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Discussion Starter · #1 ·
Ok so I took out the restriction tube off the air intake hose after the factory air box,then I disconnected the battery and let the + and - cable rest against each other to rest the computer for 24 hours+, two days after i connect them to go to work and no problem after 14 hr at work I start jeep and check engine light on any suggestions oh I also cleaned the throttle body when I did the air box mod? Ad help ?
 

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I had a friend with a 92 YJ tell me something along the lines of if you turn your key 3 times, the light will flash a certain number of times matching up with a chapter or code in a Haynes manual. Never tried it or researched it, so for all I know it could be BS...might be worth a few minutes to look into though. Tell us how it goes!
 
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Discussion Starter · #3 ·
Thanks man , weird thing this morning check engine light never came on with my 25 mile ride to work, I'll see if it comes on with the ride home , I think it may have come on with me cleaning the throttle body who knows. But thanks for the help
 

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I know it works on 91 & newer. Done it myself on my 94. 3 cycles of the ignition, then leave it on (never start it, just to ign setting, then off).

http://www.jeephorizons.com/tech/yj_codes.html

And apparently nowhere has a 12 listed, but it does exist. It means your battery was disconnected recently, like a bad connection coming and going over bumps.

Computers run self checks, and when there is a problem they "send a report", kind of like a cop would, but then go back to their "beat". As long as they keep finding problems, they keep sending reports. The "office" holds each report for a little while, usually 50 cycles of the ignition, and then drops them. If no other problems came up, i.e. no more reports got filed, the light goes away. Most every car maker works to some degree off of this exampl3.
 

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On board diagnostic codes for the YJ are

OBDI for Jeep YJ 1991-1995.
Turn key on/off three times, then on (engine not running), engine light will flash codes. Longer pauses are breaks between codes. Last code will be 55.
Ignore code 33 on non ac YJ's


11 No ignition reference signal detected during cranking OR timing belt skipped one or more teeth; OR loss of either camshaft or crankshaft position sensor.
12 Battery or computer recently disconnected
13 MAP sensor or vacuum line may not be working
14 MAP sensor voltage below .16V or over 4.96V
15 No speed/distance sensor signal
16 Loss of battery voltage detected with engine running
17 Engine stays cool too long (bad thermostat or coolant sensor?)
OR
17 (1985 turbo only): knock sensor circuit
21 Oxygen sensor signal doesn't change (stays at 4.3-4.5V). Probably bad oxygen sensor
22 Coolant sensor signal out of range - May have been disconnected to set timing
23 Incoming air temperature sensor may be bad
24 Throttle position sensor over 4.96V
25 Automatic Idle Speed (AIS) motor driver circuit shorted or target idle not reached
26 Peak injector circuit voltage has not been reached (need to check computer signals, voltage reg, injectors)
27 Injector circuit isn't switching when it's told to (TBI)
OR (MPI) injector circuit #1 not switching right
OR (turbo) injector circuit #2 not switching right
OR (all 1990-) injector output driver not responding
- check computer, connections
31 Bad evaporator purge solenoid circuit or driver
32 (1984 only) power loss/limited lamp or circuit
OR
32 EGR gases not working (1988) - check vacuum, valve
OR
32 (1990-92) computer didn't see change in air/'fuel ratio when EGR activated - check valve, vacuum lines, and EGR electrical
33 Air conditioning clutch relay circuit open or shorted (may be in the wide-open-throttle cutoff circuit or normal on early 80's models if you don't have air conditioning)
34 (1984-86) EGR solenoid circuit shorted or open
OR
34 (1987-1991) speed control shorted or open
35 Cooling fan relay circuit open or shorted
OR
35 idle switch motor fault - check connections
36 (turbo only) Wastegate control circuit open or shorted
37 Shift indicator light failure, 5-speed
OR
part throttle lock/unlock solenoid driver circuit (87-89)
OR
solenoid coil circuit (85-87 Turbo only)
OR
Trans temperature sensor voltage low (1995 and on)
41 Alternator field control circuit open or shorted
42 Automatic shutdown relay circuit open or shorted
OR
42 Fuel pump relay control circuit
OR
42 Fuel level unit - no change over miles
OR
42 Z1 voltage missing when autoshutdown circuit energized (The Z1 voltage is the voltage of the circuits fed by the autoshutdown relay. This typically includes fuel pump and switched-battery feed to the ignition coil)
43 Peak primary coil current not achieved with max dwell time
OR
43 Cylinder misfire
OR
43 Problem in power module to logic module interface
44 No FJ2 voltage present at logic board
OR
44 Logic module self-diagnostics indicate problem
OR
44 Battery temperature out of range
45 Turbo boost limit exceeded (engine was shut down by logic module)
46 Battery voltage too high during charging or charging system voltage too low
47 Battery voltage too low and alternator output too low
51 Oxygen sensor stuck at lean position (this may be tripped by a bad MAP sensor system causing a rich condition. If you get hot rough idle and stalling, especially on deceleration, accompanied by flooded engine and difficulty restarting, that can be a bad MAP sensor causing the O2 sensor to try to compensate. If you get poor cold driveability, stumbling and bucking, and acceptable warm driving with poor gas mileage (a drop of 10 mpg or more), that is usually the O2 sensor.
OR
51 Internal logic module fault ('84 turbo only).
52 Oxygen sensor stuck at rich position
OR
52 Internal logic module fault ('84 turbo only)
53 Logic module internal problem
54 No sync pickup signal during engine rotation (turbo only)
OR
54 Internal logic module fault ('84 turbo only) - or camshaft sensor/distributor timing
55 End of codes
61 "Baro" sensor open or shorted
62 EMR mileage cannot be stored in EEPROM
62 PCM failure SRI mile not stored
63 Controller cannot write to EEPROM
64 Catalytic converter efficiency failure
65 Power steering switch failure
 

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I get code 33 on my '91 4.0L with a manual trans but I have no A/C. What else could trigger this code? From the above could it be something with the wide open throttle sensor?
 

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caposto said:
I get code 33 on my '91 4.0L with a manual trans but I have no A/C. What else could trigger this code? From the above could it be something with the wide open throttle sensor?
Having no ac triggers the code. All yjs without ac throw it, it's a Jeep thing ;)
 

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caposto said:
I get code 33 on my '91 4.0L with a manual trans but I have no A/C. What else could trigger this code? From the above could it be something with the wide open throttle sensor?
It always gives that code to me, but it wont trigger the light if its the only code.
 
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