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Old 02-09-2009, 12:01 PM   #1
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check engine light on

my 94 wrangler has been running like shit, and the check engine light comes on and off. Need some ideas. I think it might have something to do with the exaust but not sure.
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Old 02-09-2009, 01:02 PM   #2
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Put the key in the ignition and turn the key to run (not start), then off, then run, then off, then run (that's 3 runs and 2 offs). Leave the key in the run position. The check engine light will turn on for a few seconds, then turn off, then (sometimes after 20-30 seconds) start flashing. The flashes are counting out 2-digit trouble codes. Fast flashes count up each digit, with a longer pause between digits. 55 indicates the end of all codes.


Code Description
11* No crank reference signal detected during engine cranking.
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 (atmosphereic) pressure reading at start-up
14** MAP sensor input below minimum acceptable voltage.
or
MAP sensor input above maximum acceptable voltage.
15** No vehicle distance (speed) sensor signal detected during road load conditions.
17* Engine coolant temperature remains below normal operating temperatures during vehicle travel (thermostat).
21** Neither rich nor lean condition detected from the oxygen sensor input.
or
Oxygen sensor input voltage maintained above the normal operating range.
22** Engine coolant temperature sensor input above maximum acceptable voltage.
or
Engine coolant temperature sensor input below minimum acceptable voltage.
23** Intake manifold air temperature sensor input above maximum acceptable voltage.
or
Intake manifold air temperature sensor input below minimum acceptable voltage.
24** Throttle position sensor input above maximum acceptable voltage.
or
Throttle position sensor input below minimum acceptable voltage.
25** A shorted condition detected in one or more of the idle air control motor circuits.
27* Injector #1 output driver does not respond properly to the control signal.
or
Injector #2 output driver does not respond properly to the control signal.
or
Injector #3 output driver does not respond properly to the control signal.
or
Injector #4 output driver does not respond properly to the control signal.
or
Injector #5 output driver does not respond properly to the control signal.
or
Injector #6 output driver does not respond properly to the control signal.
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.
or
Speed control switch input below the minimum acceptable voltage.
or
Speed control switch input above the maximum acceptable voltage.

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 or a problem exists in the PCM's battery temperature voltage 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. Also, no significant change detected in battery voltage during active test of generator output.
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.

* - Check engine lamp will not illuminate at all times if this code was recorded. Cycle ignition key as described and observe code flashed by check engine lamp.

** - Check engine lamp will illuminate during engine operation if this code was recorded.
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Old 02-09-2009, 03:50 PM   #3
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thanks i'll try that
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Old 02-09-2009, 06:12 PM   #4
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shouldn't this be a sticky
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Old 02-09-2009, 10:37 PM   #5
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wow i never knew that you could do all that
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Old 02-10-2009, 11:18 AM   #6
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what is it doing to make it run like shit...
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Old 02-10-2009, 07:20 PM   #7
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Never heard this before
will save lots of headaches
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Old 02-11-2009, 07:49 AM   #8
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right out of the chilton or haynes manual. Another tool you can use to double check sensors is this: sun*pro (this is the import version,you would need the domestic)
you can find them cheaper than this. I got mine at a autozone for like $39.00.
this way you can double check before you start spending money on parts that you might not need.
I am glad I could help.
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94' wrangler 4 cyl. 5 speed D30/8.8 ARB
82' scrambler 350 TBI/700r4 D30/Currie 9"
07' JK sahara
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Old 02-12-2009, 08:22 AM   #9
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"right out of the chilton or haynes manual" is that where you got the Code Description and how to turn your car to run 3 times and all? If yes what chapter or page? on a haynes
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Old 02-12-2009, 07:19 PM   #10
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Haynes manual, chapter 6. Emission control system. under "self diagnostic code's" procedure.
there are better manuals out there but I grabbed this one off ebay used for .99 a few years back.
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94' wrangler 4 cyl. 5 speed D30/8.8 ARB
82' scrambler 350 TBI/700r4 D30/Currie 9"
07' JK sahara
Whats the deal with the facebook crap?? ->->->->
Grown men should NOT be on Facebook.
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Old 02-14-2009, 12:07 PM   #11
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thanks, i still don't know what it is. I put new exaust on it yesyerday, and it still runs like shit, and it still comes on. I replaced a vacume elbow going to the motor to that was cracked and wasn't working right. But i still haven't figured it out. One more questions do the 94 yj's have computers in them, or no? If they do it would be easy to just hook it up to a computer and run an analasis right?
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Old 02-15-2009, 02:33 AM   #12
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Could be a bad fuel pump or somethin
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Old 02-15-2009, 10:22 AM   #13
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Well it doesnt have the autozone computer hook up...You have to get a different computer scanner...You are going to get the same codes by running the self diagnostic codes...But the scanner can tell you if there is something like oxygen in the exhaust being too low...
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Old 02-15-2009, 10:35 AM   #14
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Hope you guys do not have the type of idiots working at autozone like they do around here. They will know less than you do.
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94' wrangler 4 cyl. 5 speed D30/8.8 ARB
82' scrambler 350 TBI/700r4 D30/Currie 9"
07' JK sahara
Whats the deal with the facebook crap?? ->->->->
Grown men should NOT be on Facebook.
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Old 02-18-2009, 04:15 PM   #15
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i already replaced the temperature sensor, when i got it, so could it be some other sensor?
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Old 02-18-2009, 04:38 PM   #16
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open up your tb and check the iac valve on there and maybe clean that, also your injectors may be clogged. And check all your vacuum lines
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Old 02-18-2009, 09:57 PM   #17
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You could run a bottle of injector cleaner through it. Yes, I would double check your vacuum lines,and 90's for cracks.
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94' wrangler 4 cyl. 5 speed D30/8.8 ARB
82' scrambler 350 TBI/700r4 D30/Currie 9"
07' JK sahara
Whats the deal with the facebook crap?? ->->->->
Grown men should NOT be on Facebook.
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Old 02-18-2009, 10:46 PM   #18
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comps for them are like 400 bucks. if you think its something exhaust related try replacing your o2 sensor. my jeep has 150 thousand on it and mine just went bad. might be a good place to start
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Old 02-22-2009, 06:24 AM   #19
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I agree with the above replace the O2 Sensor - the TB Sensor is another good culprit. When was the last time the Fuel Filter was changed? My 95 145K on the clock -O2 Sensor went out at about 142K- replaced A-OK. It did not run bad though- just the annoying check engine light.
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Old 02-23-2009, 11:26 AM   #20
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Quote:
Originally Posted by scrambler1 View Post
hope you guys do not have the type of idiots working at autozone like they do around here. They will know less than you do.
+1000
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Old 03-01-2009, 12:13 PM   #21
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bump

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