Cruise Control, Fault Tracing (2).pdf

Volvo Trucks Trucks North America, America, Inc. Greensboro, NC USA

Service Bulletin Trucks Date

Group

No.

11.2002

275

1 13 3

Page

 

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Cruise Control Fault Tracing Checklist K D12D

Cruise Control, Fault Tracing Checklist K

T2018950

This information covers fault tracing the cruise control function of the Volvo D12D engine.

Contents Guide to Fault Tracing” page 2 • “General Guide Control, Volvo Volvo Engine” Engine” page 3 • “Overview of Cruise Control, Control” page 5 • “Checklist K, Cruise Control” Control, Fault Tracing” page page 7 • “Cruise Control, NOTE: Information NOTE:  Information is subject to change without notice. Illustrations are used for reference only, and may differ slightly from the actual engine version. However, key components addressed in this information are represented as accurately as possible.

Page 2

General Guide to Fault Tracing (See also “Cruise Control, Fault Tracing” page 1.)

You must read and understand the precautions and guidelines in Service Information, group 20, "General Safety Practices, Engine" before performing any procedure. If you are not properly trained and certified in a procedure, ask your supervisor for training before you perform it.

To use this checklist: 1

• • •

2

Use the recommendations in appropriate symptom information, plus the information gathered above to provide a foundation for continued fault tracing using this checklist.

Complete basic data gathering Read fault codes Check vehicle parameters

One fault often affects other systems. Therefore, it is important to confirm or  eliminate suspected causes of faults at an early stage, using tests in VCADS  Pro.

Volvo Trucks North America, Inc. Service Bulletin

Date  

11.2002

Group

  275

No.

13

Page  

Overview of Cruise Control, Volvo Engine

W2003971

It is important to understand the function of the system when fault tracing. Follow the fault tracing sequence in the checklist to avoid possible replacement of non-defective components.

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Page 4

Operation

Brake Test

Cruise control is activated by positioning the switch on the cruise controller (S25) in the ON  position and by pressing SET +/–  at a set speed. The VECU (A17) detects the controller signal and forwards them to the engine control unit (A14).

For cruise control to be activated, a brake test must first be approved by depressing the brake pedal for approximately 2 seconds.

Pressing SET + increases speed; SET – reduces speed. When SET +/– is released, the vehicle speed is programmed into the VECU (A17), provided that the speed is within the cruise control speed interval. Parameters BK and AI determine the minimum speed and maximum speed of the cruise control. The vehicle speed sensor (B68) transmits information about the speed to the VECU (A17) which compares this with the set speed. The cruise control is disengaged when the brake pedal (S59) or the clutch pedal (S58) are depressed. The previous set speed is stored in VECU memory. When the cruise control switch is in the  RESUME position, the vehicle will return to the previously stored speed. Cruise control can also be completely disengaged by moving the switch to the  OFF  position.

When the brake lamp is activated by the pressure switch (S48), a signal is transmitted from the pressure switch via the lamp control unit (LCM) (A27) — the exterior lighting control unit to the VECU (A17), which also receives a signal from the brake pedal switch (S59). Both the signals must be active in order for the brake test to be approved. The VECU stores the fact that the brake test has been approved in the memory. It is now possible to activate cruise control.

Volvo Trucks North America, Inc. Service Bulletin

Date  

11.2002

Group

  275

No.

Page

13

 

5(12)

Checklist K, Cruise Control See also:

• •

“General Guide to Fault Tracing” page 2 “Cruise Control, Fault Tracing” page 7

Vehicle

Chassis No.

Mileage

Customer Yes

1

“Fault Codes, Checking” page 7 Have the fault codes relating to cruise control been corrected? Action:

2

“Calibration-number (K), Checking” page 7

Calibration Number (K) VECU Is the calibration number correctly programmed? Action: 3a

“Cruise Control Function Test” page 8 Signal checks  Does the indicating lamp light up when switches are activated? Voltage supply switch, cruise control Voltage supply, pedal switches Status, cruise control, ON Status cruise control, RESUME Status cruise control, SET+/Does the indicating lamp for SET + light up after 1 second? Does the indicating lamp for SET - light up after 1 second? Does the indicator lamp only light up when the pedal is depressed? Status pedal switch, clutch Status pedal switch, brakes Status pressure switch, brake lamp Has the brake test been approved? Speed settings  Max speed

km/h (mph)

Min speed

km/h (mph)

Are the setting values within their permitted range?

No

Page 6

Vehicle

Chassis No.

Mileage

Customer Yes

3b

Test driving  Speed checks  Set Speed

km/h (mph)

Actual speed

km/h (mph)

Does set speed indicated correspond to actual speed? Signal checks  Does the indicating lamp light up when cruise control is active? Status cruise control, active Action Notes:

Completed by:

Dealer:

Date:

No

Volvo Trucks North America, Inc. Service Bulletin

Date  

11.2002

Group

  275

No.

13

2751-20-03-01 Cruise Control, Fault Tracing See also:

• •

“General Guide to Fault Tracing” page 2 “Checklist K, Cruise Control” page 5

Fault Codes, Checking Correct any fault codes relating to Cruise Control before beginning fault tracing. The following fault codes can affect Cruise Control function: MID 128

PID 84

FMI 9, 11

Vehicle speed

MID 128

PID 85

FMI 9

Cruise control, status switch

MID 128

PID 228

FMI 11

Calibration number (K)

MID 144

PID 84

FMI 2, 5, 8, 13

Vehicle speed

MID 144

PPID 70

FMI 4

Pedal switches

MID 144

PPID 76

FMI 3, 4

Brake lamp, status relay

MID 144

PPID 84

FMI 2, 3, 4, 5, 8, 13

Speed signal, status

MID 144

SID 243

FMI 7

Cruise control switch SET

MID 144

PSID 1

FMI 7

Solenoid valve

Calibration-number (K), Checking 1 Using the PC tool, check that the calibration number (K) is correctly set in the VECU. Also check that the EECU correctly reads the calibration number (K) for the VECU. 2 Check that the correct calibration number (K) is programmed (parameter ID: MH).

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Page 8

Cruise Control Function Test

Voltage power supply, pedal switches

Connect the PC tool to the vehicle’s diagnostics connector. Perform “Cruise control function, test”; follow instructions in VCADS Pro.

2

Special tools: 9813194, 9990014, 9990025, 9998533, 9998699, 85104406, 85104407, 85104410  Other special equipment: J-39200 

Explanations of results when testing

T2012907

Check that the indicator lamp in the test lights up when the test has started. T2012904

1 2 3

4

Active signal. Inactive signal. Fault in the reading. Restart the test and try again. Check the terminals for the diagnostic socket. Check the fault codes. The signal is not available. The function is not available on the vehicle.

3 If the lamp does not light up, there is no voltage available for the pedal switches and the cruise control function will not work. Fault code: MID 144, PPID 70, FMI 4. Fault-trace using fault code information, group 36.

Signal Checks Voltage supply switch, cruise control

Status, cruise control, ON 4

1

T2012906

Check that the indicator lamp lights up once the test has started. If the lamp does not light up there is no voltage to the control. Fault-trace using the wiring diagram.

T2012908

Check that the indicator lamp in the test lights up when the switch is set to the ON position .

Volvo Trucks North America, Inc. Service Bulletin 5 If the lamp does not light up, check the connector at the control as well as at the VECU. Also check that the wires are in good condition.

Date  

11.2002

Group

  275

No.

13

Status cruise control, SET+/10

6 If the connector and wires are in good condition, the fault is in the switch. See wiring diagram.

Status cruise control, RESUME 7 T2012909

Check that the indicator lamp for  SET +/– lights up in the test when SET + and SET – are held down. After approximately 1 second the indicator lamp should also light up.

T2012910

Check that the indicator lamp in the test lights up when the switch is set to the RESUME position.

8 If the lamp does not light up, check the connector at the control as well as at the VECU. Also check that the wires are in good condition.

11 If the lamp does not light up on both SET + and  SET –, check the connector at the control as well as at the VECU. Also check that the wires are in good condition.

12 If the connector and wires are in good condition, the fault is in the switch. See wiring diagram.

Status cruise control, SET – (coast) 9 If the connector and wires are in good condition, the fault is in the switch. See wiring diagram.

13 Check that the indicator lamp for  SET  – lights up in the test approximately 1 second after the SET – button is held down.

14 If the lamp does not light up, check the connector at the control as well as at the VECU. Also check that the wires are in good condition.

15 If the connector and wires are in good condition, the fault is in the switch. See wiring diagram.

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Page 10

Status cruise control, SET + (acceleration) 16 Check that the indicator lamp for  SET + lights up in the test approximately 1 second after the SET + button is held down.

21 Connect breakout harness 9813194 and breakout box 9998699 (use overlay 85104407) between PA connector and VECU. 22 With ignition key in ON position, check voltage at VECU.

17 If the lamp does not light up, check the connector at the control as well as at the VECU. Also check that the wires are in good condition. 18 If the connector and wires are in good condition, the fault is in the switch. See wiring diagram.

Status pedal switch, clutch

Measurement point

Expected value

PA8 (signal) PA12 (ground)

B+ V (pedal at rest; switch closed) 0 V (pedal depressed; switch open)

NOTE: When pedal is at rest, switch closed, B+ should be at PA8, and indicator should be OFF. When pedal is depressed, switch open, 0 V should be at PA8, and indicator should be ON.

19

23 If there is no voltage at PA8, check wire and connectors between VECU and switch. If okay, check power supply to the switch. If okay, the fault is most likely in the switch.

T2012911

Check that the indicator lamp in the test lights up when the clutch pedal is pressed down. 20 If the lamp  does not light up  when the clutch pedal is depressed, the cruise control function will not be switched off while in cruise mode. When the pedal is released (at rest), the circuit to the control unit is closed. Indicator lamp should be OFF. Proceed with next step is not functioning properly. NOTE: If the indicator lamp in the test lights up continuously, the cruise control function will not work.

Volvo Trucks North America, Inc. Service Bulletin

Date  

Status pedal switch, brakes

11.2002

Group

  275

No.

13

26 Connect breakout harness 9990025 and breakout box 9998699 (use overlay 85104410; use 18–pin scheme on overlay) to LCM (Light Control Module). Check resistance:

24

Measurement point

Expected value

LC1-12 (+) to ground

open circuit (pedal at rest; switch closed) < 10   (pedal depressed; switch open)

NOTE: Air system must be charged with air before pressure switch will function. T2012912

Check that the indicator lamp in the test lights up when the brake pedal is pressed down. If the lamp  does not light up  or lights up continuously, carry out checks in the same way as “Status pedal switch, clutch” page 10. Measurement point

Expected value

PA5 (signal) PA12 (ground)

B+ V (pedal at rest; switch closed) 0 V (pedal depressed; switch open)

Pressure switch, brake lamp 25 Check that the indicator lamp lights up when the brake pedal is depressed. If the lamp does not light up, the brake test will not be approved. Continue with next step; check ground signal to LCM.

27 Connect breakout harness 9813194 and breakout box 9990014 (use overlay 85104407) to PA connector at VECU. Connect breakout harness 9998533 and second breakout box 9990014 (use overlay 85104406) to PB connector. Check voltage: Measurement point

Expected value

PB27 (+) to PA12 (-) on VECU (A17)

open circuit (pedal at rest; switch closed) < 10   (pedal depressed; switch open)

NOTE: Air system must be charged with air before pressure switch will function. 28 If measurements are incorrect, check the connectors and wiring at pressure switch, LCM, as well as at VECU. Check for loose connections and open circuits. Refer to wiring diagram. 29 If the lamp does not light and the connectors and electrical wiring and pressure switch has correct ground, the fault is most likely in the brake pressure switch.

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Page 12

Brake Test 30 For the cruise control to function, the brake test must be approved (brakes must be applied prior to cruise activation). 31 Check that the indicator lamp in the test lights up after the pedal is depressed. Lamp should remain lit after pedal is depressed indicating that the brake test has been approved.

Settings Minimum speed, cruise control 1 Check that the value is within the permitted range. For information on parameter programming, refer to the VCADS Pro User manual.

Maximum speed, cruise control 2 Check that the value is within the permitted range. The value must be below the maximum value of the speed limits. For information on parameter programming, refer to the VCADS Pro User manual.

Test Drive 1 Check that the set speed corresponds to the actual speed when the cruise control is active, i.e. when the vehicle speed is checked by the cruise control function. 2 Check that the indicator lamp in the test lights up when the cruise control is active, i.e. when the vehicle speed is checked by the cruise control function.