34996350 Ford OBD1 Codes and Procedure

Ford Fuel Injection » How To Run a Self-Test

Page 1 of 4

How To Run a Self-Test Don’t worry if the Check Engine Light is not on, the computer will store lesser important codes without flashing lights in your face. First you need to find the self-test plugs to read codes from the EEC. There are 2 plugs to find. One is triangular and has 6 pins; it is called the Self-Test plug. The other is a smaller single pin plug; it is called the Self-Test Input (STI). These are what the plugs look like. The self-test plugs are located along the driver s side fender by the firewall on 1986-95 Mustangs.

The self-test plugs are located along the driver s side fender behind the air filter box on 1987-95 EFI trucks.

The self-test plugs were mounted on the passenger side fender on 1985-86 EFI trucks.

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7/20/2010

Ford Fuel Injection » How To Run a Self-Test

Page 2 of 4

How to Prepare for the Self-Test To check for codes without buying a code reader is simple. If your EEC is wired correctly, the engine light works, and there are not any electrical faults in the vehicle you can get the codes out of your EEC. 1. Turn key to OFF. 2. Get a length of wire that can connect the STI to the negative battery terminal or body ground. 3. Ground the Self-Test Input. 4. Get some paper and a pen. 5. Get comfortable in the drivers seat. 6. Try to keep your self from getting distracted from here on. 7. Turn key to RUN. 8. You will hear some relays engage and the fuel pumps prime the system. This is the EEC beginning the test. 9. When the fuel pumps stop be ready to count! If you are a lost soul that does not have a working engine light, or did not install a light into your dash don t fret. You can still get the codes. You still need that wire to ground out the STI. Now you will need one of the following tools; digital volt meter, analog volt meter, test light, or you can hook up any other 12 volt light that does not draw more than 0.5 watts max. 1. Turn key to OFF. 2. Get a length of wire that can connect the STI to the negative battery terminal or body ground. 3. Ground the Self-Test Input. 4. Attach one side of the test device to the Self-Test Output (STO). 5. Attach the other lead to the positive side of the battery. a) If you are using a digital voltmeter you ll want to use the continuity setting. b) If you are using an analog voltmeter you ll be counting the meter make sweeps. c) If you are using a cheep light you ll count like the rest of us. 6. Get some paper and a pen. 7. Get comfortable in the drivers seat. 8. Try to keep your self from getting distracted from here on. 9. Turn key to RUN.

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7/20/2010

Ford Fuel Injection » How To Run a Self-Test

Page 3 of 4

10. You will hear some relays engage and the fuel pumps prime the system. This is the EEC beginning the test. 11. When the fuel pumps stop be ready to count! How To Count “Check Engine” Light Blinks When the “Check Engine” light blinks during the test you will get several different blinks, the separation time between blinks is used to indicate what information is being displayed. Turn key to RUN. You will hear some relays engage and the fuel pumps prime the system. This is the EEC beginning the test. The fuel pumps will stop and the EEC will now begin giving codes. You may catch a brief flickering of the light. This is a rapid code read that is used by the code readers you can purchase. Do not worry all those rapid flashes you just say flicker buy will now be given at a slower pace of , 2, & 4 second pauses. First digit of first KOEO code (1/2 second between blinks) 2 second pause Second digit of first KOEO code (1/2 second between blinks) 4 second pause Next KOEO code Once all KOEO codes are read the EEC will repeat them 6 second pause Single Separator Blink (this indicates the change from KOEO codes to CM codes) 6 second pause Codes from Continues Memory (uses same 1/2, 2, and 4 second timing as KOEO codes and also repeats them) If nothing has been recorded by the EEC since last battery disconnect you will see: Blink - 2 sec - blink - 4 sec - blink - 2 sec - blink - 6 sec - blink - 6 sec - blink - 2 sec - blink - 4 sec - blink - 2 sec

blink

This translates into 11-11 current condition (KOEO) and 11-11 in the continues memory (CM); or SYSTEMPASS This may seem hard to count; recommendation is to record codes with slashes, and to lump them all together. Sort them out into numerical codes later. Here is an example of this:

This would give you codes; 41, 83, 14 & 18. If you miss some of the codes or feel you are counting wrong continue to count the remaining codes for practice and to compare to the next code test. When finished simply turn the key to OFF wait 15 seconds then back to RUN. The codes will be presented again. Complete list of 2-Digit Self-Test Codes and their definitions. Complete list of 3-Digit Self-Test Codes and their definitions. If you can not get codes; read about Solving a No Code Problem here. 

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7/20/2010

Ford Fuel Injection » 2 Digit Self-test Codes 11-32

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2 Digit Self-test Codes 11-32 Abbreviations: KOEO = Key On Engine Off CM = Continues Memory KOER = Key On Engine Running

# NC 10 11 12 13

KOEO CM KOER Code Definition X

X

X

X

14 15 16

X X X X X

X X X X X X X

17 18

X X

19 20 21 22 23 24 25

X

X X X X

X X X

X X X X X X X

X 26 X

X X

X

X

27 28

X X

29 30 31

X

X X

No Codes Cylinder #1 Failed Cylinder Balance Test. System pass! Cannot control RPM during ER Self-Test high RPM check. Cannot control RPM during ER Self-Test low RPM check. Two or more successive erratic Profile Ignition Pickup (PIP) pulses occurred, resulting in a possible engine miss or stall. EEC permanent Read Only Memory (ROM) test failed. EEC battery powered Keep Alive Memory (KAM) test failed. IDM signal not received. RPM too low to perform HEGO test. RPM below Self-Test limit with Idle Air Control off. SPOUT circuit open or spark angle word failure. IDM circuit failure or SPOUT circuit grounded. Failure in EEC internal voltage. Cylinder Identification CID circuit failure. RPM erratic, dropped too low during test. Cylinder #2 Failed Cylinder Balance Test. ECT out of self test range 0.3 to 3.7 volts. MAP/BP sensor out of self test range. Closed throttle TPS voltage higher or lower than expected. ACT sensor out of self test range 0.3 to 3.7 volts. Knock not sensed during dynamic test. MAF sensor was greater than 0.7 volts with engine off. MAF sensor was not between 0.2 and 1.5 volts with engine running. TOT sensor out of self test range. ? VAT sensor out of self test range. Loss of IDM, right side. Insufficient input from vehicle speed sensor. Cylinder #3 Failed Cylinder Balance Test. PFE or EVP circuit below minimum voltage of 0.24 volts.

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7/20/2010

Ford Fuel Injection » 2 Digit Self-test Codes 11-32

X X

32

X X

Page 2 of 3

PFE or EVP circuit has intermittently failed below minimum voltage of 0.24 volts. EVP circuit below minimum voltage of 0.24 volts. EVP circuit has intermittently failed below minimum voltage of 0.24 volts.

Codes 33-58 Codes 59-74 Codes 75-99 Three Digit Codes

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7/20/2010

Ford Fuel Injection » Two Digit Codes 33-58

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Two Digit Codes 33-58

#

KOEO CM KOER Code Definition

33 34 35

X X X X

X X

41

X X

42

X

43 44

X X X

45

X X X X X

48

X X X

49

53 54 55 56 57 58

X X

46

50 51 52

X X X

39 40

47

X X

X X X X X

X X

X

X X X

X X X X

X X X X

EGR valve opening not detected. PFE or EVP circuit above the closed limit of 0.67 volts. PFE or EVP circuit has intermittently failed above the closed limit of 0.67 volts. PFE or EVP circuit above the maximum limit of 4.81 volts. PFE or EVP circuit has intermittently failed above the maximum limit of 4.81 volts. AXOD converter bypass clutch not applying properly. Cylinder #4 Failed Cylinder Balance Test. HEGO sensor circuit indicates system lean (right side). No HEGO switching detected always lean (right side). HEGO sensor circuit indicates system rich (right side). No HEGO switching detected always rich (right side). HEGO lean at Full Throttle. Thermactor Air Injection system inoperative (Right side). DIS coil pack 3 circuit failure or coil 1 primary circuit failure. Thermactor secondary air is misdirected. DIS coil pack 1 circuit failure or coil 2 primary circuit failure. Thermactor air not bypassed during self test. 4WD switch closed. Measured air flow too low at base idle. Loss of IDM, left side. Measured air flow too high at base idle. SPOUT signal default to 10 BTDC. 1 - 2 shift error (E4OD). Cylinder #5 Failed Cylinder Balance Test. ECT sensor signal is greater than the Self-Test maximum of 4.6 volts. Power steering pressure switch always open or closed. TPS circuit above maximum 4.5 volts. TPS circuit has intermittently failed above maximum 4.5 volts. ACT sensor signal is greater than the Self-Test maximum of 4.6 volts. Keyed power input to processor is open. MAF circuit above maximum voltage of 4.5volts. TOT sensor output is greater than Self-Test maximum value of 4.8 volts. Octane adjust service pin in use / circuit grounded. AXOD Neutral pressure switch circuit failed open. VAT indicated -40 F / circuit open.

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7/20/2010

Ford Fuel Injection » Two Digit Codes 59-74

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Two Digit Codes 59-74

# 59

KOEO CM KOER Code Definition X X

X X

60 61 62 63 64

X X X X X X X X X

65 66 67 68 69 70 71 72

X X X

X X X X X X X X X

73 74

X X X

Low speed fuel pump circuit failure. 2 - 3 shift error (E4OD). Cylinder #6 Failed Cylinder Balance Test. ECT sensor is less than the Self-Test minimum of 0.2 volts. ECT sensor has intermittently failed below 0.2 volts. 4/3 or 3/2 pressure switch circuit failed open. Converter clutch error (E4OD). TPS circuit below minimum 0.6 volts. TPS circuit has intermittently failed below minimum 0.6 volts. ACT sensor is less than the Self-Test minimum of 0.2 volts. ACT sensor has intermittently failed below 0.2 volts. Overdrive OFF switch was not cycled during KOER test (user error). MAF sensor went below 0.4 volts during the last 80 warm-up cycles. TOT sensor output was less than Self-Test minimum value of 0.15 volts. Neutral safety circuit failure. A/C circuit was on during KOER Self-Test. Transmission recently overheated, or TOT sensor intermittently failed below 0.2 volts. 3 - 4 shift error. Cylinder #7 Failed Cylinder Balance Test. Software re-initialization detected or Cluster ControlAssembly circuit failed. Power interruption detected or Message Center Control Assembly circuit failed. Insufficient MAF/MAP change during Dynamic Response Test (user error). TPS senor did not exceed 25% rotation during Dynamic Response Test (user error). Brake On/Off switch not actuated during KOER test (user error).

KOEO = Key On Engine Off, CM = Continues Memory, KOER = Key On Engine Running Codes 10-32 Codes 33-58 Codes 75-99 Three Digit Codes

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7/20/2010

Ford Fuel Injection » Two Digit Codes 75-99

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Two Digit Codes 75-99

# 75 76 77 79 80 81

KOEO CM KOER Code Definition X X X X X X X

82 83 84 85 86

87

X X X X X X X

X X X X

X X

88

X X X

89 90

X X

91

X X X

92

X X

93 94

X X X

95

X

X

96

X

X

97

X X

X

Brake On/Off switch failure always ON. Insufficient VAT change during Dynamic Response Test (user error). System failed to recognize brief WOT during Dynamic Response Test (user error). A/C or defrost on during self test. Cylinder #8 Failed Cylinder Balance Test. Air management 2 circuit failure (AM2/TAD). MAP sensor vacuum was not greater than 2 in-Hg (7 kPa) during normal vehicle operation. Air management 1 circuit failure (AM1/TAB) . EGR Control solenoid circuit failure. High speed electro-drive fan circuit failure. Low speed fuel pump relay circuit open. EGR Vacuum Solenoid circuit failure. Canister Purge Solenoid circuit failure. 3 4 Shift solenoid circuit failure. Adaptive fuel limit reached. Fuel pump primary circuit failure. When the FP relay was activated by the EEC, voltage was not detected on the control circuit. Voltage was not detected on Fuel Pump Monitor while the engine was running. Electro-drive fan circuit failure. Loss of dual plug input control. Converter clutch solenoid circuit failure. All cylinders passed Cylinder Balance Test. Shift solenoid 1 circuit failure (E4OD). No HEGO switching detected always lean (left side). HEGO sensor circuit indicates system lean (left side). Shift solenoid 2 circuit failure (E4OD). No HEGO switching detected always rich (left side). HEGO sensor circuit indicates system rich (left side). Coast clutch solenoid circuit failure (E4OD). Converter clutch solenoid circuit failure (E4OD). Thermactor Air Injection system inoperative (left side). Fuel pump secondary circuit failure. The EEC senses infinite resistance to ground from the fuel pump on the Fuel Pump Monitor circuit. Fuel pump secondary circuit failure. The EEC did not sense battery voltage on the Fuel Pump Monitor circuit. Overdrive cancel indicator light circuit failure (E4OD). Electronic pressure control driver open in EEC (E4OD).

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7/20/2010

Ford Fuel Injection » Two Digit Codes 75-99

98

X X

99

X X

Page 2 of 3

Hard fault present. Electronic pressure control circuit failure (E4OD). EEC system hasn t learned to control idle.

KOEO = Key On Engine Off, CM = Continues Memory, KOER = Key On Engine Running Codes 10-32 Codes 33-58 Codes 59-74 Three Digit Codes

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7/20/2010

Ford Fuel Injection » 3 Digit Self-test Codes 111-171

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3 Digit Self-test Codes 111-171 Abbreviations: KOEO = Key On Engine Off CM = Continues Memory KOER = Key On Engine Running

# NC 111 112

When KOEO X X X

3-Digit Code Definitions CM X X

KOER

X X

X 113

X X

114 116 117

X X X

X X

X 118

X X

121

X

X X

122

X X

123

X X

124

X

125

X

126 128

X

X X

X

129

X

136 137 139

X X X

No Codes System pass ACT sensor signal is less than the Self-Test minimum of 0.2 volts. ACT circuit has intermittently failed below minimum 0.2 volts. ACT sensor signal is greater than the Self-Test maximum of 4.6 volts. ACT circuit has intermittently failed above the maximum of 4.6 volts. ACT out of self test range 0.3 to 3.7 volts. ECT out of self test range 0.3 to 3.7 volts. ECT sensor signal is less than the Self-Test minimum of 0.2 volts. ECT circuit has intermittently failed below minimum 0.2 volts. ECT sensor signal is greater than the Self-Test maximum of 4.6 volts. ECT circuit has intermittently failed above the maximum of 4.6 volts. Closed throttle TPS voltage higher or lower than expected. TP sensor was inconsistent with the MAF/MAP value in the last 80 drive cycles. TPS circuit below minimum 0.6 volts. TPS circuit has intermittently failed below minimum 0.6 volts. TP circuit above maximum 4.5 volts. TPS circuit has intermittently failed above maximum 4.5 volts. TP sensor was higher than expected with the MAF/MAP value in the last 80 drive cycles. TP sensor was lower than expected with the MAF/MAP value in the last 80 drive cycles. MAP/BP sensor out of self test range 1.4 to 1.6 volts. MAP sensor vacuum was not greater than 2 in-Hg (7 kPa) during normal vehicle operation. Insufficient MAF/MAP change during Dynamic Response Test. HEGO sensor circuit indicates system lean (left side) HEGO sensor circuit indicates system rich (left side) No HEGO sensor switching detected or disconnected

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7/20/2010

Ford Fuel Injection » 3 Digit Self-test Codes 111-171

141 144

X X

157

X

158

X

159

X

X

X 167

X

171

X

Page 2 of 3

(left side) HEGO sensor circuit indicates system lean (both sides) No HEGO sensor switching detected or disconnected (right side) MAF sensor went below 0.4 volts during the last 80 warm-up cycles. MAF sensor went above 4.5 volts during the last 80 warm-up cycles. MAF signal was greater than 0.70 volt during KOEO. MAF signal was not between 0.20 and 1.50 volts during KOER. TPS did not exceed 25% rotation during the Dynamic Response Test. Fuel system at adaptive limit, HEGO unable to switch (right side)

Codes 172-223 Codes 224-525 Codes 526-586 Codes 587-656 Codes 657-999 Two Digit Codes

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7/20/2010

Ford Fuel Injection » Three Digit Codes 172-223

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Three Digit Codes 172-223

#

When KOEO

3-Digit Code Definitions CM

172 173 174 175

X X

176 177 178 179

X X X X

181

X

182 183 184 185 186 187 188

X X X X X X X

189

X

191 192 193 194 195 211

X X

KOER

X X

X X X X

212 213 214 215 216 217 218 219

X X X X X X X

222 223

X X

X

HEGO sensor circuit indicates system lean (right side) HEGO sensor circuit indicates system rich (right side) HEGO switching time is slow Fuel system at adaptive limit, HEGO unable to switch (left side) HEGO sensor circuit indicates system lean (left side) HEGO sensor circuit indicates system rich (left side) HEGO switching time is slow. Right side still rich, at leanest adaptive limit, during part throttle. Right side still lean, at richest adaptive limit, during part throttle. Right side still rich, at leanest adaptive limit, at idle. Right side still lean, at richest adaptive limit, at idle. MAF higher than expected MAF lower than expected Injector pulse width longer than expected Injector pulse width shorter than expected Left side still rich, at leanest adaptive limit, during part throttle. Left side still lean, at richest adaptive limit, during part throttle. Left side still rich, at leanest adaptive limit, at idle. Left side still lean, at richest adaptive limit, at idle. Flexible Fuel sensor circuit failure. Run cylinder balance diagnostic test. Run cylinder balance diagnostic test. Two or more successive erratic Profile Ignition Pickup (PIP) pulses occurred, resulting in a possible engine miss or stall. Loss of IDM input to EEC or SPOUT circuit grounded. SPOUT circuit open Cylinder Identification (CID) circuit failure EEC detected coil 1 primary circuit failure EEC detected coil 2 primary circuit failure EEC detected coil 3 primary circuit failure Loss of IDM signal (left side) SPOUT failure, spark timing has defaulted to 10 degrees BTDC. Loss of IDM signal (right side) Loss of Dual Plug Inhibit control

KOEO = Key On Engine Off, CM = Continues Memory, KOER = Key On Engine Running Codes 111-171 Codes 224-525 Codes 526-586

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7/20/2010

Ford Fuel Injection » Three-Digit Codes 224-525

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Three-Digit Codes 224-525

#

When KOEO

224 225

3-Digit Code Definitions CM X

KOER

X

226 244 311 312 313 314 326

X

327

X

X X X X X X

X

X

X

328 332 334

X

X X X

X X X

335 336

X X

X

337

X

X

X

338 339 341

X

X X X

381

X

411 412 452

X X X

461 511 512

X

X X X

513 519 521

X

522 524

X X

X

525

X

X

X

X X

Erratic IDM input to processor Knock Sensor (KS) signal not sensed during dynamic response test. IDM signal not received Camshaft Position (CMP) Sensor failure. Thermactor air system inoperative (right side) Thermactor air misdirected upstream during self test. Thermactor air not bypassed during self test. Thermactor air system inoperative (left side) PFE or DPFE circuit voltage lower than expected with zero EVR duty cycle. DPFE or EVP circuit below minimum voltage of 0.2 volts. EVP circuit below minimum voltage of 0.24 volts. EGR valve opening not detected. DPFE or EVP circuit above the closed limit of 0.67 volts. PFE or DPFE sensor voltage out of Self-Test range. EVP or DPFE circuit voltage above maximum voltage with zero EVR duty cycle. DPFE or EVP circuit above the maximum limit of 4.81 volts. ECT lower than expected. ECT higher than expected. Octane Adjust shorting bar is not in or the OCT ADJ circuit is open. Frequent A/C compressor clutch (ACCS) cycling less than 8.5 seconds. Cannot control rpm during KOER low RPM check Cannot control rpm during KOER high RPM check Computer detected an error in the VSS or PSOM signal during the last 80 warm-up cycles. Engine over speed was detected EEC permanent Read Only Memory (ROM) test failed. EEC battery powered Keep Alive Memory (KAM) test failed. Failure in EEC processor internal voltage. Power steering pressure switch circuit open. Power steering pressure switch did not change state during KOER test. Vehicle not in PARK or NEUTRAL during KOEO When the PCM commanded the fuel pump on, voltage was not detected on FPM. Vehicle in gear or A/C on during Self-Test

KOEO = Key On Engine Off, CM = Continues Memory, KOER = Key On Engine Running

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7/20/2010

Ford Fuel Injection » Three-Digit Codes 526-586

Page 1 of 3

Three-Digit Codes 526-586

# 526 527 528 529

When KOEO X X

3-Digit Code Definitions CM

X X

532

X

533

X

536

X

538

X X

539 542 543

X X X

551 552 553 554

X X X X

556 557 558 559 563 564 565 566 569 571 572 578

X X X X X X X X X X X

X X

X X

X

579

X

581

X

582

KOER

X

583

X

584 585 586

X X X

Neutral Pressure Switch closed or A/C on Neutral Drive Switch open or A/C on Clutch Switch Circuit failure Data Communications Link or Electronic Instrument Cluster circuit failure. Data Communications Link or Electronic Instrument Cluster circuit failure. Data Communications Link or Electronic Instrument Cluster circuit failure. Brake On/Off circuit failure / switch not actuated during KOER test Insufficient RPM change during KOER dynamic response test/ Operator error A/C or Defroster ON during KOEO test Fuel pump circuit failure When the PCM commanded the fuel pump on, voltage was not detected on FPM. Intake Manifold Runner Control (IMRC) circuit failure Air management 1 circuit failure (AM1/TAB) Air management 2 circuit failure (AM1/TAD) Fuel Pressure Regulator Control (FPRC) solenoid circuit failure Fuel Pump circuit failure Fuel pump relay coil resistance failure EGR Vacuum Regulator circuit failure Air Conditioning On relay circuit failure High Speed Electro-Drive Fan circuit failure Electro-Drive Fan circuit failure Canister purge circuit failure 3 4 Shift Solenoid failure Canister purge 2 circuit failure EGR Atmospheric Regulator circuit failure. EGR Vacuum Regulator circuit failure. A/C Pressure (ACP) sensor VREF circuit is short to ground. A/C Pressure (ACP) sensor circuit is above maximum voltage. When the cooling fan was activated, the circuit exceeded current draw. Open or short to power in the power-to-cooling fan circuit. When the fuel pump was activated, the power-to-pump circuit exceeded the normal current draw. Variable Control Relay Module circuit grounded. A/C clutch circuit exceeded the normal current draw. A/C clutch circuit open or shorted to power

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7/20/2010

Ford Fuel Injection » Three-Digit Codes 587-656

Page 1 of 3

Three-Digit Codes 587-656

# 587 593 617 618 619 621 622 623 624

When KOEO X X

X X X X

625 626 627 628 629 631 632 633 634

X X X

636 637 638 639 641 643 645 646 647 648 649 651 652

X X X

X X

3-Digit Code Definitions CM X X X X X

X X

X X X

X X

X X

X X X X X

X

X X X X X X X

X

653 654 656

KOER

X X X

Data Communications Link (DCL) error Oxygen Sensor Heater circuit failure 1 - 2 shift error (E4OD) 2 - 3 shift error (E4OD) 3 - 4 shift error (E4OD) Shift solenoid #1 circuit failure Shift solenoid #2 circuit failure Overdrive light circuit failure Electronic Pressure Control solenoid or driver circuit failure Electronic Pressure Control driver open in EEC Coast clutch solenoid circuit failure (E4OD) Converter clutch solenoid circuit failure (E4OD) Converter clutch Lock-Up error (E4OD) Converter clutch control circuit failure Overdrive light circuit failure Overdrive cancel switch not changing state (E4OD) 4WD switch is closed Transmission Manual Lever Position Sensor circuit out of self test. TOT sensor voltage out of self test range. TOT sensor circuit above maximum voltage TOT sensor circuit below minimum voltage Insufficient input from the Transmission Speed Sensor Shift solenoid #3 circuit failure Converter Clutch Control circuit failure Incorrect gear ratio obtained for first gear Incorrect gear ratio obtained for second gear Incorrect gear ratio obtained for third gear Incorrect gear ratio obtained for fourth gear Electronic Pressure Control range failure Electronic Pressure Control circuit failure Modulated Converter Clutch Control solenoid output circuit error Transmission Control Switch was not cycled during KOER Self-Test. MLP sensor not in park position Converter Clutch Control continuous slip error detected

KOEO = Key On Engine Off, CM = Continues Memory, KOER = Key On Engine Running Codes 111-171 Codes 172-223 Codes 224-525 Codes 526-586 Codes 657-999

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7/20/2010

Ford Fuel Injection » Three-Digit Codes 657-998

Page 1 of 3

Three-Digit Codes 657-998

#

When KOEO

3-Digit Code Definitions

657 659

CM X X

667

X

668 675 691 998 NC

X X X X

X

KOER

X

Transmission over temperature condition occurred. High vehicle speed detected while the vehicle was in PARK. Transmission Manual Lever Position Sensor circuit shorted Transmission Manual Lever Position Sensor circuit open MLP circuit voltage was out of the expected range. 4WD switch circuit failure. Hard fault present No Codes

KOEO = Key On Engine Off, CM = Continues Memory, KOER = Key On Engine Running Codes 111-171 Codes 172-223 Codes 224-525 Codes 526-586 Codes 587-656 Two Digit Codes

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7/20/2010