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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 toolCELDiagnostic ItemsCheck 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 07:19:17 by DarkOne


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