Mechanics

Jeep Diagnostic Trouble Codes OBD1

When you see a check engine light blink or stay on steady while you drive it means the computer has stored a diagnostic trouble code or codes. These codes are meant to help define a particular problem is the engine or emissions system. Trouble codes are identified by a two digit code. To activate the code gathering sequence turn the ignition key on and off five time in rapid secession ending with the key in the "on" position. This will start the code gathering, by watching ht check engine light and counting the number of times it flashes. The first set of flashes will be the first digit of the trouble code. 

There will be a short pause and then start flashing again, count the number and that will be the second digit in the trouble code. For example if the first blink number is four and the second number blink is six the code number is 46. To start the code gathering over turn the the ignition key to the off position and wait 5 minutes and start over. When the code gathering has been completed the system will flash a number fifty five which means the code display has ended. To clear codes after the repairs have been performed remove the negative battery cable and with two minutes and reconnect.

Jeep Trouble Code Description

11 No crank reference signal

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 (atmospheric) pressure reading at start-up

14 MAP sensor below minimum acceptable voltage

15 No vehicle speed sensor signal detected

17 Engine coolant temperature below normal operating temperatures

21 Neither rich nor lean condition detected from the oxygen sensor

22 Engine coolant temperature sensor input above maximum acceptable voltage

23 Intake manifold air temperature sensor input above maximum acceptable voltage

24 Throttle position sensor input above maximum acceptable voltage

25 A short condition detected in the idle air control motor

27 Injector output driver does not respond properly to the control signal or injector

33 An open or shorted condition detected in the A/C clutch relay circuit

34 An open or shorted condition detected in the speed control vacuum or vent solenoid circuits

35 An open or shorted condition detected in the radiator fan relay circuit

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

42 An open or shorted condition detected in the auto shutdown relay circuit

44 An open or shorted condition exists in the engine coolant temperature sensor circuit

46 Battery voltage sense input above target charging voltage during engine operation

47 Battery voltage sense input below target charging voltage during engine operation

51 Oxygen sensor signal input indicates lean air/fuel ratio condition during engine operation

52 Oxygen sensor signal input indicates rich air/fuel ratio condition during engine operation

53 PCM internal fault condition detected

54 No fuel sync (camshaft signal) detected during engine cranking

55 Completion of diagnostic trouble code display on the malfunction indicator lamp (check engine lamp)

62 Unsuccessful attempt to update SRI (service reminder indicator) miles in the PCM EEPROM

63 Unsuccessful attempt to write to an EEPROM location by the PCM


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AUTHOR


Written by
Co-Founder and CEO of 2CarPros.com
35 years in the automotive repair field, ASE Master Technician, Advanced Electrical and Mechanical Theory.


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Article first published (Updated 2013-08-16)