Question about 2001 Chrysler 300M
Engine quits after starting, will run fine if you keep RPM above 1000. The check engine light is not on. A scan using an autoXray scanner shows fault code 0108, MAP sensor voltage to high. I checked the voltage at the sensor IAW the Haynes repair manual. Connector removed, engine off, ignition on, 4.9 volts. Connector on, engine off, ignition on, 4.75 volts. Start engine, voltage varies 1.5 to 2.3 (rough to get accurate as engine will not idle below 1000) . If I'm reading it right the manual suggests a problem with the ECM, but I don't know enough about these systems to be sure, and I don't understand why the check engine light is not indicating a fault. When I conduct the test the fault light comes on, after I reset the code and restart the engine the check engine light does not come back on, however I still read thye code with my scanner.Side note; all other systems appear to be normal, except air conditioning, you have to cycle the temp controls to get cool air.
The ECM is most likey the culprit but I would check ground wires and wiring harness to be sure they aren't faulty. With you telling me the voltage is too high, it pretty much points to wiring but the ECM may have gone bad and its just sending blind signals hence the high voltage. The engine light isn't coming maybe because of the ECM isn't working. Pray it isnt the ECM, its costly but exhaust your options by checking wiring and ground beforing fingering the ECM
Posted on Dec 06, 2008
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Posted on Jan 02, 2017
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Trouble Code: P0301
Cylinder No. 1, 2, 3 or 4 Misfire Detected
Trouble Code Conditions: Engine is running; atmospheric pressure, fuel level, battery voltage, engine speed, engine load are above minimal predetermined specifications; the engine is not in fuel cutoff and intake air temperature and coolant temperature are within normal operating ranges; there are no DTCs relating to ECT, CMP, CKP, MAP or IAT Sensor, to Crank rationality, to Crank Sensor Learn invalid, or to System Voltage. If total misfires detected are greater than 7% during the first 1000 rpm, or are over 3% after the first 1000 rpm, or are 25% during any 200 rpm with suspect cylinder misfire counter more than 80% and no other cylinder misfire counters above 80%, this DTC will set. The MIL will flash after first trip occurrence and will be steady after second trip.
Fuel system problems existErratic CMP or CKP Sensor signalsIgnition system problems existEngine mechanical problems existPCM has failed
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