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PCM Codes

Background: The information described below allows you to determine
why the Check Engine light is illuminated.


About the PCM

When an fault with your car is detected it stores the fault in it's internal EEPROM. Normally, you have to take your car to a dealer to have the problem diagnosed. Thanks to Chrysler's and Mitsubishi's ingenuity, the codes can be displayed with a few simple turns of the ignition key. Although the
codes listed will help you diagnose a problem with your car, they do not allow for complete diagnosis and/or also may not even be the actual problem.

For complete diagnosis you will require a scan tool and a service manual. I can't stress enough the help that the service manual provides for problem diagnosis. Everyone should own a service manual if they are planning to do any work on their car.

THE KEYDANCE

To check the PCM codes, insert the key into the ignition and switch the key ON-OFF-ON-OFF-ON within a 5 sec. time period. Then count the Engine light flashes. The number of flashes represents the trouble code. There is a slight pause between the flashes representing the first and second digits of the code. Longer pauses separate indivdual trouble codes. All codes will end with 55 which signifies End of Codes / No detected failure.

IF A CODE IS A LINK

Click on it, and you should have a detailed way to troubleshoot the code.

The diagnostic items are shown in the following table. Note that a faults numeric codes are different,
depending on the method of inspection.


PCM Codes and Datalogger designations for the DSM 420A

Scan tool (MUT-II) General scan tool CEL Diagnostic Items Check items
---- ---- *55 End of error messages (if this code is the only one indicated, no errors were encountered)
----
----
12
direct power input to the PCM has been disconnected within the last 50 key-on cycles
----
01
PO340
54
No cam signal at PCM
camshaft position sensor connector and sensor
02
PO605
53
Internal controller failure
Replace the PCM
05
----
47
Charging system voltage too low
Alternator drive belt / Harness and connector / Alternator
06
----
46
Charging system voltage too high
Alternator drive belt / Harness and connector / Alternator
10
----
42
MFI relay (ASD_relay) control circuit
Harness and connector / Fuel pump relay
11
----
41
Generator field not switching properly
Harness and connector / Alternator
16
----
33
A/C clutch relay circuit
Harness and connector / A/C clutch relay
17
PO403
32
EGR solenoid circuit
Harness and connector / Electric EGR transducer solenoid / EGR valve / EGR tube clogged / Vacuum hoses
18
PO443
31
EVAP solenoid circuit
Evaporative purge solenoid / Clogged purge line / Vacuum hose / Evaporative emission canister clogged
61
PO204
27
Injector #4 control circuit
Harness and connector / Injectors
19
PO203
27
Injector #3 control circuit
Harness and connector / Injectors
20
PO202
27
Injector #2 control circuit
Harness and connector / Injectors
21
PO201
27
Injector #1 control circuit
Harness and connector / Injectors
25
PO505
25
Idle air control motor circuit
Harness and connector / Idle air control motor
26
PO122
24
Throttle position sensor voltage low
Harness and connector / Throttle position sensor
27
PO123
24
Throttle position sensor voltage high
Harness and connector / Throttle position sensor
30
PO117
22
Engine coolant temperature sensor voltage too low
Harness and connector / Engine coolant sensor
32
PO134
21
Upstream H02S stays at center
Harness and connector / Upstream HO2S
33
----
17
Engine is cold too long
Engine cooland temperature sensor circuit and connector / Engine coolant temperature sensor / Thermostat
35
PO500
15
No vehicle speed sensor signal
Harness and connector / Vehicle speed sensor
36
PO107
14
MAP sensor voltage too low
Harness and connector / Replace MAP sensor
37
PO108
14
MAP sensor voltage too high
Harness and connector / Bad VC1 / Replace MAP sensor
39
P1297
13
No change in MAP from start to run
Harness and connector / Replace MAP sensor
40
PO335
11
No crank reference signal at PCM
Check connector at PCM / Check crankshaft position sensor and harness
42
PO352
43
Ignition coil #2 primary circuit
Harness and connector / Ignition coil #2
43
PO351
43
Ignition coil #1 primary circuit
Harness and connector / Ignition coil #1
44
----
42
No MFI relay (ASD_relay) output voltage at PCM
Harness and connector / MFI relay (ASD_relay)
46
PO401
32
EGR System Failure
Harness and connector / Electric EGR transducer solenoid / EGR valve / EGR tube clogged / Vacuum hoses
48
----
62
PCM failure SRI mile not stored
Check PCM Harness / Replace the PCM
49
----
63
PCM failure EEPROM write denied
Replace the PCM
51
PO412
36
Pulsed secondary air injection solenoid circuit
Legacy code - Pulsed secondary air injection recalled and removed in '96
57
PO112
23
Intake air temperature sensor voltage low
Harness and connector / Intake air temperature sensor
58
PO113
23
Intake air temperature sensor voltage high
Harness and connector / Intake air temperature sensor
59
PO325
16
Knock sensor #l circuit
Harness and connector / Knock sensor
62
PO132
21
Upstream H02S shorted to voltage
Harness and connector / Upstream HO2S
68
PO605
53
PCM failure SPI communications
Replace the PCM
71
----
44
Battery temperature sensor volts out of limit
Battery temperature sensor or harness / Replace the PCM
92
P1490
35
Low speed fan control relay circuit
Harness and connector / Low speed fan relay
93
P1489
35
high speed fan control relay circuit
Harness and connector / High speed fan relay
99
P1698
66
No CCD messages from TCM
Harness and connector / Replace TCM
101
----
42
Fuel pump relay control circuit
Harness and connector / Fuel pump relay
102
PO133
21
Upstream H02S response
Harness and connector / Upstream HO2S
103
PO135
21
Upstream H02S heater failure
Harness and connector / Upstream HO2S
104
PO139
21
Downstream HO2S stays at center (M/T)
Harness and connector / Downstream H02S / Fuel system
105
PO141
21
Downstream HO2S heater failure (M/T)
Harness and connector / Downstream HO2S
106
PO300
43
Multiple cylinder misfire*
Ignition coil / Spark plugs / Ignition circuit / Injector / Upstream HO2S / Compression pressure / Timing belt / Crankshaft position sensor / Air intake / Fuel pressure / Crankshaft position sensor circuit and connector / Bad tuning
107
PO301
43
Cylinder #l misfire*
Ignition coil / Spark plugs / Ignition circuit / Injector / Upstream HO2S / Compression pressure / Timing belt / Crankshaft position sensor / Air intake / Fuel pressure / Crankshaft position sensor circuit and connector / Bad tuning
108
PO302
43
Cylinder #2 misfire*
Ignition coil / Spark plugs / Ignition circuit / Injector / Upstream HO2S / Compression pressure / Timing belt / Crankshaft position sensor / Air intake / Fuel pressure / Crankshaft position sensor circuit and connector / Bad tuning
109
PO303
43
Cylinder #3 misfire*
Ignition coil / Spark plugs / Ignition circuit / Injector / Upstream HO2S / Compression pressure / Timing belt / Crankshaft position sensor / Air intake / Fuel pressure / Crankshaft position sensor circuit and connector / Bad tuning
110
PO304
43
Cylinder #4 misfire*
Ignition coil / Spark plugs / Ignition circuit / Injector / Upstream HO2S / Compression pressure / Timing belt / Crankshaft position sensor / Air intake / Fuel pressure / Crankshaft position sensor circuit and connector / Bad tuning
111
PO411
36
Too little secondary air or too much secondary air
Obsolete code - Pulsed Secondary Air injection recalled and removed in '96
112
PO422
64
Catalytic converter efficiency failure
Exhaust manifold for cracks / Replace catalytic converter
113
PO441
31
Evaporative purge flow monitor failure
Evaporative purge solenoid / Clogged purge line / Vacuum hose / Evaporative emission canister clogged / You're Turbo with a 97, 98, or 99 2GNT
114
P1899
37
Park/Neutral switch
Replace the PCM
115
PO551
65
Power steering switch failure
Harness and connector / Power steering pressure switch / Power Steering Pump / Low fluid level
118
PO172
52
Fuel System Rich
MAP sensor output / Injector / Fuel pressure / Intake air leaks / Heated oxygen sensor / Adjust S-AFC
119
PO171
51
Fuel System Lean
MAP sensor output / Injector / Fuel pressure / Intake air leaks / Heated oxygen sensor / Adjust S-AFC
126
PO138
21
Downstream H02S shorted to voltage
Harness and connector / Downstream HO2S
128
PO125
17
Closed loop temperature not reached
Engine coolant temperature sensor circuit and connector / Engine coolant sensor / Thermostat
132
PO121
24
Throttle position sensor voltage does not agree with MAP
Harness and connector / Throttle position sensor output / MAP sensor output
133
P1390
11
Timing belt skipped 1 tooth or more
Check timing belt / Check crankshaft sensor and camshaft position sensor / Check PCM connector
138
P1294
25
Target idle not reached (+/-200 r/min)
Harness and connector / Idle air control motor / Vaccuum leak
157
P1391
11
Intermittent loss of Camshaft Position Sensor or Crankshaft Position Sensor
Crankshaft position sensor and camshaft position sensor connector / bad Camshaft Position Sensor oil seal

Note: (A/T) refers to Automatic Transmission, (M/T) refers to Manual Transmission, A/C refers to air conditioning. This info taken from the 1997 DSM Factory Service Manual, Vol - 1 Engine and Body. All information is copyright Mitsubishi Motors Corporation.
There are general OBD2 codes that are not listed in this document, as they are not 2GNT specific.



Document statistics: Last modified on 2008-01-22 08:19:17 by DarkOne


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