First you must find the codes. This is very easy. Just turn your car off. Start with the key in the off position. Turn the iginition key to the on and off positions (do not turn the key to the start position) within 5 seconds using this sequence: ON-OFF-ON-OFF-ON.
Count the # of flashes between the pauses. For example for a code 12 you will get Flash Pause Flash Flash or for 55 you will get Flash Flash Flash Flash Flash Pause Flash Flash Flash Flash Flash.
Here are the codes for the 1984-1993 Chrysler Engine Control Unit.
Note these are for my car, which is a 1990 Lebaron 3.0L V6.
Code# Description
11
Power has been disconnected(will go away after you start the car)
12
Power has been disconnected(will go away in 15 start stop cycles)
13
MAP-Manifold Absolute Pressure-Sensor Failure
14
Also a MAP Error
15
No speed/distance sensor signal
16
Loss of Battery voltage While Running
17
Thermostate is Broke(replace it)
21
Oxygen Sensor Error(MAY need replacing)
22
Coolant Temp Sensor is Messed up
23
Throttle Body Temp Sensor is Messed up
24
Throttle Position Sensor-TPS-is Messed up
25
AIS (Automatic Idle Speed) motor circuit shorted or target idle speed not reached(Don't Know What this means)
26
Peak Injector Current not Reached
27
Injector Driver Control Circut Messed Up
31
Purge canister/EGR solenoid circuit is messed up
32
Logic module did not see a change in air/fuel ratio when EGR circuit was activated
33
Air conditioning cut-out relay circuit is messed up
34
Speed control solenoid(s) circuit is messed up
35
Radiator Fan Relay Is Messed up
36
Air switching solenoid is messed up
37
Part throttle unlock (PTU) solenoid is Messed up
41
Bad voltage regulator or Connection(check your battery)
43
Ignition Coil Is Messed up
44
Bad Connection or wiring from SMEC and the ignition key
46
Bad voltage regulator
47
Bad voltage regulator
51
Oxygen Sensor Messed up
52
Oxygen Sensor Messed up
53
Internal logic module messed up
54
No fuel injector sync pickup signal during engine rotation(check Hall Effect Sensor)
55
End of Message
I got my codes off of This Mini-Mopar Site Fault Codes
