Isuzu Cars and Trucks 1981-1991

Self-Diagnostic System

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All 1981 I-Mark, P'up and 1982 and 1983 (Exc. California) P'up

NOTE
These vehicles are not equipped with electronic engine controls. Refer to the individual components listed in this guide.

1982 and 1985 RWD I-Mark

The control unit system features a self-diagnosis function. The self-diagnosis function identifies troubles in the area related to the sensors, including wiring harnesses and ECM.

If a malfunction exists in the input signal to the control unit as a result of some trouble in the emission related components, the CHECK ENGINE light on the instrument panel will turn ON or flash to inform a presence of trouble. The system diagnosis should be performed in the following sequence:

  1. Diagnostic circuit check
  2.  
  3. Driver Complaint
  4.  
  5. System Performance Check
  6.  



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Fig. Emission control system 1982 and 1985 gasoline I-Mark

ENTERING SELF-DIAGNOSTIC SYSTEM
  1. With the ignition switch ON and engine not running, the light turns ON to indicate the circuit is in good condition. The light will turn OFF when the engine is started.
  2.  
  3. If the light stays ON after the engine is started, a malfunction exists in the signal to the control unit (ECM). The control unit will store a malfunction even if it an intermittent one. A poor contact may cause the light to come ON and then turn OFF when the circuit is completed, but the code will be stored even with the light OFF.
  4.  
  5. To diagnose a problem, ground the diagnostic terminal located under the instrument panel next to the steering column. With the engine running, the CHECK ENGINE light will flash to indicate the diagnostic code in the memory.
  6.  



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Fig. Assembly Line Diagnostic Link (ALDL) location 1982-85 I-Mark

  1. The codes consist of flashes and pauses to indicate trouble codes. Each component has a code designation. The code represents a 2 digit number as shown in the trouble code charts.
  2.  

Code 12 is 1 flash, a short pause and 2 flashes. This code means the idle position switch output terminal is in the high voltage state when it should be in the low voltage state.


NOTE
Trouble codes No. 12 through 15 may be indicated even when all systems are functioning normally. For instance, the trouble code No. 14 will be indicated without any trouble in the system if WOT condition is not brought about through the diagnostic procedure, but this does not indicate a faulty condition.

  1. If 2 or more areas are involved and that many codes are to be indicated, the CHECK ENGINE light indicates each code corresponding to the area of trouble 3 times in the increasing order of the code numbers and then repeats them.
  2.  


NOTE
Always write down the codes as they are flashing. This memory will be lost when the power to the control unit (ECM) is disconnected.



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Fig. Diagnostic Trouble Code (DTC) identification 1982 and 1985 RWD I-Mark



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Fig. Control unit (ECM) terminal identification



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Fig. Diagnostic circuit check 1982 and 1985 RWD I-Mark



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Fig. System performance check 1982 and 1985 RWD I-Mark



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Fig. Chart 1 1982 and 1985 RWD I-Mark



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Fig. Chart 2 1982 and 1985 RWD I-Mark



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Fig. Chart 3 1982 and 1985 RWD I-Mark



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Fig. Chart 4 1982 and 1985 RWD I-Mark



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Fig. Chart 5 1982 and 1985 RWD I-Mark



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Fig. Chart 6 1982 and 1985 RWD I-Mark



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Fig. Chart 7 1982 and 1985 RWD I-Mark



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Fig. Chart 8 1982 and 1985 RWD I-Mark



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Fig. Chart 9 1982 and 1985 RWD I-Mark



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Fig. Chart 10 1982 and 1985 RWD I-Mark



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Fig. Chart 11 1982 and 1985 RWD I-Mark



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Fig. Chart 13 1982 and 1985 RWD I-Mark



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Fig. Chart 14 1982 and 1985 RWD I-Mark



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Fig. Chart 15 1982 and 1985 RWD I-Mark



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Fig. Chart 16 1982 and 1985 RWD I-Mark



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Fig. Chart 17 1982 and 1985 RWD I-Mark

CLEARING TROUBLE CODES

The code will be stored until the power from the battery to the control unit is cut off. After correcting the problem, erase the memory by disconnecting the diagnostic terminal or disconnect the negative battery cable for more than 20 seconds. Disconnecting the battery cable will cancel clock, radio and any other memory functions.


NOTE
Some vehicle computers have a learning ability. If a change is noted in vehicle performance after clearing codes, it may be due to the computers learning ability. To restore performance, warm vehicle to normal operating temperature and drive at part throttle with moderate acceleration, before performing any additional diagnosis.

1982 and 1987 P'up (California)

The ECM (electronic control module) system features a self-diagnosis function. The self-diagnosis function identifies troubles in the area related to the sensors, including wiring harnesses and ECM.

If a malfunction exists in the input signal to the ECM as a result of some trouble in the emission related components, the CHECK ENGINE light on the instrument panel will turn ON or flash to inform a presence of trouble. The system diagnosis should be performed in the following sequence:

  1. Diagnostic circuit check
  2.  
  3. Driver Complaint
  4.  
  5. System Performance Check
  6.  

ENTERING SELF-DIAGNOSTIC SYSTEM
  1. With the ignition switch ON and engine not running, the light turns ON to indicate the circuit is in good condition. The light will turn OFF when the engine is started.
  2.  
  3. If the light stays ON after the engine is started, a malfunction exists in the signal to the control unit (ECM). The control unit will store a malfunction even if it an intermittent one. A poor contact may cause the light to come ON and then turn OFF when the circuit is completed, but the code will be stored even with the light OFF.
  4.  
  5. To diagnose a problem, connect both diagnostic terminals located under the instrument panel next to the steering column. With the engine not running, the CHECK ENGINE light will flash a code 12 to indicate the system is in the diagnostic mode. When the engine is started and the light stays ON, the diagnostic system has detected a fault.
  6.  
  7. Faults indicated by trouble codes 13, 31, 44 and 45 require engine operation at part throttle for up to five minutes after engine warm-up before the CHECK ENGINE light will come ON and store a trouble code.
  8.  
  9. The codes consist of flashes and pauses to indicate trouble codes. Each component has a code designation. The code represents a 2 digit number as shown in the trouble code charts.
  10.  

Code 12 is 1 flash, a short pause and 2 flashes. This code means the self-diagnosis system is working properly.

  1. If 2 or more areas are involved and that many codes are to be indicated, the CHECK ENGINE light indicates each code corresponding to the area of trouble 3 times in the increasing order of the code numbers and then repeats them.
  2.  


NOTE
Always write down the codes as they are flashing. This memory will be lost when the power to the control unit (ECM) is disconnected.



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Fig. Diagnostic terminal and Electronic Control Module (ECM) connector identification 1982 and 1987 P'up (California)



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Fig. Trouble code identification 1982 and 1987 P'up (California)



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Fig. Diagnostic circuit check 1982 and 1987 P'up (California)



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Fig. Driver complaint 1982 and 1987 P'up (California)



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Fig. System performance check 1982 and 1987 P'up (California)



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Fig. Chart 1, dwell fixed under 10and#x00B0; 1982 and 1987 P'up (California)



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Fig. Chart 2, dwell fixed between 10 and 1980and#x00B0; 1982 and 1987 P'up (California)



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Fig. Chart 3, dwell fixed over 80and#x00B0; 1982 and 1987 P'up (California)



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Fig. Chart 4, idle switch and WOT switch circuit test 1982 and 1987 P'up (California)



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Fig. Chart 5, CHECK ENGINE light inoperative 1982 and 1987 P'up (California)



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Fig. Chart 6, will not flash code 12 1982 and 1987 P'up (California)



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Fig. Trouble code 12, no reference pulses to the ECM 1982 and 1987 P'up (California)



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Fig. Trouble code 13, open oxygen sensor circuit 1982 and 1987 P'up (California)



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Fig. Trouble code 14, shorted coolant sensor circuit 1982 and 1987 P'up (California)



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Fig. Trouble code 15, open coolant sensor circuit 1982 and 1987 P'up (California)



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Fig. Trouble code 21, idle switch circuit open or WOT switch shorted 1982 and 1987 P'up (California)



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Fig. Trouble code 22, fuel cut solenoid circuit open or grounded 1982 and 1987 P'up (California)



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Fig. Trouble code 23, vacuum control (MC) solenoid circuit open or grounded 1982 and 1987 P'up (California)



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Fig. Trouble code 25, air switching solenoid circuit open or grounded 1982 and 1987 P'up (California)



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Fig. Trouble code 31, no reference signal 1982 and 1987 P'up (California)



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Fig. Trouble code 44, oxygen sensor, lean 1982 and 1987 P'up (California)



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Fig. Trouble code 45, oxygen sensor, rich 1982 and 1987 P'up (California)



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Fig. Trouble code 51, constant high voltage from fuel cut solenoid to ECM 1982 and 1987 P'up (California)



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Fig. Trouble code 52, RAM trouble 1982 and 1987 P'up (California)



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Fig. Trouble code 53, constant high voltage from air switching solenoid to ECM 1982 and 1987 P'up (California)



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Fig. Trouble code 54, constant high voltage from carburetor mixture control solenoid to ECM 1982 and 1987 P'up (California)



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Fig. Air management check 1982 and 1987 P'up (California)



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Fig. Idle and WOT switches check 1982 and 1987 P'up (California)



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Fig. Trouble code 55, A/D converter problem 1982 and 1987 P'up (California)



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Fig. Carburetor mixture control solenoid check 1982 and 1987 P'up (California)

CLEARING TROUBLE CODES

The code will be stored until the power from the battery to the control unit is cut off. After correcting the problem, erase the memory by removing the ECM fuse or disconnecting the negative battery cable for more than 20 seconds. Disconnecting the battery cable will cancel clock, radio and any other memory functions.


NOTE
Some vehicle computers have a learning ability. If a change is noted in vehicle performance after clearing codes, it may be due to the computers learning ability. To restore performance, warm vehicle to normal operating temperature and drive at part throttle with moderate acceleration, before performing any additional diagnosis.

1988 and 1991 P'up, Amigo

The ECM (electronic control module) system features a self-diagnosis function. The self-diagnosis function identifies troubles in the area related to the sensors, including wiring harnesses and ECM.

If a malfunction exists in the input signal to the ECM as a result of some trouble in the emission related components, the CHECK ENGINE light on the instrument panel will turn ON or flash to inform a presence of trouble. The system diagnosis should be performed in the following sequence:

  1. Diagnostic circuit check
  2.  
  3. Driver Complaint
  4.  
  5. System Performance Check
  6.  



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Fig. Wiring diagram, 1988 model 1988 and 1991 P'up and Amigo with carburetor



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Fig. Wiring diagram, 1989 model 1988 and 1991 P'up and Amigo with carburetor



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Fig. Wiring diagram 1988 and 1991 P'up and Amigo with EFI

ENTERING SELF-DIAGNOSTIC SYSTEM
  1. With the ignition switch ON and engine not running, the light turns ON to indicate the circuit is in good condition. The light will turn OFF when the engine is started.
  2.  
  3. If the light stays ON after the engine is started, a malfunction exists in the signal to the control unit (ECM). The control unit will store a malfunction even if it an intermittent one. A poor contact may cause the light to come ON and then turn OFF when the circuit is completed, but the code will be stored even with the light OFF.
  4.  
  5. To diagnose a problem, connect the white and black diagnostic terminals located under the instrument panel next to the left pick panel. With the engine not running, the CHECK ENGINE light will flash a code 12 to indicate the system is in the diagnostic mode. When the engine is started and the light stays ON, the diagnostic system has detected a fault.
  6.  
  7. Faults indicated by trouble codes 13, 31, 44 and 45 require engine operation at part throttle for up to five minutes after engine warm-up before the CHECK ENGINE light will come ON and store a trouble code.
  8.  
  9. The codes consist of flashes and pauses to indicate trouble codes. Each component has a code designation. The code represents a 2 digit number as shown in the trouble code charts.
  10.  

Code 12 is 1 flash, a short pause and 2 flashes. This code means the self-diagnosis system is working properly.

  1. If 2 or more areas are involved and that many codes are to be indicated, the CHECK ENGINE light indicates each code corresponding to the area of trouble 3 times in the increasing order of the code numbers and then repeats them.
  2.  


NOTE
Always write down the codes as they are flashing. This memory will be lost when the power to the control unit (ECM) is disconnected.



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Fig. ECM connector diagram 1988 and 1991 P'up and Amigo with EFI



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Fig. ECM connector identification 1988 P'up and Amigo with carburetor



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Fig. ECM connector identification 1989 P'up and Amigo with carburetor



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Fig. Trouble code identification part 1 1988 and 1991 P'up and Amigo with carburetor



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Fig. Trouble code identification part 2 1988 and 1991 P'up and Amigo with carburetor



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Fig. Trouble code identification part 1 1988 and 1991 P'up and Amigo with EFI



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Fig. Trouble code identification part 2 1988 and 1991 P'up and Amigo with EFI



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Fig. Trouble code identification part 3 1988 and 1991 P'up and Amigo with EFI



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Fig. System performance check 1988 and 1991 P'up and Amigo with carburetor



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Fig. Chart 1 illustration, no CHECK ENGINE light 1988 and 1991 P'up and Amigo with EFI



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Fig. Chart 1, no CHECK ENGINE light 1988 and 1991 P'up and Amigo with EFI



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Fig. Chart 1, dwell fixed under 10and#x00B0; 1988 and 1991 P'up and Amigo with carburetor



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Fig. Chart 2, will not flash code 12, light on steady 1988 and 1991 P'up and Amigo with EFI



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Fig. Chart 2, dwell fixed between 10 and 1980and#x00B0; 1988 and 1991 P'up and Amigo with carburetor



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Fig. Chart 3, dwell fixed over 80and#x00B0; 1988 and 1991 P'up and Amigo with carburetor



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Fig. Chart 4, idle switch and WOT switch circuit check 1988 and 1991 P'up and Amigo with carburetor



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Fig. Chart 4, Idle switch and MAP sensor circuit 1988 and 1991 P'up and Amigo with carburetor



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Fig. Chart 5, CHECK ENGINE light inoperative 1988 and 1991 P'up and Amigo with carburetor



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Fig. Chart 6, will not flash code 12, check ECM fuse first 1988 and 1991 P'up and Amigo with carburetor



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Fig. Trouble code 12, no reference pulses to the ECM 1988 and 1991 P'up and Amigo with carburetor



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Fig. Trouble code 13, open oxygen sensor circuit 1988 and 1991 P'up and Amigo with carburetor



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Fig. Trouble code 13, 44 and 45, no or abnormal signal from the oxygen sensor 1988 and 1991 P'up and Amigo with EFI



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Fig. Trouble code 14, shorted coolant temperature sensor 1988 and 1991 P'up and Amigo with carburetor



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Fig. Trouble code 15, open coolant temperature sensor 1988 and 1991 P'up and Amigo with carburetor



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Fig. Trouble code 21, idle switch circuit open or WOT switch shorted 1988 P'up and Amigo with carburetor



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Fig. Trouble code 21, idle switch or MAP sensor failure 1989 P'up and Amigo with carburetor



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Fig. Trouble code 21, illustration 1988 and 1991 P'up and Amigo with carburetor



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Fig. Trouble code 22, fuel cut solenoid circuit failure 1988 and 1991 P'up and Amigo with carburetor



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Fig. Trouble code 23, duty solenoid failure 1988 and 1991 P'up and Amigo with carburetor



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Fig. Trouble code 25, air VSV circuit failure 1988 and 1991 P'up and Amigo with carburetor



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Fig. Trouble code 44 and 45, fuel metering failure 1988 and 1991 P'up and Amigo with EFI



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Fig. Trouble code 14 and 15 part 1, abnormal coolant temperature sensor signal 1988 and 1991 P'up and Amigo with EFI



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Fig. Trouble code 15 part 2 1988 and 1991 P'up and Amigo with EFI



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Fig. Trouble code 21, throttle valve switch 1988 and 1991 P'up and Amigo with EFI



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Fig. Trouble code 43 and 65, throttle valve switch 1988 and 1991 P'up and Amigo with EFI



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Fig. Trouble code 22, no starter signal 1988 and 1991 P'up and Amigo with EFI



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Fig. Trouble code 26 and 27, VSV canister purge solenoid 1988 and 1991 P'up and Amigo with carburetor



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Fig. Trouble code 31, no reference signal 1988 and 1991 P'up and Amigo with carburetor



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Fig. Trouble code 32, EGR system failure 1988 and 1991 P'up and Amigo with carburetor



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Fig. Trouble code 34 part 1, EGR temperature sensor 1988 and 1991 P'up and Amigo with carburetor



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Fig. Trouble code 34 part 2, EGR temperature sensor 1988 and 1991 P'up and Amigo with carburetor



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Fig. Trouble code 41, crank angle sensor 1988 and 1991 P'up and Amigo with EFI



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Fig. Trouble code 44, oxygen sensor, lean 1988 and 1991 P'up and Amigo with carburetor



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Fig. Trouble code 45, oxygen sensor, rich 1988 and 1991 P'up and Amigo with carburetor



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Fig. Trouble code 52, RAM problem 1988 and 1991 P'up and Amigo with carburetor



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Fig. Trouble code 55, A/D converter problem 1988 and 1991 P'up and Amigo with carburetor



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Fig. Trouble code 61 and 62, part 1, air flow sensor 1988 and 1991 P'up and Amigo with EFI



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Fig. Trouble code 61 and 62, part 2, air flow sensor 1988 and 1991 P'up and Amigo with EFI



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Fig. Trouble code 63, vehicle speed sensor 1988 and 1991 P'up and Amigo with EFI



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Fig. Trouble code 51 and 52, ROM and RAM problem 1988 and 1991 P'up and Amigo with EFI



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Fig. Trouble code 64, fuel injector error 1988 and 1991 P'up and Amigo with EFI



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Fig. Air management check 1988 and 1991 P'up and Amigo with carburetor

CLEARING TROUBLE CODES

The code will be stored until the power from the battery to the control unit is cut off. After correcting the problem, erase the memory by removing the ECM fuse or disconnecting the negative battery cable for more than 20 seconds. Disconnecting the battery cable will cancel clock, radio and any other memory functions.


NOTE
Some vehicle computers have a learning ability. If a change is noted in vehicle performance after clearing codes, it may be due to the computers learning ability. To restore performance, warm vehicle to normal operating temperature and drive at part throttle with moderate acceleration, before performing any additional diagnosis.

1985 and 1990 FWD I-Mark

The ECM (electronic control module) system features a self-diagnosis function. The self-diagnosis function identifies troubles in the area related to the sensors, including wiring harnesses and ECM.

If a malfunction exists in the input signal to the ECM as a result of some trouble in the emission related components, the CHECK ENGINE light on the instrument panel will turn ON or flash to inform a presence of trouble. The system diagnosis should be performed in the following sequence:

If a failure has developed in one of the system sensors, driveability or safety may be adversely affected. To give an extra margin of safety in the event of system failure, the output of the control unit will be switched automatically to the fail-safe mode.

  1. Diagnostic circuit check
  2.  
  3. Driver Complaint
  4.  
  5. System Performance Check
  6.  

ENTERING SELF-DIAGNOSTIC SYSTEM
  1. With the ignition switch ON and engine not running, the light turns ON to indicate the circuit is in good condition. The light will turn OFF when the engine is started.
  2.  
  3. If the light stays ON after the engine is started, a malfunction exists in the signal to the control unit (ECM). The control unit will store a malfunction even if it an intermittent one. A poor contact may cause the light to come ON and then turn OFF when the circuit is completed, but the code will be stored even with the light OFF.
  4.  
  5. To diagnose a problem, connect both diagnostic terminals A and C of the ALDL located under the instrument panel next to the right hand pick panel. With the engine not running, the CHECK ENGINE light will flash a code 12 to indicate the system is in the diagnostic mode. This code will repeat three times. When the engine is started and the light stays ON, the diagnostic system has detected a fault.
  6.  
  7. In most cases, codes will be checked with the engine running since no codes other than code 12 and 51 will be present on initial key ON. Remove the ground terminal from the ALDL before starting the engine.
  8.  
  9. The codes consist of flashes and pauses to indicate trouble codes. Each component has a code designation. The code represents a 2 digit number as shown in the trouble code charts.
  10.  

Code 12 is 1 flash, a short pause and 2 flashes. This code means the self-diagnosis system is working properly.

  1. If 2 or more areas are involved and that many codes are to be indicated, the CHECK ENGINE light indicates each code corresponding to the area of trouble 3 times in the increasing order of the code numbers and then repeats them.
  2.  


NOTE
Always write down the codes as they are flashing. This memory will be lost when the power to the control unit (ECM) is disconnected.



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Fig. Trouble code chart FWD I-Mark



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Fig. ECM wiring diagram part 1 FWD I-Mark



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Fig. ECM wiring diagram part 2 FWD I-Mark



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Fig. Trouble code 13, oxygen sensor circuit open FWD I-Mark



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Fig. Trouble code 14, coolant sensor circuit shorted FWD I-Mark



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Fig. Trouble code 15, coolant sensor circuit open FWD I-Mark



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Fig. Trouble code 21, throttle position sensor voltage high FWD I-Mark



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Fig. Trouble code 22, throttle position sensor voltage low FWD I-Mark



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Fig. Trouble code 23, Manifold Air Temperature (MAT) sensor voltage high FWD I-Mark



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Fig. Trouble code 24, vehicle speed sensor FWD I-Mark



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Fig. Trouble code 25, manifold air temperature sensor voltage low FWD I-Mark



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Fig. Trouble code 31, turbocharger wastegate control failure (over boost) FWD I-Mark



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Fig. Trouble code 32, EGR system control failure FWD I-Mark



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Fig. Trouble code 33, MAP sensor voltage high FWD I-Mark



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Fig. Trouble code 34, MAP sensor voltage low FWD I-Mark



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Fig. Trouble code 42, electronic spark timing FWD I-Mark



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Fig. Trouble code 43, electronic spark control (knock sensor failure) FWD I-Mark



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Fig. Trouble code 44, lean exhaust indication FWD I-Mark



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Fig. Trouble code 45, rich exhaust indication FWD I-Mark



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Fig. Trouble code 51, MEM-CAL failure FWD I-Mark



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Fig. Idle Air Control (IAC) valve chart FWD I-Mark

CLEARING TROUBLE CODES

The code will be stored until the power from the battery to the control unit is cut off. After correcting the problem, erase the memory by removing the ECM fuse or disconnecting the negative battery cable for more than 20 seconds. Disconnecting the battery cable will cancel clock, radio and any other memory functions.


NOTE
Some vehicle computers have a learning ability. If a change is noted in vehicle performance after clearing codes, it may be due to the computers learning ability. To restore performance, warm vehicle to normal operating temperature and drive at part throttle with moderate acceleration, before performing any additional diagnosis.

RWD Impulse

The ECM (electronic control module) system features a self-diagnosis function. The self-diagnosis function identifies troubles in the area related to the sensors, including wiring harnesses and ECM.

If a malfunction exists in the input signal to the ECM as a result of some trouble in the emission related components, the CHECK ENGINE light on the instrument panel will turn ON or flash to inform a presence of trouble. The system diagnosis should be performed in the following sequence:

If a failure has developed in one of the system sensors, driveability or safety may be adversely affected. To give an extra margin of safety in the event of system failure, the output of the control unit will be switched automatically to the fail-safe mode.

  1. Diagnostic circuit check
  2.  
  3. Driver Complaint
  4.  
  5. System Performance Check
  6.  

ENTERING SELF-DIAGNOSTIC SYSTEM
  1. With the ignition switch ON and engine not running, the light turns ON to indicate the circuit is in good condition. The light will turn OFF when the engine is started.
  2.  
  3. If the light stays ON after the engine is started, a malfunction exists in the signal to the control unit (ECM). The control unit will store a malfunction even if it an intermittent one. A poor contact may cause the light to come ON and then turn OFF when the circuit is completed, but the code will be stored even with the light OFF.
  4.  
  5. To diagnose a problem, connect both diagnostic terminals of the ALDL located under the instrument panel next to the steering column. With the engine not running, the CHECK ENGINE light will flash a code 12 to indicate the system is in the diagnostic mode. This code will repeat three times. When the engine is started and the light stays ON, the diagnostic system has detected a fault.
  6.  
  7. The codes consist of flashes and pauses to indicate trouble codes. Each component has a code designation. The code represents a 2 digit number as shown in the trouble code charts.
  8.  

Code 12 is 1 flash, a short pause and 2 flashes. This code means the self-diagnosis system is working properly.

  1. If 2 or more areas are involved and that many codes are to be indicated, the CHECK ENGINE light indicates each code corresponding to the area of trouble 3 times in the increasing order of the code numbers and then repeats them.
  2.  


NOTE
Always write down the codes as they are flashing. This memory will be lost when the power to the control unit (ECM) is disconnected.



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Fig. ALDL diagnostic link terminal RWD Impulse



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Fig. Clearing memory codes RWD Impulse



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Fig. ECM harness connector RWD Impulse



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Fig. Trouble code chart part 1 RWD Impulse



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Fig. Trouble code chart part 2 RWD Impulse



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Fig. Trouble code chart part 3 RWD Impulse



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Fig. Trouble code 12 RWD Impulse



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Fig. Trouble code 13 RWD Impulse



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Fig. Trouble code 44 and 45 RWD Impulse



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Fig. Trouble code 15 RWD Impulse



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Fig. Trouble code 15 and 16 RWD Impulse



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Fig. Trouble code 21 RWD Impulse



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Fig. Trouble code 43 and 65 RWD Impulse



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Fig. Trouble code 22 RWD Impulse



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Fig. Trouble code 41 RWD Impulse



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Fig. Trouble code 61 and 62 RWD Impulse



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Fig. Trouble code 63 RWD Impulse



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Fig. Trouble code 66 RWD Impulse



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Fig. Trouble code 51 and 52 RWD Impulse



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Fig. Trouble code 23, 35 and 54 RWD Impulse



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Fig. Trouble code 25 and 53 RWD Impulse



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Fig. Trouble code 26 and 27 RWD Impulse



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Fig. Trouble code 33 RWD Impulse



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Fig. Trouble code 64 RWD Impulse



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Fig. Trouble code 71 RWD Impulse



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Fig. Trouble code 72 and 73 RWD Impulse



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Fig. Trouble code 32 RWD Impulse



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Fig. Trouble code 34 RWD Impulse

CLEARING TROUBLE CODES

The code will be stored until the power from the battery to the control unit is cut off. After correcting the problem, erase the memory by removing the ECM fuse (No. 4) or disconnecting the negative battery cable for more than 20 seconds. Disconnecting the battery cable will cancel clock, radio and any other memory functions.


NOTE
Some vehicle computers have a learning ability. If a change is noted in vehicle performance after clearing codes, it may be due to the computers learning ability. To restore performance, warm vehicle to normal operating temperature and drive at part throttle with moderate acceleration, before performing any additional diagnosis.

FWD Impulse and Stylus

NOTE
The Impulse with automatic transaxle has a separate transaxle ECM to control the transmission sensors. Refer to the end of this section for information and charts.

The ECM (electronic control module) system features a self-diagnosis function. The self-diagnosis function identifies troubles in the area related to the sensors, including wiring harnesses and ECM.

If a malfunction exists in the input signal to the ECM as a result of some trouble in the emission related components, the CHECK ENGINE light on the instrument panel will turn ON or flash to inform a presence of trouble. The system diagnosis should be performed in the following sequence:

If a failure has developed in one of the system sensors, driveability or safety may be adversely affected. To give an extra margin of safety in the event of system failure, the output of the ECM will be switched automatically to the fail-safe mode. The ECM takes over the failed system and keeps vehicle performance constant.

  1. Diagnostic circuit check
  2.  
  3. Driver Complaint
  4.  
  5. System Performance Check
  6.  

ENTERING SELF-DIAGNOSTIC SYSTEM
  1. With the ignition switch ON and engine not running, the light turns ON to indicate the circuit is in good condition. The light will turn OFF when the engine is started.
  2.  
  3. If the light stays ON after the engine is started, a malfunction exists in the signal to the control unit (ECM). The control unit will store a malfunction even if it an intermittent one. A poor contact may cause the light to come ON and then turn OFF when the circuit is completed, but the code will be stored even with the light OFF.
  4.  
  5. To diagnose a problem, connect 1 and 3 terminals of the ALDL with a jumper wire. The ALDL is located under the instrument panel behind the right kick panel. With the engine not running, the CHECK ENGINE light will flash a code 12 to indicate the system is in the diagnostic mode. This code will repeat three times. When the engine is started and the light stays ON, the diagnostic system has detected a fault.
  6.  
  7. The codes consist of flashes and pauses to indicate trouble codes. Each component has a code designation. The code represents a 2 digit number as shown in the trouble code charts.
  8.  

Code 12 is 1 flash, a short pause and 2 flashes. This code means the self-diagnosis system is working properly.

  1. If 2 or more areas are involved and that many codes are to be indicated, the CHECK ENGINE light indicates each code corresponding to the area of trouble 3 times in the increasing order of the code numbers and then repeats them.
  2.  


NOTE
Always write down the codes as they are flashing. This memory will be lost when the power to the control unit (ECM) is disconnected.



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Fig. Assembly Line Diagnostic Link (ALDL) FWD Impulse and Stylus



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Fig. Component location FWD Impulse and Stylus DOHC



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Fig. Component location SOHC Stylus



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Fig. Component location DOHC Turbo Impulse



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Fig. ECM wiring diagram part 1 FWD Impulse and Stylus DOHC



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Fig. ECM wiring diagram part 2 FWD Impulse and Stylus DOHC



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Fig. ECM wiring diagram part 3 FWD Impulse and Stylus DOHC



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Fig. ECM wiring diagram part 1 Stylus SOHC



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Fig. ECM wiring diagram part 2 Stylus SOHC



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Fig. ECM wiring connectors FWD Impulse and Stylus DOHC



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Fig. ECM wiring diagram part 3 Stylus SOHC



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Fig. ECM wiring connector Stylus SOHC



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Fig. ECM wiring diagram part 1 FWD Impulse DOHC Turbo



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Fig. ECM wiring diagram part 2 FWD Impulse DOHC Turbo



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Fig. ECM wiring diagram part 3 FWD Impulse DOHC Turbo



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Fig. ECM wiring connector FWD Impulse DOHC Turbo

CLEARING TROUBLE CODES

The code will be stored until the power from the battery to the ECM is cut off. After correcting the problem, turn the ignition key OFF and erase the memory by removing the ECM fuse, ECM pigtail or disconnecting the negative battery cable for more than 20 seconds. Disconnecting the battery cable will cancel clock, radio and any other memory functions.


NOTE
Some vehicle computers have a learning ability. If a change is noted in vehicle performance after clearing codes, it may be due to the computers learning ability. To restore performance, warm vehicle to normal operating temperature and drive at part throttle with moderate acceleration, before performing any additional diagnosis.

FWD Impulse with Automatic Transaxle

The ECM is located behind the right kick pad. It controls the shifting of the four speed automatic transaxle through the use of solenoids and sensors. If a malfunction occurs during the operation of the transaxle, the ECONOMY light located in the instrument panel will blink. The ECM will store the malfunction in its memory. The transaxle can operate in the normal, manual or economy mode. The difference between these modes are the shift points.

ENTERING SELF DIAGNOSTIC SYSTEM

A five cavity diagnostic connector for the transaxle ECM is located at the passenger pick panel and is GREEN in color. The ECM will display codes when cavities 1 and 2 are jumpered with a wire and the ignition switch in the ON position.

After grounding the diagnostic connector, the ECONOMY light will flicker if there is no malfunction codes stored. If a code exists, the light will flash the code in the same fashion as the engine codes.



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Fig. Transaxle diagnostic link FWD Impulse with auto trans.



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Fig. Diagnostic trouble codes FWD Impulse with auto trans.



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Fig. Transaxle components location FWD Impulse with auto trans.



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Fig. ECM wiring diagram part 1 FWD Impulse with auto trans.



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Fig. ECM wiring diagram part 2 FWD Impulse with auto trans.



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Fig. ECM wiring diagram part 3 FWD Impulse with auto trans.



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Fig. ECM connector identification FWD Impulse with auto trans.

1986 and 1987 Trooper, Carbureted (California)

The ECM (electronic control module) system features a self-diagnosis function. The self-diagnosis function identifies troubles in the area related to the sensors, including wiring harnesses and ECM.

If a malfunction exists in the input signal to the ECM as a result of some trouble in the emission related components, the CHECK ENGINE light on the instrument panel will turn ON or flash to inform a presence of trouble. The system diagnosis should be performed in the following sequence:

If a failure has developed in one of the system sensors, driveability or safety may be adversely affected. To give an extra margin of safety in the event of system failure, the output of the ECM will be switched automatically to the fail-safe mode. The ECM takes over the failed system and keeps vehicle performance constant.

  1. Diagnostic circuit check
  2.  
  3. Driver Complaint
  4.  
  5. System Performance Check
  6.  

ENTERING SELF-DIAGNOSTIC SYSTEM
  1. With the ignition switch ON and engine not running, the light turns ON to indicate the circuit is in good condition. The light will turn OFF when the engine is started.
  2.  
  3. If the light stays ON after the engine is started, a malfunction exists in the signal to the control unit (ECM). The control unit will store a malfunction even if it an intermittent one. A poor contact may cause the light to come ON and then turn OFF when the circuit is completed, but the code will be stored even with the light OFF.
  4.  
  5. To diagnose a problem, connect the white and black terminals together. The ALDL is located behind the instrument panel under the cigar lighter. With the engine not running, the CHECK ENGINE light will flash a code 12 to indicate the system is in the diagnostic mode. This code will repeat three times. When the engine is started and the light stays ON, the diagnostic system has detected a fault.
  6.  
  7. The codes consist of flashes and pauses to indicate trouble codes. Each component has a code designation. The code represents a 2 digit number as shown in the trouble code charts.
  8.  

Code 12 is 1 flash, a short pause and 2 flashes. This code means the self-diagnosis system is working properly.

  1. If 2 or more areas are involved and that many codes are to be indicated, the CHECK ENGINE light indicates each code corresponding to the area of trouble 3 times in the increasing order of the code numbers and then repeats them.
  2.  
  3. Faults indicated by trouble codes 13, 15, 31, 44 and 45 requires engine operation at part throttle for up to five minutes after engine warm-up before the CHECK ENGINE light will come on and store a trouble code.
  4.  


NOTE
Always write down the codes as they are flashing. This memory will be lost when the power to the control unit (ECM) is disconnected.



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Fig. Emission control wiring diagram 1986 and 1987 Trooper (California) with carburetor



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Fig. Assembly Line Diagnostic Link (ALDL) location 1986 and 1987 Trooper (California) with carburetor



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Fig. ECM connector identification 1986 and 1987 Trooper (California) with carburetor



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Fig. Trouble code identification 1986 and 1987 Trooper (California) with carburetor



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Fig. Diagnostic circuit check 1986 and 1987 Trooper (California) with carburetor



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Fig. System performance check 1986 and 1987 Trooper (California) with carburetor



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Fig. Chart 1, dwell fixed under 10and#x00B0; 1986 and 1987 Trooper (California) with carburetor



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Fig. Chart 2, dwell fixed between 10 and 1980and#x00B0; 1986 and 1987 Trooper (California) with carburetor



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Fig. Chart 3, dwell fixed over 80and#x00B0; 1986 and 1987 Trooper (California) with carburetor



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Fig. Chart 4, idle switch and WOT switch circuit test 1986 and 1987 Trooper (California) with carburetor



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Fig. Chart 5, CHECK ENGINE light inoperative 1986 and 1987 Trooper (California) with carburetor



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Fig. Chart 6, will not flash code 12 1986 and 1987 Trooper (California) with carburetor



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Fig. Trouble code 12, no reference pulses to the ECM 1986 and 1987 Trooper (California) with carburetor



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Fig. Trouble code 13, open oxygen sensor circuit 1986 and 1987 Trooper (California) with carburetor



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Fig. Trouble code 14, shorted coolant sensor circuit 1986 and 1987 Trooper (California) with carburetor



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Fig. Trouble code 15, open coolant sensor circuit 1986 and 1987 Trooper (California) with carburetor



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Fig. Trouble code 21, idle switch circuit open or WOT switch shorted 1986 and 1987 Trooper (California) with carburetor



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Fig. Trouble code 22, fuel cut solenoid circuit open or grounded 1986 and 1987 Trooper (California) with carburetor



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Fig. Trouble code 23, mixture control 1986 and 1987 Trooper (California) with carburetor



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Fig. Trouble code 25, vacuum switching solenoid 1986 and 1987 Trooper (California) with carburetor



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Fig. Trouble code 31, no reference signal 1986 and 1987 Trooper (California) with carburetor



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Fig. Trouble code 44, oxygen sensor, lean 1986 and 1987 Trooper (California) with carburetor



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Fig. Trouble code 45, oxygen sensor, rich 1986 and 1987 Trooper (California) with carburetor



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Fig. Trouble code 51, constant high voltage from fuel cut solenoid to ECM 1986 and 1987 Trooper (California) with carburetor



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Fig. Trouble code 52, RAM trouble 1986 and 1987 Trooper (California) with carburetor



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Fig. Trouble code 53, constant high voltage from air switching solenoid to ECM 1986 and 1987 Trooper (California) with carburetor



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Fig. Trouble code 54, constant high voltage from carburetor mixture control solenoid to ECM 1986 and 1987 Trooper (California) with carburetor



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Fig. Trouble code 55, A/D converter problem 1986 and 1987 Trooper (California) with carburetor



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Fig. Air management check 1986 and 1987 Trooper (California) with carburetor

CLEARING TROUBLE CODES

The code will be stored until the power from the battery to the ECM is cut off. After correcting the problem, turn the ignition key OFF and erase the memory by removing the ECM fuse or disconnecting the negative battery cable for more than 20 seconds. Disconnecting the battery cable will cancel clock, radio and any other memory functions.


NOTE
Some vehicle computers have a learning ability. If a change is noted in vehicle performance after clearing codes, it may be due to the computers learning ability. To restore performance, warm vehicle to normal operating temperature and drive at part throttle with moderate acceleration, before performing any additional diagnosis.

1988 and 1991 Trooper and Rodeo

The ECM (electronic control module) system features a self-diagnosis function. The self-diagnosis function identifies troubles in the area related to the sensors, including wiring harnesses and ECM.

If a malfunction exists in the input signal to the ECM as a result of some trouble in the emission related components, the CHECK ENGINE light on the instrument panel will turn ON or flash to inform a presence of trouble. The system diagnosis should be performed in the following sequence:

If a failure has developed in one of the system sensors, driveability or safety may be adversely affected. To give an extra margin of safety in the event of system failure, the output of the ECM will be switched automatically to the fail-safe mode. The ECM takes over the failed system and keeps vehicle performance constant.

  1. Diagnostic circuit check
  2.  
  3. Driver Complaint
  4.  
  5. System Performance Check
  6.  

ENTERING SELF-DIAGNOSTIC SYSTEM
  1. With the ignition switch ON and engine not running, the light turns ON to indicate the circuit is in good condition. The light will turn OFF when the engine is started.
  2.  
  3. If the light stays ON after the engine is started, a malfunction exists in the signal to the control unit (ECM). The control unit will store a malfunction even if it an intermittent one. A poor contact may cause the light to come ON and then turn OFF when the circuit is completed, but the code will be stored even with the light OFF.
  4.  
  5. To diagnose a problem, connect the diagnostic terminals together. The ALDL is located behind the instrument panel under the left pick panel for the Rodeo and under the center console for the Trooper. With the engine not running, the CHECK ENGINE light will flash a code 12 to indicate the system is in the diagnostic mode. This code will repeat three times. When the engine is started and the light stays ON, the diagnostic system has detected a fault.
  6.  



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Fig. Assembly Line Diagnostic Link (ALDL) Rodeo



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Fig. Assembly Line Diagnostic Link (ALDL) 1988 and 1991 Trooper



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Fig. ECM connector identification 4ZE1 engine



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Fig. ECM wiring diagram 2.8L Trooper



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Fig. ECM connector identification 2.8L Trooper



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Fig. ECM wiring diagram part 1 3.1L Rodeo



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Fig. ECM connector identification 3.1L Rodeo

  1. The codes consist of flashes and pauses to indicate trouble codes. Each component has a code designation. The code represents a 2 digit number as shown in the trouble code charts.
  2.  

Code 12 is 1 flash, a short pause and 2 flashes. This code means the self-diagnosis system is working properly.

  1. If 2 or more areas are involved and that many codes are to be indicated, the CHECK ENGINE light indicates each code corresponding to the area of trouble 3 times in the increasing order of the code numbers and then repeats them.
  2.  


NOTE
Always write down the codes as they are flashing. This memory will be lost when the power to the control unit (ECM) is disconnected.



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Fig. Trouble code identification part 1 4ZE1 engine



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Fig. Trouble code identification part 2 4ZE1 engine



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Fig. Trouble code identification part 3 4ZE1 engine



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Fig. Diagnostic circuit check 4ZE1 engine



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Fig. Diagnostic circuit check V6 engine



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Fig. Diagnostic circuit check illustration 4ZE1 engine



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Fig. Chart 1, no CHECK ENGINE light 4ZE1 engine



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Fig. Chart A1, no CHECK ENGINE light 2.8L Trooper



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Fig. Chart A1, no CHECK ENGINE light 3.1L Rodeo



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Fig. Chart 2, will not flash code 12 4ZE1 engine



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Fig. Chart A2, no ALDL data or will not flash code 12 2.8L Trooper



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Fig. Chart A2, no ALDL data or will not flash code 12 3.1L Rodeo



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Fig. Chart A3 part 1, engine cranks but will not start 2.8L Trooper



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Fig. Chart A3 part 2, engine cranks but will not start 2.8L Trooper



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Fig. Chart A3 part 1, engine cranks but will not start 3.1L Rodeo



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Fig. Chart A3 part 2, engine cranks but will not start 3.1L Rodeo



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Fig. Chart A7 part 1, fuel system diagnosis 2.8L Trooper



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Fig. Chart A7 part 2, fuel system diagnosis 2.8L Trooper



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Fig. Chart A7 part 1, fuel system diagnosis 3.1L Rodeo



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Fig. Chart A7 part 2, fuel system diagnosis 3.1L Rodeo and Trouble code 12 4ZE1 engine



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Fig. Trouble code 13, no signal from the oxygen sensor 4ZE1 engine



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Fig. Trouble code 13, oxygen sensor open 2.8L Trooper



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Fig. Trouble code 13, oxygen sensor open 3.1L Rodeo



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Fig. Trouble code 44 and 45 part 1, fuel metering faulty 4ZE1 engine



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Fig. Trouble code 44 and 45 part 2, fuel metering faulty 4ZE1 engine



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Fig. Trouble code 14, coolant temperature sensor, high 2.8L Trooper



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Fig. Trouble code 14, coolant temperature sensor, high 3.1L Rodeo



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Fig. Trouble code 14 and 15, coolant temperature sensor 4ZE1 engine



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Fig. Trouble code 15, coolant temperature sensor 4ZE1 engine



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Fig. Trouble code 15, coolant temperature sensor, low 2.8L Trooper



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Fig. Trouble code 15, coolant temperature sensor, low 3.1L Rodeo



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Fig. Trouble code 21, throttle valve switch 4ZE1 engine



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Fig. Trouble code 21, throttle position sensor, high 2.8L and 3.1L Trooper



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Fig. Trouble code 22, no signal from the starter 4ZE1 engine



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Fig. Trouble code 22, throttle position sensor 2.8L Trooper



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Fig. Trouble code 22, throttle position sensor 3.1L Rodeo



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Fig. Trouble code 43 and 65, throttle valve switch 4ZE1 engine



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Fig. Trouble code, throttle valve circuit inspection 4ZE1 engine



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Fig. Trouble code 24, vehicle speed sensor 2.8L Trooper



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Fig. Trouble code 24, vehicle speed sensor 3.1L Rodeo



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Fig. Trouble code 32, EGR system failure 2.8L Trooper



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Fig. Trouble code 32, EGR system failure 3.1L Rodeo



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Fig. Trouble code 33, Manifold Absolute Pressure (MAP) sensor, voltage high, vacuum low 2.8L Trooper



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Fig. Trouble code 33, Manifold Absolute Pressure (MAP) sensor, voltage high, vacuum low 3.1L Rodeo



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Fig. Trouble code 34, Manifold Absolute Pressure (MAP) sensor, voltage low, vacuum high 2.8L Trooper



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Fig. Trouble code 34, Manifold Absolute Pressure (MAP) sensor, voltage low, vacuum high 3.1L Rodeo



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Fig. Trouble code 41, crank angle sensor system harness open 4ZE1 engine



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Fig. Trouble code 42, electronic spark timing 2.8L Trooper



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Fig. Trouble code 42, electronic spark timing 3.1L Rodeo



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Fig. Trouble code 43, electronic spark control 2.8L Trooper



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Fig. Trouble code 43, electronic spark control 3.1L Rodeo



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Fig. Trouble code 44, oxygen sensor, lean 2.8L Trooper



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Fig. Trouble code 44, oxygen sensor, lean 3.1L Rodeo



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Fig. Trouble code 45, oxygen sensor, rich 2.8L and 3.1L engine



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Fig. Trouble code 54, fuel pump circuit, low voltage 2.8L Trooper



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Fig. Trouble code 54, fuel pump circuit, low voltage 3.1L Rodeo



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Fig. Trouble code 51, 52 and 55 V6 engines



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Fig. Trouble code 61 and 62 part 1, air flow sensor 4ZE1 engine



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Fig. Trouble code 61 and 62 part 2, air flow sensor 4ZE1 engine



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Fig. Trouble code 63, vehicle speed sensor, 4ZE1 engine



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Fig. Trouble code 51, 52, ROM and RAM problem 4ZE1 engine



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Fig. Trouble code 23, 35 and 54, power transistor problem 4ZE1 engine



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Fig. Trouble code 25 and 53, VSV faulty pressure regulator 4ZE1 engine



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Fig. Trouble code 26 and 27 part 1, canister VSV does not operated or operatesabnormally 4ZE1 engine



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Fig. Trouble code 26 and 27 part 2, canister VSV does not operated or operatesabnormally 4ZE1 engine



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Fig. Trouble code 33 part 1, fuel injector error 4ZE1 engine



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Fig. Trouble code 33 part 2, fuel injector error 4ZE1 engine



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Fig. Trouble code 64, fuel injector error 4ZE1 engine



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Fig. Trouble code 64 illustration 4ZE1 engine



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Fig. Trouble code 32 and 34 part 1, EGR and sensor and failure 4ZE1 engine



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Fig. Trouble code 32 and 34 part 2, EGR and sensor and failure 4ZE1 engine



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Fig. Trouble code 34 part 1 4ZE1 engine



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Fig. Trouble code 34 part 2 4ZE1 engine



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Fig. Trouble code 34 part 3 4ZE1 engine

CLEARING TROUBLE CODES

The code will be stored until the power from the battery to the ECM is cut off. After correcting the problem, turn the ignition key OFF and erase the memory by removing the ECM fuse or disconnecting the negative battery cable for more than 20 seconds. Disconnecting the battery cable will cancel clock, radio and any other memory functions.


NOTE
Some vehicle computers have a learning ability. If a change is noted in vehicle performance after clearing codes, it may be due to the computers learning ability. To restore performance, warm vehicle to normal operating temperature and drive at part throttle with moderate acceleration, before performing any additional diagnosis.

 
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