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October 25, 2014, 06:46:31 PM


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Jeep OBD-I Specific Trouble Codes

This guide is for troubleshooting your Jeep OBD-I engine codes. Why pay a mechanic a few hundreds bucks when you can find out whats going on with your Jeep in a few minutes. Keep in mind this doesn't always resolve the problem but for the most part if you have an error code come up look on the chart below and it will tell you what error your OBD-II computer had. Often times simply replacing the sensor or selonoid will fix your problem. 

If you have a check engine light on then perform the following proceedure to get the error code(s) On the older Jeeps running an OBD-I system the method of retrieving codes is rather primative yet effective. Codes are displayed by the check engine light blinking. You'll have to count the blinks and write each number down. When the check engine light pauses thats a space and a new number sequence has started. 

For Example:
Blink Blink - pause - Blink Blink Blink = 23 (error code - Intake air temperature sensor input above or below acceptable voltage)

Keep in mind that the check engine light will continue to pause and spit out numbers until its done. If you have a few errors the light will continue to blink and pause the listed errors on the computer. I find its easiest to just write down all the numbers at once until the computer is done then figure out what you've got. Also I check them atleast two or three times to verify the readings.

The last code you will see to let you know the error codes are finished is a code 55 

Step 1: Cycle the ingition key on/off/on/off/on within five seconds. (stopping at the on position)

 


 



11 - No crank reference signal detected during engine cranking. Intermittent loss of either camshaft or crankshaft position sensor. CKP sensor target windows have too much variation. (CPS SENSOR)

12 - Direct battery input to PCM was disconnected within the last 50 Key-on cycles.

13 - No difference recognized between the engine MAP reading and the barometric (atmosphere) pressure reading from start-up.

14 - MAP sensor input above or below acceptable voltage. 5 volt output to MAP sensor open.

15 - No vehicle speed sensor signal detected during road load conditions.

17 - Engine did not reach operating temperature within acceptable limits. Engine does not reach 20º F. within 5 minutes with a vehicle speed signal.

21 - Upstream oxygen sensor response slower than minimum required switching frequency. Upstream oxygen sensor heating element circuit malfunction. Downstream oxygen sensor heating element circuit malfunction. Downstream oxygen sensor input voltage maintained above the normal operating range. Oxygen sensor voltage too low, tested after cold start. (Upstream or Downstream) Left oxygen sensor input voltage maintained above the normal operating temperature.

22 - Engine coolant temperature sensor above or below acceptable voltage.

23 - Intake air temperature sensor input above or below acceptable voltage.

24 - Throttle position sensor input above or below acceptable voltage. TPS signal does not correlate to MAP sensor.

25 - A shorted or open condition detected in one or more of the idle air control motor circuits. Actual idle speed does not equal target idle speed.

27 - Injector #3, and/or 4, and/or 5, and/or 6 output driver does not respond properly to the control signal.

31 - An open or shorted condition detected in the A/C clutch relay circuit. Insufficient or excessive vapor flow detected during evaporative emission system operation.

32 - An open or shorted condition detected in the EGR solenoid circuit. Possible air/fuel ratio imbalance not detected during diagnosis.

33 - An open or shorted condition detected in the duty cycle purge solenoid circuit. (air conditioning clutch relay)

34 - An open or shorted condition detected in the Speed Control vacuum or vent solenoid circuits. Speed control switch input below the minimum acceptable voltage.

35 - Fan control relay

37 - Relationship between engine speed and vehicle speed indicates no torque converter clutch engagement. Auto. only.

37 - An open or shorted condition detected in the torque converter part throttle unlock solenoid control circuit. (3 speed auto RH trans. Only). Incorrect input state detected for the Park/Neutral switch. Auto. only.

41 - An open or shorted condition in the generator field control circuit.

42 - An open or shorted condition detected in the auto shutdown relay circuit. An open condition detected in the ASD relay output circuit. An open or shorted condition detected in the fuel pump relay control circuit. An open circuit between PCM and fuel gauge sending unit. Circuit shorted to voltage between PCM and fuel gauge sending unit. No movement of fuel level sender detected.

43 - Peak primary circuit current not achieved with maximum dwell time.

43 - Misfire detected in one or more cylinders 1 thru 6. (4 and 6 cyls.)

44 - Battery temperature sensor in voltage above or below acceptable range.

45 - Overdrive solenoid - open or shorted condition detected in overdrive solenoid circuit.

46 - Battery voltage sense input above target charging voltage during engine operation. (voltage too high)

47 - Battery voltage sense input below target charging during engine operation. Also, no significant change detected in battery voltage during active test of generator output circuit. (voltage too low)

51 - A lean air/fuel mixture has been indicated by an abnormally rich correction factor. (O2 sensor)

52 - A rich air/fuel mixture has been indicated by an abnormally rich correction factor. (O2 sensor)

53 - PCM Internal fault condition detected.

54 - No camshaft signal detected during engine cranking.

55 - Completion of fault code display on Check Engine lamp.

62 - Emissions Maintenance Reminder (EMR) triggered by mileage accumulator

63 - Unsuccessful attempt to write to an EPROM location by the PCM..

64 - Catalyst efficiency below required level. (Same as code 72)

65 - Power steering high pressure seen at high speed. (2.5L only)

72 - Catalyst efficiency below required level. (Same as code 64)

76 - Fuel pump resistor bypass relay

77 - Malfunction detected with poser feed to speed control servo solenoids
.

Link to our Actron Error Code Scanner Review: Click Here
Link to our OBD-II Jeep Error Code ID Chart: Click Here


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