OBD I Fehlerliste

Diskutiere OBD I Fehlerliste im Technik allgemein Forum im Bereich Jeep Modelle & Technik; anbei die DTC: Diagnostic Trouble Codes - 1995 Jeep 11 IGN reference signal. 12 Battery input to PCM disconnected during last 50 key starts...
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anbei die DTC:

Diagnostic Trouble Codes - 1995 Jeep

11 IGN reference signal.

12 Battery input to PCM disconnected during last 50 key starts.

13 Fault in the map sensor pneumatic circuit.

14 Fault in the map sensor electrical circuit.

15 Fault in the vehicle speed sensor circuit.

17 Engine running too cool.

21 Problem in the oxygen feedback circuit.

22 Fault in the coolant temperature sensor circuit.

23 Air temperature sensor.

24 Intake air temp. sensor voltage high.

25 Fault in the IAC motor drive circuit.

27 Fault in injector driver interface circuit.

33 Fault in air conditioning cutout relay circuit.

34 S/C solenoid circuits.

35 Fault in fan relay circuit.

41 Fault in the charging system or no field current.

42 Fault in the ASD relay driver circuit.

44 Battery Temp Voltage.

46 Battery voltage is too high.

47 Battery voltage is too low.

51 Lean condition is indicated.

52 Rich condition is indicated.

53 Internal problem in module.

54 No cam position signal.

55 Completion of fault code display.

62 Unsuccessful attempt to update EMR mileage.

63 Unsuccessful attempt to write to an EEPROM location by the controller.


Intro and Notes

So, before outlining the proceedure (a.k.a. "key trick") to get the codes, a few things to note:

1) You may have to set the parking brake for the codes to show

2) On older models, the blink-spacing is not always perfectly uniform, so if you see 23 23, it's probably just a single 55 since codes are not repeated (55 is end of codes - it's normal)

3) On newer models with a digital odometer, the codes are usually displayed on the odometer rather than blinking the check engine light.

4) When the computer indicates major failure, it can activate "Limp In" mode, which guesses about data to compensate for sensor failure, allowing you to get the car to a mechanic. One major symptom of this is losing third and/or fourth gear on autos.

The "Key Tricks"

Older (OBDI) models - Start with the ignition off. Within five seconds, switch the key on, off, on, off, on. ("On" is NOT "Start" and "Off" is NOT "Lock"). The "check engine" light will flash. Count the flashes. Each code is a two digit code, so a (for example) 23 would be FLASH FLASH (pause) FLASH FLASH FLASH (long pause). It will never flash more than 9 times, so watch for those pauses!

Newer (OBDII) models - Put the key into the ignition, push down the odometer reset button, then turn the key to RUN with your finger on the button - and then release the button. The odometer will go through 1111111 through 999999, then display the car's serial number. It will then show the error codes (it might show them starting with P). If this method does not work, try the OBDI method.

Older Model Computer Codes (OBDI) - IMPORTANT! Codes may be different for newer vehicles starting circa 1996.

11 No ignition reference signal detected during cranking OR timing belt skipped one or more teeth; OR loss of either camshaft or crankshaft position sensor.

12 Battery or computer recently disconnected

13 MAP sensor or vacuum line may not be working

14 MAP sensor voltage below .16V or over 4.96V

15 No speed/distance sensor signal

16 Loss of battery voltage detected with engine running

17 Engine stays cool too long (bad thermostat or coolant sensor?)


17 (1985 turbo only): knock sensor circuit

21 Oxygen sensor signal doesn't change (stays at 4.3-4.5V). Probably bad oxygen sensor

22 Coolant sensor signal out of range - May have been disconnected to set timing

23 Incoming air temperature sensor may be bad

24 Throttle position sensor over 4.96V

25 Automatic Idle Speed (AIS) motor driver circuit shorted or target idle not reached

26 Peak injector circuit voltage has not been reached (need to check computer signals, voltage reg, injectors)

27 Injector circuit isn't switching when it's told to (TBI)

OR (MPI) injector circuit #1 not switching right

OR (turbo) injector circuit #2 not switching right

OR (all 1990-) injector output driver not responding

- check computer, connections

31 Bad evaporator purge solenoid circuit or driver

32 (1984 only) power loss/limited lamp or circuit


32 EGR gases not working (1988) - check vacuum, valve


32 (1990-92) computer didn't see change in air/'fuel ratio when EGR activated - check valve, vacuum lines, and EGR electrical

33 Air conditioning clutch relay circuit open or shorted (may be in the wide-open-throttle cutoff circuit or normal on early 80's models if you don't have air conditioning)

34 (1984-86) EGR solenoid circuit shorted or open


34 (1987-1991) speed control shorted or open

35 Cooling fan relay circuit open or shorted


35 idle switch motor fault - check connections

36 (turbo only) Wastegate control circuit open or shorted

37 Shift indicator light failure, 5-speed


part throttle lock/unlock solenoid driver circuit (87-89)


solenoid coil circuit (85-87 Turbo only)


Trans temperature sensor voltage low (1995 and on)

41 Alternator field control circuit open or shorted

42 Automatic shutdown relay circuit open or shorted


42 Fuel pump relay control circuit


42 Fuel level unit - no change over miles


42 Z1 voltage missing when autoshutdown circuit energized (The Z1 voltage is the voltage of the circuits fed by the autoshutdown relay. This typically includes fuel pump and switched-battery feed to the ignition coil)

43 Peak primary coil current not achieved with max dwell time


43 Cylinder misfire


43 Problem in power module to logic module interface

44 No FJ2 voltage present at logic board


44 Logic module self-diagnostics indicate problem


44 Battery temperature out of range

45 Turbo boost limit exceeded (engine was shut down by logic module)

46 Battery voltage too high during charging or charging system voltage too low

47 Battery voltage too low and alternator output too low

51 Oxygen sensor stuck at lean position (this may be tripped by a bad MAP sensor system causing a rich condition. If you get hot rough idle and stalling, especially on deceleration, accompanied by flooded engine and difficulty restarting, that can be a bad MAP sensor causing the O2 sensor to try to compensate. If you get poor cold driveability, stumbling and bucking, and acceptable warm driving with poor gas mileage (a drop of 10 mpg or more), that is usually the O2 sensor.


51 Internal logic module fault ('84 turbo only).

52 Oxygen sensor stuck at rich position


52 Internal logic module fault ('84 turbo only)

53 Logic module internal problem

54 No sync pickup signal during engine rotation (turbo only)


54 Internal logic module fault ('84 turbo only) - or camshaft sensor/distributor timing

55 End of codes

61 "Baro" sensor open or shorted

62 EMR mileage cannot be stored in EEPROM

62 PCM failure SRI mile not stored

63 Controller cannot write to EEPROM

64 Catalytic converter efficiency failure

65 Power steering switch failure

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OBD I Fehlerliste