Try this taken from Chrysler Central
Getting the codesIf you have fuel injection, this works on most Chrysler, Plymouth, and Dodge cars made in the 1980s and 1990s.
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 (pause) FLASH FLASH FLASH (loong pause)
It will never flash more than 9 times, watch for pauses!
55 is end of codes, 33 is normal on earlier models if you don't 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. Most of it comes from the Mopar Mailing List.
* Activates Power Limited/Check Engine light on some models.
On newer cars (mid-to-late 1990s, 2000s): On later models with a digital odometer, the codes may be displayed on the odometer rather than blinking the check engine light. (This is the case on Peter Galambos' 1997 Dakota).
On 1995 and later Neons, and probably other Chrysler, Plymouth, Dodge, and Jeep models, when the check engine light goes on, you may be able to get the codes simply by putting in the key and moving it to the RUN position; the light will blink out the codes without all that OFF-ON stuff. This will not work if the check engine light is not already on.
Simultaneously press the trip reset and trip/odometer switches; while holding them, turn the ignition to RUN (not start), and wait about five seconds. This sends the car through a short self-test sequence that ights all segments of the odometer and shift selector read-out (where applicable). It will then display the stored error codes. (Courtesy Theodore M. Farabee of the U.S. Navy)
On Elko Tchernev's 1998 Stratus, where there is only one combined trip/odometer and reset switch, waiting for 5 seconds will just reset the trip odometer. The procedure that does something is a little different:
Press the switch, turn the ignition to ON, and release the switch as soon as the odometer displays "Check 1". This causes the computer to go through several check sequences (5, IIRC), for all lamps, LED segments and gauges, indicated by "Check 2" etc. and terminated by "End".
Note: When the computer indicates major failure, it will activate Limp In mode, which guesses about data to compensate for sensor failure. This is a nice feature not used by all automakers.
If you don't find your code in this list, try clicking here for a different site's lists.
11 No ignition reference signal detected during cranking (bad Hall effect) 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?)
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 (SEE NOTE #3)
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 (need to check computer signals, voltage reg, injectors) (SEE NOTE #4 BELOW)
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
32 EGR gases not working (1988) - check vacuum, valve
32 (1990-92, all but Turbo) 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)
34 (1984-86) EGR solenoid circuit shorted or open
34 (1987-1991) speed control shorted or open
35 Cooling fan relay circuit open or shorted
35 (trucks) idle switch motor fault - check connections
36 (turbo) Wastegate control circuit open or shorted
36 (3.9/5.2 RWD) solenoid coil circuit (air switching)
36 (Turbo IV) #3 Vent Solenoid open/short
37 Shift indicator light failure, 5-speed
part throttle lock/unlock solenoid driver circuit (87-89)
solenoid coil circuit (85-89 Turbo I-IV)
Trans temperature sensor voltage low (1995 and on; see NOTE 2)
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
42 Z1 voltage missing when autoshutdown circuit energized (SEE NOTE #6)
43 Peak primary coil current not achieved with max dwell time
43 Cylinder misfire
43 Problem in power module to logic module interface
44 No FJ2 voltage present at logic board
44 Logic module self-diagnostics indicate problem
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 (lean condition)
51 Internal logic module fault ('84 turbo only)
52 Oxygen sensor stuck at rich position (SEE NOTE #5!)
52 Internal logic module fault ('84 turbo only)
53 Logic module internal problem
54 No sync pickup signal during engine rotation (turbo only)
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
88 Start of test (not usually given, don't expect it)
Howell Fuel Injection