Check engine light on then starts cutting out ???? - Jeep Wrangler Forum
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Old 02-28-2012, 09:28 PM   #1
Join Date: Dec 2011
Location: Southeast Oklahoma
Posts: 94
Check engine light on then starts cutting out ????

Ok should not be much but I'm short of daylight ,time and cash to work on it . Any ideas on the problem or a fix. 93 yj 4.0 5 speed manual 93k on it. Just started doing this yesterday morning after driving it all weekend without a problem. It would not start then when I let it set a minute it started but the check engine light came on and it would cut out when you give it the gas????

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Old 02-29-2012, 05:21 PM   #2
Join Date: Feb 2012
Posts: 19
well my 2.5 started fine , but would cut out when first aplying the throttle..check engine code told me it was the throttle posistion sensor.replaced it and it solved the problem. if you havent checked the code you turn the ignition on and off three times, on the third time leave it then will flash once then pause then twice..that stands for 12 ...the next series of codes will be why your chk engine light is on...whenn you get 5 flashes ..pause and 5 more thats 55 thats the end of the parts store if you dont have code book they will tell you what it is..hope that helps

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Old 02-29-2012, 08:18 PM   #3
Join Date: Dec 2011
Location: Southeast Oklahoma
Posts: 94
Thanks I will try that.
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Old 03-02-2012, 08:38 PM   #4
Join Date: Dec 2011
Location: Southeast Oklahoma
Posts: 94
Originally Posted by Jpnhunter View Post
Thanks I will try that.

Tried the trick got a 12 , 21 , 24 code. 12 is a indicater that the power has been disconnected in the last 50 starts (Offroad lights) 21 O2 sensor, 24 Throttle posioning sensor. Replaced the two sensors and it's running like a top.
The diagnostic trouble codes on all models can be extracted from the Powertrain Control Module (PCM) using a SCAN tool. On 1991 through 1995 models only, the PCM can be placed in the diagnostic mode and the trouble codes flashed on the Check Engine light.

Found these codes for my 93 yj jeep.

The PCM will illuminate the CHECK ENGINE light on the dash if it recognizes a fault in the system. The light will remain lit until the problem is repaired and the code cleared or the PCM does not detect any malfunction for several consecutive drive cycles.

To extract the diagnostic trouble codes, perform the following steps:
  • Without starting the engine, turn the ignition key ON, OFF, ON, OFF and ON. The CHECK ENGINE light on the dash will begin to flash.
  • If any trouble codes are stored in the PCM memory, the CHECK ENGINE light will flash the number of the first digit, pause and flash the number of the second digit. For example, Code 23, air temperature sensor circuit would be indicated by two flashes, pause three flashes. A long pause will appear between individual codes if more than one code is present. Carefully observe the flashes and record the exact code number(s) onto paper.
  • After the stored codes have been indicated (or if everything in the self diagnosis system is functioning properly), the CHECK ENGINE light will flash a Code 55.
  • If the ignition key is turned OFF during the code extraction process and possibly turned back ON, the self diagnostic system will automatically invalidate the procedure and must be restarted.
Code Probable Cause

11* Ignition
12* Direct battery input to PCM was disconnected within the last 50 key-on cycles.
13** Manifold Absolute Pressure (MAP) Sensor Vacuum
14** Manifold Absolute Pressure (MAP) Sensor Electrical
15** Distance sensor or circuit
17* Engine running too cool
21** Oxygen sensor or circuit
22** Coolant temperature sensor or circuit
23** MAT sensor or circuit
24** Throttle Position Sensor (TPS) sensor or circuit
25** Automatic Idle Speed (AIS) circuit
27* Fuel injector control
31* EVAP solenoid or circuit
33* Air conditioning clutch relay
41* Alternator field
42* Automatic shutdown relay
44* Battery temperature sensor
46** Battery over voltage
47** Battery under voltage
51** Oxygen sensor - lean condition
52** Oxygen sensor - rich condition
53* Internal engine controller fault
54* Distributor sync pickup
55* End of Code output
62* Emissions Maintenance Reminder (EMR) mileage accumulator
63* Controller failure EEPROM write denied
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Old 03-03-2012, 05:50 PM   #5
Join Date: Feb 2012
Posts: 19
amazing what the o2 and throttle position sensors will do when bad..thanks for getn all the codes too. goin to save them on the 12 code i was goin by what the fella at parts store said , but he did say that was for some vehicles could be same for jeep..glad it worked
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