Ok........ the flashes I saw don't make sense.
I saw: 12 35 73 35 4
Code 73 and 4 don't exist on any list of codes I've found. And there's no end of sequence code 55.
This is what I commonly refer to for '91-'95 XJ's:
Background
The newer Jeeps 1991-1996 XJ Cherokee and YJ Wrangler are equipped with an onboard problem reporting system that communicates to the owner through the check engine light. Not simply an "idiot" light, the check engine light can be triggered to flash in a series like morse code, where the user counts the number of flashes and looks up the corresponding trouble codes. These flashes equate to two digit numbers that report back, more or less, exactly what is failing on your Jeep.
When your check engine light comes on, do the following procedure to determine what is causing the system to report a problem. With the ignition off, switch the key on, off, on, off, on. (This needs to happen in under 5 seconds) Make sure you don't actually start your Jeep, turn the ignition to the ON position, but do not turn it so far that you start cranking the engine.
The check engine light will start to flash, count these flashes. Each code is a two digit number, for example 23 would be FLASH FLASH <pause> FLASH FLASH FLASH <long pause>
It will never flash more than 9 times, watch for pauses! The end of sequence code is 55.
Cherokee Engine Diagnostic codes
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 (Batt or computer recently 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 TBI injector does not respond properly to control signal
31 Evaporator Purge solenoid circuit open or shorted or Evaporator solenoid circuit
32 EGR system failure or Power loss lamp open or shorted
33 Air conditioning clutch relay circuit open or shorted ( Also will show up for rigs without AC)
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 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 Z1 voltage missing when auto shut-down circuit energized
43 Peak primary coil current not achieved with max dwell time OR Cylinder misfire
43 Problem in power module to logic module interface
44 No FJ2 voltage present at logic board OR Logic module self-diagnostics indicate problem OR 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 OR Internal logic module fault ('84 turbo only)
52 Oxygen sensor stuck at rich position OR Internal logic module fault ('84 turbo only)
53 Logic module internal problem
54 No sync pickup signal during engine rotation (turbo only) OR Internal logic module fault ('84 turbo only)
55 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
