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I just recently bought an '89 Jeep Cherokee, and I just read a post about a diagnostic procedure including 'on off on off'... how exactly does that work?

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Soon to be a 4.0L Cherokee
 

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What you are supposed to do is rev the engine to about 2500 and hold for 30 seconds then let it die down slowly. Also if you have a automatic you must cycle through all the gears and back to park. Once this is done turn off engine and turn the key on off on off then on [ make sure the key is going to the run position] your check engine light will start to flash. It will flash say 3X then pause and flash again then pause. This will give you one number 3 and what ever the next number is say 4 for a total of 34.once you receive all the codes it will give you a 55 to tell you the code is done... Take the code and cross reference them to a manual for the vehicle and that is it...

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92yj d44 front& rear.4.09
33 geolanders
mazda 626 seats
2.5 susp lift 3" body
revolver shackles coming
with motor swap..
 

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Superfly
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From http://www.bc4x4.com/faqs/yj.cfm:

Diagnostic Codes
From the Chrysler FAQ

Start with the ignition off. Within five seconds, switch the key on,
off, on, off, on. (On is not start!)

The "check engine" light will flash. Count the flashes
Each code is a two digit code, so a (for example) 23 would be
FLASH FLASH FLASH FLASH FLASH

It will never flash more than 9 times, watch for pauses!

55 is end of codes, 33 is normal if you dont have air conditioning.

Please note that some codes are NOT included below, this
is not a complete listing, but it IS very close to complete.

88 Start of test (This only appears on DRBII, it's not blinked out)
11 No ignition reference signal detected during cranking (bad hall
effect)
OR timing belt skipped one or more teeth; or intermittent
loss of either camshaft or crankshaft position sensor
12 Memory Standby power lost (battery cable disconnected)
13* No change in MAP from start to run
14* MAP sensor circuit open or shorted; voltage too low
15 No speed/distance sensor signal
16* Loss of battery voltage detected with engine running
17 Engine stays cold too long (bad thermostat)
21 Oxygen sensor signal out of range, possibly shorted
22* Coolant sensor signal out of range (or disconnected to set timing)
23 Intake air temperature signal out of range
24* Throttle position circuit out of range
25 Automatic Idle Speed (AIS) motor driver circuit shorted
or target idle not reached, vacuum leak found
26 Peak injector circuit voltage has not been reached
27 Logic module fuel circuit internal problem
OR
27 TBI injector does not respond properly to control signal
31 Evaporator Purge solenoid circuit open or shorted OR
Evaparator solenoid circuit
32 EGR system failure OR
Power loss lamp open or shorted
33 Air conditioning clutch relay circuit open or shorted
34 Speed control vacuum or vent solenoid circuits open or shorted
35 Cooling fan relay circuit open or shorted
36 Wastegate control circuit open or shorted
37 Shift indicator light failure, 5-speed (blown bulb) OR
Park/neutral switch failure
OR
37 Torque converter unlock circuit open or shorted, A-413 4-speed auto
41* Alternator field control circuit open or shorted
42 Automatic shutdown relay circuit open or shorted
42 Fuel pump relay control circuit
42 Fuel level unit - no change over miles
OR
42 Z1 voltage missing when autoshutdown circuit energized (whatever
that means)
43 Peak primary coil current not achieved with max dwell time
OR
43 Cylinder misfire
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 (see Note #1!)
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
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)
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

* Activates Power Limited/Check Engine light.

These codes cover multiple years and engines (2.2l, 2.5l,
3.0l). NOTE #1. The power module has an air-cooled resistor which
is used to sense the incoming air temperature. This information
is fed to the logic module and is used to control the duty cycle
of the field current in the alternator. This code applies ONLY
to alternators whose voltage is computer regulated. The battery
voltage is sensed by the logic module -- there is an internal
takeoff from the wire feeding the NVRAM keep-alive power circuit
which is fed to a voltage comparator. So...if you lose the feed
to keep RAM information stored when the engine's off, you also
lose battery voltage sensing.

-- Bohdan Bodnar




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19911995409993004:144444.103512.58274



 

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If you have an 89 you have the "Renix" AMC computer, not the Chrysler one. It's still possible to read the codes, but there's a contact someplace you need to "jumper" first, and I don't know which one it is.



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Chris S.
2002 KJ - staying stock (almost)
2000 TJ - 2" suspension lift, 1/2" body lift, assorted skids, hooks, rock rails, rock lights, 33" BFG MTs, custom bumper, Warn 8274
Mud Puppy's Jeep site
 

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Yeah you need the Chrysler computer to do as I described...

Reason #999 why I bought the '95 XJ.


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Phil M. - Kent, WA
95 XJ Sport w/Stuff
"Who cares about a list of crap, can you drive it?"
 
G

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The topic for this string sounds like something you'd find in the Kama Sutra!


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High Country Explorers
Red YJ 4" lift
"I hope that was the skidplate"
www.members.home.net/ichris4x4/index
 

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Bad YJ, bad bad bad red YJ...

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Phil M. - Kent, WA
95 XJ Sport w/Stuff
"Who cares about a list of crap, can you drive it?"
 

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Originally posted by ichris4x4:
The topic for this string sounds like something you'd find in the Kama Sutra!



No doubt!


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Play hard + Rest easy
Drive a Jeep--'92 YJ
Option...Black Nite
 
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