be detected.
Pump motor and solenoid valve control: G20* Tap G20* and press the brake pedal
Brief motor and solenoid valve operation must be noted.
Bleeding of hydraulic circuits: G15*3* front left/G15*4* front right/G15*5* rear left/G15*6* rear right Apply the procedure described in the section on Bleeding the circuits in the Workshop Repair Manual. SPECIAL NOTES REPLACING THE COMPUTER WITH TACHOMETRIC FUNCTION The Bosch 5.3 ABS computer with tachometer supplies the vehicle speed signal to all areas where this information is needed (instrument panel, engine management,etc...). This vehicle speed signal will replace the one supplied by the speed sensor located on the gearbox. The ABS computer calculates the vehicle speed from the speed of the wheels and the circumference of the tyres fitted on the vehicle. The tyre circumference must be programmed into the memory of a new computer. This consists of entering an index X using the diagnostic tool with the WHEEL DIAMETER CONFIGURATION command. Value of index X: 165/70/R13 175/70/R13 175/60/R14 165/65/R14
X = 108
175/65/R14 185/60/R14 185/55/R15 195/50/R15
X = 148
175/70/R14
X = 232
Once the index has been entered using the WHEEL DIAMETER CONFIGURATION command, clear the computer memory and then switch off the ignition. Use the Tachometric index parameter to check that the index has been entered correctly.
B65531.0
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ELECTRONICALLY CONTROLLED HYDRAULIC SYSTEM Anti-lock braking system
38
FAULT FINDING - CUSTOMER COMPLAINTS
NOTES
Only consult this customer complaint after a complete check using the diagnostic tool.
WARNING LIGHT FAULTS
The ABS warning light does not light up for 3 seconds after the ignition is switched on
CHART 1
The ABS warning light is permanently lit with the ignition on (with no fault being indicated by the diagnostic tool)
CHART 2
The ABS warning light and/or brake warning light comes on again after the engine is started
CHART 3
The ABS warning light and/or brake warning light is lit temporarily when driving
CHART 3
The brake warning light does not light up for 3 seconds after ignition is switched on
CHART 4
Brake warning light permanently lit, ignition on
CHART 5
The ABS and brake warning lights are lit up with the ignition on
CHART 6
FAULTS WHICH OCCUR WHEN BRAKING WITH ABS REGULATION
Locking of one or more wheels
CHART 7
Pulling
CHART 8
Drift
CHART 9
Unexpected ABS operation at low speed and with light pedal pressure
CHART 10
Unexpected ABS operation on a poor road surface
CHART 11
Unexpected ABS operation with use of special equipment (car phone, CB, etc...)
CHART 12
Lengthening of the brake pedal travel following ABS operation (with pedal receding when entering ABS regulation)
CHART 13
Spongy pedal
CHART 14
Brake pedal vibration
CHART 15
Noise from the pump, the pipes or the hydraulic unit
CHART 16
B65531.0
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ELECTRONICALLY CONTROLLED HYDRAULIC SYSTEM Anti-lock braking system
38
FAULT FINDING - CUSTOMER COMPLAINTS
NOTES
Only consult this customer complaint after a complete check using the diagnostic tool.
OTHER CASES
The ABS and brake warning lights do not light up, with the computer disconnected
CHART 17
No dialogue with the ABS computer
CHART 18
B65531.0
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ELECTRONICALLY CONTROLLED HYDRAULIC SYSTEM Anti-lock braking system
38
FAULT FINDING - FAULT FINDING CHARTS
CHART 1
ABS WARNING LIGHT DOES NOT LIGHT UP FOR 3 SECONDS WHEN IGNITION IS SWITCHED ON
NOTES
Only consult this customer complaint after a complete check using the diagnostic tool. The ABS and brake warning lights light up by the loss of earth on the connections.
Check the 15A fuse for the instrument panel on the passenger compartment fuse board (if the problem is common to all the instrument panel functions).
Switch off the ignition. Disconnect the computer, then switch on the ignition again.
yes
Check the computer connections. Replace the computer if the fault persists.
Does the ABS warning light come on?
no
Check the condition of the ABS warning light bulb and its supply.Check the insulation against earth of the connection between track 20 of the computer connector and the ABS warning light. If the fault persists, check the operation of the instrument panel.
AFTER REPAIR
Perform a road test followed by a test using the diagnostic tool.
B65531.0
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ELECTRONICALLY CONTROLLED HYDRAULIC SYSTEM Anti-lock braking system
38
FAULT FINDING - FAULT FINDING CHARTS
CHART 2
THE ABS WARNING LIGHT IS PERMANENTLY LIT WITH THE IGNITION ON (with no fault being indicated by the diagnostic tool)
NOTES
Only consult this customer complaint after a complete check using the diagnostic tool. The ABS and brake warning lights light up by the loss of earth on the connections.
Disconnect the R255 front end of engine/ABS connection. Connect track 10 on the instrument panel side to earth and then switch on the ignition. yes Has the ABS warning light gone out?
Test the connections on the computer connector and the R255. Ensure continuity of the connection between track 20 of the ABS computer connector and R255 on track 10.
no
Ensure continuity of the connection between the instrument panel and track 10 of the R255. Check the wiring of the instrument panel connector. If the fault persists, check the operation of the instrument panel.
AFTER REPAIR
Perform a road test followed by a test using the diagnostic tool.
B65531.0
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ELECTRONICALLY CONTROLLED HYDRAULIC SYSTEM Anti-lock braking system
38
FAULT FINDING - FAULT FINDING CHARTS
CHART 3
ABS AND/OR BRAKE WARNING LIGHT RE-LIGHTS AFTER STARTING THE ENGINE UNTIMELY LIGHTING OF THE ABS AND/OR BRAKE WARNING LIGHT WHEN DRIVING
NOTES
Only consult this customer complaint after a complete check using the diagnostic tool. The ABS and brake warning lights light up by the loss of earth on the connections.
Check the voltage of the computer power supply: 9.5 volts < correct voltage < 17.5 volts. If necessary, carry out the following operations: – Check the battery charge (check the charging circuit if necessary). – Check the tightening and the condition of the battery terminals. – Check the ABS earths (tightening of the two earth bolts above the ABS assembly). Ensure continuity of the connection between track 20 of the ABS computer connector and the ABS warning light. Ensure continuity of the connection between track 21 of the ABS computer connector and the brake warning light. Test the connections on these two connections.
AFTER REPAIR
Perform a road test followed by a test using the diagnostic tool.
B65531.0
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ELECTRONICALLY CONTROLLED HYDRAULIC SYSTEM Anti-lock braking system
38
FAULT FINDING - FAULT FINDING CHARTS
CHART 4
THE BRAKE WARNING LIGHT DOES NOT LIGHT UP FOR 3 SECONDS AFTER THE IGNITION IS SWITCHED ON
NOTES
Only consult this customer complaint after a complete check using the diagnostic tool. The ABS and brake warning lights light up by the loss of earth on the connections.
Check the 15A fuse for the instrument panel on the passenger compartment fuse board (if the problem is common to all the instrument panel functions).
Switch off the ignition. Disconnect the computer, then switch on the ignition again.
yes
Test the connections on the computer connector. Replace the computer if the fault persists.
Does the brake warning light come on?
no
Check the condition of the brake warning light bulb and its supply. Check the insulation against earth of the connection between track 21 of the computer connector and the brake warning light. If the fault persists, check the operation of the instrument panel.
AFTER REPAIR
Perform a road test followed by a test using the diagnostic tool.
B65531.0
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ELECTRONICALLY CONTROLLED HYDRAULIC SYSTEM Anti-lock braking system
38
FAULT FINDING - FAULT FINDING CHARTS
CHART 5
BRAKE LIGHT PERMANENTLY LIT WITH THE IGNITION ON
NOTES
Only consult this customer complaint after a complete check using the diagnostic tool. The ABS and brake warning lights light up by the loss of earth on the connections.
As this warning light is multifunctional: – Check the position of the handbrake and the circuit for its switch. – Check the brake fluid level in the reservoir. – Check the level of wear on the brake pads.
Disconnect the R255 front end of engine/ABS connection. Connect track 7 on the instrument panel side to earth and then switch on the ignition. yes
Has the brake warning light gone out?
Test the connections on the computer connector and the R255. Ensure continuity of the connection between track 21 of the ABS computer connector and the R255 on track 7.
no
Ensure continuity of the connection between the instrument panel and track 7 of the R255. Check the wiring of the instrument panel connector. If the fault persists, check the operation of the instrument panel.
AFTER REPAIR
Perform a road test followed by a test using the diagnostic tool.
B65531.0
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ELECTRONICALLY CONTROLLED HYDRAULIC SYSTEM Anti-lock braking system
38
FAULT FINDING - FAULT FINDING CHARTS
CHART 6
THE ABS AND BRAKE WARNING LIGHTS ARE PERMANENTLY LIT WITH THE IGNITION ON
NOTES
Only consult this customer complaint after a complete check using the diagnostic tool.
Check the ABS 10A fuse on the passenger compartment fuse board. Check the ABS earths (tightening of the two screws above the hydraulic assembly). Check that the computer and intermediate connections R107 dashboard/front of engine and R255 front of engine/ABS are correctly connected (also check the condition of the connections). Check that the computer is correctly supplied: – Ensure the presence of + after ignition feed on track 15 of the computer connector. – Ensure continuity with earthof tracks 16 and 19 of the computer connector.
If the problem persists, consult CHART 2 and CHART 5.
AFTER REPAIR
Perform a road test followed by a test using the diagnostic tool.
B65531.0
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38
FAULT FINDING - FAULT FINDING CHARTS
CHART 7
LOCKING OF ONE OR MORE WHEELS
NOTES
Only consult this customer complaint after a complete check using the diagnostic tool.
REMINDER: Wheel locking on a vehicle equipped with ABS or tyre grating, considered by the customer as locking, can be linked to a normal reaction of the system and should not be systematically considered as a fault: – Locking is allowed below 3 mph (6 km/h) (the system will not provide regulation). – Braking with ABS regulation on very poor roads (significant grating).
However, if the wheels are actually locking, lift the vehicle in order to be able to turn the wheels and check: – for possible reversal of the speed sensor connection. ● Use functions #01, #02, #03 and #04 turning the associated wheels and check the consistency of the results obtained. ● If the value measured is zero, turn the other wheels to confirm an electrical reversal of the sensors and repair the wiring. – for possible reversal of the pipes at the hydraulic unit. ● Use operations G03*, G04*, G05* and G06* while applying the brake and check for the ten cycles of unlocking/locking on the wheel concerned (refer to the Help section). ● If the ten cycles do not occur on the wheel tested, (wheel remains locked), see if they occur on another wheel (if a reversal is confirmed: repair). ● If the ten cycles do not occur on a wheel and the pipes are correctly connected, replace the hydraulic assembly. ● Check the condition of the ABS targets and that they conform. ● Also check the sensor/target air gap by rotating each front wheel one revolution (no checks permitted on rear axle): 0.1 mm < air gap on one turn forwards < 1.9 mm. If the fault persists following these checks, change the hydraulic unit.
AFTER REPAIR
Perform a road test followed by a test using the diagnostic tool.
B65531.0
38-59
ELECTRONICALLY CONTROLLED HYDRAULIC SYSTEM Anti-lock braking system
38
FAULT FINDING - FAULT FINDING CHARTS
CHART 8
PULLING
NOTES
Only consult this customer complaint after a complete check using the diagnostic tool.
Disconnect one wheel speed sensor. Start the engine and ensure that only the ABS fault warning light comes on. Do not drive the car if the brake fault warning light also lights up, as the brake compensator function is no longer assured. Carry out a road test with the ABS thus out of service. Does the fault persist under these conditions?
yes
If the brake pedal travel is relatively long, bleed the brake circuit. If the travel is normal, check the tyre pressures, the front axle, or for any leaks in the circuit.
no
Lift the vehicle so that you can turn the wheels and check to see if – the speed sensors have been incorrectly connected, – the pipes on the hydraulic unit have been reversed. To carry out these tests, refer to and apply the methods defined in CHART 7. Check the condition of the ABS targets and that they conform. Also check the sensor/target air gap by rotating each front wheel one revolution. If the fault persists, change the hydraulic unit.
AFTER REPAIR
Perform a road test followed by a test using the diagnostic tool.
B65531.0
38-60
ELECTRONICALLY CONTROLLED HYDRAULIC SYSTEM Anti-lock braking system
38
FAULT FINDING - FAULT FINDING CHARTS
CHART 9
DRIFT
NOTES
Only consult this customer complaint after a complete check using the diagnostic tool.
Disconnect one wheel speed sensor. Start the engine and ensure that only the ABS fault warning light comes on. Do not drive the car if the brake fault warning light also lights up, as the brake compensator function is no longer assured. Carry out a road test with the ABS thus out of service. Does the fault persist under these conditions?
yes
Road handling fault not connected with the ABS. Check the condition of the brake linings and that they are to specification and check the tyre pressures, the front axle, etc...
no
Normal behaviour linked to the operation of the system during the regulation phase in particular on surfaces with uneven grip or which are poorly coated.
AFTER REPAIR
Perform a road test followed by a test using the diagnostic tool.
B65531.0
38-61
ELECTRONICALLY CONTROLLED HYDRAULIC SYSTEM Anti-lock braking system
38
FAULT FINDING - FAULT FINDING CHARTS
CHART 10
UNEXPECTED ABS OPERATION AT LOW SPEEDS AND WHEN LITTLE PRESSURE APPLIED TO BRAKE PEDAL
NOTES
Only consult this customer complaint after a complete check using the diagnostic tool.
It is possible to feel brake pedal vibrations which are linked to reactions of the system in particular circumstances, such as: – Crossing rumble strips. – Tight cornering with lifting of the inside rear wheel. These vibrations may be associated with the simple activation of the brake compensator when pressure on the rear axle is limited. If the problem is different, check the speed sensors connectors (micro-breaks) as well as the air gaps.
AFTER REPAIR
Perform a road test followed by a test using the diagnostic tool.
B65531.0
38-62
ELECTRONICALLY CONTROLLED HYDRAULIC SYSTEM Anti-lock braking system
38
FAULT FINDING - FAULT FINDING CHARTS
CHART 11
UNEXPECTED ABS OPERATION ON A POOR ROAD SURFACE
NOTES
Only consult this customer complaint after a complete check using the diagnostic tool.
On poor road surfaces it is normal to feel jolts and vibrations of the pedal as well grating which is more significant than on good surfaces. The result is the impression of a variation in efficiency which should be considered normal.
AFTER REPAIR
Perform a road test followed by a test using the diagnostic tool.
B65531.0
38-63
ELECTRONICALLY CONTROLLED HYDRAULIC SYSTEM Anti-lock braking system
38
FAULT FINDING - FAULT FINDING CHARTS
CHART 12
UNEXPECTED ABS OPERATION WITH USE OF SPECIAL EQUIPMENT (radio, car phone, CB, etc...)
NOTES
Only consult this customer complaint after a complete check using the diagnostic tool.
Check that the equipment which is causing the problem is approved. Check that this equipment has been correctly installed without modification to the original wiring, in particular, that of the ABS (connections to earth and + after ignition/before ignition of the ABS are not permitted).
AFTER REPAIR
Perform a road test followed by a test using the diagnostic tool.
B65531.0
38-64
ELECTRONICALLY CONTROLLED HYDRAULIC SYSTEM Anti-lock braking system
38
FAULT FINDING - FAULT FINDING CHARTS
CHART 13
LENGTHENING OF THE BRAKE PEDAL TRAVEL FOLLOWING ABS OPERATION (with pedal receding when entering ABS regulation)
NOTES
Only consult this customer complaint after a complete check using the diagnostic tool.
Passage of air from the hydraulic unit regulation channels to the brake circuits. Bleed the circuits according to the procedure recommended in the Workshop Repair Manual (use of XR25 command modes). Following the operation, carry out a road test with ABS operation.
If the fault persists, carry out the above operation once or twice more. If the customer complaint is particularly pronounced and bleeding the circuit does not improve matters, change the hydraulic unit.
AFTER REPAIR
Perform a road test followed by a test using the diagnostic tool.
B65531.0
38-65
ELECTRONICALLY CONTROLLED HYDRAULIC SYSTEM Anti-lock braking system
38
FAULT FINDING - FAULT FINDING CHARTS
CHART 14
SPONGY PEDAL
NOTES
Only consult this customer complaint after a complete check using the diagnostic tool.
Air in the brake circuits. Bleed the circuits in the conventional way starting with the rear left brake, followed by front left and then front right. Repeat the operation if necessary.
AFTER REPAIR
Perform a road test followed by a test using the diagnostic tool.
B65531.0
38-66
ELECTRONICALLY CONTROLLED HYDRAULIC SYSTEM Anti-lock braking system
38
FAULT FINDING - FAULT FINDING CHARTS
CHART 15
BRAKE PEDAL VIBRATION
NOTES
Only consult this customer complaint after a complete check using the diagnostic tool.
Normal reaction of the brake pedal during an ABS operation or of limitation of pressure on the rear axle (brake compensator function).
AFTER REPAIR
Perform a road test followed by a test using the diagnostic tool.
B65531.0
38-67
ELECTRONICALLY CONTROLLED HYDRAULIC SYSTEM Anti-lock braking system
38
FAULT FINDING - FAULT FINDING CHARTS
CHART 16
NOISE FROM THE PUMP, PIPES OR HYDRAULIC ASSEMBLY
NOTES
Only consult this customer complaint after a complete check using the diagnostic tool.
– Vibration of the unit: check the presence and the condition of the unit bracket insulating silentbloc fittings. – Vibration of pipes: check that all pipes are well clipped into their retaining clips and that there is no contact between pipes or between pipes and bodywork. To determine the origin of the noise, it is possible to use functions G03*, G04*, G05* and G06* on the XR25 (refer to the Help section).
AFTER REPAIR
Perform a road test followed by a test using the diagnostic tool.
B65531.0
38-68
ELECTRONICALLY CONTROLLED HYDRAULIC SYSTEM Anti-lock braking system
38
FAULT FINDING - FAULT FINDING CHARTS
CHART 17
THE ABS AND BRAKE WARNING LIGHTS DO NOT LIGHT UP, WITH THE COMPUTER DISCONNECTED
NOTES
Only consult this customer complaint after a complete check using the diagnostic tool.
Disconnect the ABS computer. Check if the shunt is present between track 19 and tracks 20 and 21 of the computer connector.
AFTER REPAIR
Perform a road test followed by a test using the diagnostic tool.
B65531.0
38-69
ELECTRONICALLY CONTROLLED HYDRAULIC SYSTEM Anti-lock braking system
38
FAULT FINDING - FAULT FINDING CHARTS
CHART 18
LACK OF DIALOGUE WITH THE ABS COMPUTER
NOTES
Only consult this customer complaint after a complete check using the diagnostic tool.
Ensure that the diagnostic tool is not causing the fault by trying to communicate with a computer on another car. If the diagnostic tool is not the cause of the fault and dialogue cannot be established with any other computer on the same vehicle, it may be that a faulty computer is disrupting fault finding bus K and L. Disconnect the computers one at a time to locate the fault. Check the voltage of the battery and carry out the operations necessary to obtain a voltage which is to specification (9.5 volts < U battery < 17.5 volts).
Check the presence and the condition of the ABS fuse on the passenger compartment fuse board (10 A). Check that the computer connector is properly connected and check the condition of its wiring. Check the connection and condition of the connection at the intermediate junctions R107 dashboard/front of engine and R255 front of engine / ABS. Check the ABS earth wires (tighten the two earth screws above the ABS assembly) Check that the computer is correctly supplied: – earth on track 19 of the 31-track connector, – + after ignition feed on track 15 of the 31-track connector,
Ensure that the diagnostic socket is correctly supplied: – +before ignition feed on track 16 – earth on track 5 Check the continuity and the insulation of the lines connecting the diagnostic socket / ABS computer: – between track 12 of the computer connector and track 15 of the diagnostic socket, – between track 11 of the computer connector and track 7 of the diagnostic socket.
If dialogue is still not established following these various checks, change the ABS computer.
AFTER REPAIR
Perform a road test followed by a test using the diagnostic tool.
B65531.0
38-70
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