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Check Engine Light - Difficulty: ◆◇◇◇ Easy
Unless you are lucky, you will see the "Check Engine" light (Malfunction Indicator Lamp) glowing on the instrument panel at least once during your TJ ownership. When this happens, you don't have to go to a shop to figure out what has gone wrong with the vehicle nor you need an OBD II (On Board Diagnostic) scanner!
No tools required.
2 minutes or less
1. Insert the Key and keep it at the off position shown in the picture.
2. Hold down the odometer button and keep it down.
3. Turn the key to the on position. DO NOT START the vehicle.
4. Turn the key to off position. Repeat the "on & off" cycle two more time. (You do total of 3 "on & off" cycle after holding down the odometer button) After the first cycle of the "on & off," you will see a code on the odometer.
5. This is the firmware version shown. Older TJs will blink the check engine light 'n' times and you count the number of the blinks and compare it to the chart below*. Newer TJs will display the actual 'p' code which you can use to google.
12 -Battery power to PCM was disconnected.
13- No variation in MAP from start to run sensor is detected. No
difference recognized between engine MAP reading and barometric
pressure reading at start- up.
14- MAP sensor input below or above acceptable voltage.
15- No vehicle
speed signal. No vehicle distance (speed) sensor signal detected during
road load conditions or shaft speed less than 60 rpm when speed above
17-Engine is cold too long. Engine coolant temperature remains below normal operating temperatures during vehicle travel (thermostat).
Sensor voltage not detected from the oxygen sensor input. Or 02 sensor input
voltage maintained above or below normal operating range.
22- Coolant sensor voltage. Sensor input above or below acceptable voltage.
23- Charge air temp. sensor. Sensor input above or below acceptable voltage.
24- TPS voltage sensor input above or below the minimum acceptable voltage. Or TPS signal does not correlate to MAP sensor.
25- AIS motor circuits. An open or shorted condition detected in one or
more of the IAC control circuits. Or target idle speed not met.
27- Injector # X control circuit Injector output driver does not respond properly to the control signal.
31- An open or shorted condition in Purge Solenoid circuit. Incorrect
vapour flow detected. Possible leak or blocked between solenoid and fuel tank.
33- A/C clutch relay circuit An open or shorted condition detected in the A/C clutch relay circuit.
34- S/C solenoid circuits An open or shorted condition detected in the
speed control vacuum or vent solenoid circuits. Voltage too high or
35- Radiator Fan Relay in open or shorted condition detected in the radiator fan relay circuit. ( 2.5L only ).
37- No speed difference detected at 3 to 4 shift or no lockup in
Problem with trans solenoid with wrong pressure or voltage. Speed to
trans ratio below minimum required. Park/Neutral switch stuck.
41- Alternator field circuit in open or shorted condition detected in the alternator field control circuit.
42- ASD ( auto shut down ) or fuel pump relay control circuit in open or
shorted condition detected. Or no voltage sensed at controllers. No
fuel sensor signal detected or changed over time at PCM.
43- Cylinder misfire detected.
44- Battery temperature voltage out of range ( too high or low ).
45-Trans temperature/ Governor pressure voltage out of range. Less than
1.55 or above 3.73volts for temperature and less than .1 or above 4.89
volts. Trans temp. to high or low. OD switch input too low for more
than 5 mins.
46-Charging system voltage high. Battery voltage sense input above target charging voltage during engine operation.
47-Charging system voltage low. Battery voltage sense input below target charging voltage during engine operation.
51-O2 signal below centre. Oxygen sensor signal indicates lean fuel/air ratio condition during engine operation.
52-O2 signal above centre. Oxygen sensor signal indicates rich fuel/air
ratio condition during engine operation or Adaptive memory at lean
53-Internal Controller failure in PCM. Internal Controller fault condition detected.
54-No Sync signal. No camshaft position signal detected during engine cranking.
62-Controller failure. EMR miles not stored.
63-Failure to write to EEPROM location by PCM.
72-Catalyst efficiency below required level.
76-Fuel pump resistor Open or shorted condition by-pass relay circuit detected in fuel pump by-pass relay circuit
77-Malfunction detected with power feed to speed control servo solenoid.
If you have any questions or recommendation, please let me know!
I tried my best to document as much as possible along with pictures. I hope you find them useful. However, do use the information provided here "as-is". DailyDrivenTJ.com or the author does not warrant or assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, or process disclosed. Use the information at your own risk.
I am assigning the difficulty of different write ups. ' Easy' means just that; if you can read and follow direction, that is pretty much all that is required. 'Medium' difficulty rates those jobs that requires some grunt work such as loosening stubborn bolts or nut. 'Hard' means a lot of grunt work and working with heavy parts that cannot be handled without a jack or a partner. 'Very Hard' describes a job that is impossible to do without a partner and a high powered air tools.
Source: 1997 Jeep Wrangler Factory Service Manual; Group 25, Emission Control Systems
Written by Michael on 2006.4.1.
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