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    2004 Chevrolet Cavalier 2.2L SFI DOHC 4cyl

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    1980 HARLEM AVE
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    Century, Grand Prix, Impala, Intrigue, Lumina, Monte Carlo, Regal 2001-2005

    3.8L Engine

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    The camshaft position PCM input is produced by the ignition control module (ICM). The ICM produces the camshaft position PCM input by filtering the camshaft position (CMP) sensor pulses when the engine is running and CKP sync pulses are also being received. The powertrain control module (PCM) uses the camshaft position PCM input pulses to initiate sequential fuel injection and to determine crankshaft position for the misfire diagnostic. The PCM constantly monitors the number of pulses on the camshaft position PCM input circuit and compares the number of camshaft position PCM input pulses to the number of 18X reference pulses and the number of 3X reference pulses being received. If the PCM receives an incorrect number of pulses on the camshaft position PCM input circuit, the PCM will initiate injector sequence without the camshaft position PCM input with a one in six chance that injector sequence is correct. The engine will continue to start and run normally, although the misfire diagnostic will be disabled. DTC P0341 will set.

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    Fig. CMP sensor location on 3.8L (2001-02)



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    Fig. CMP sensor location on 3.8L (2003-05)

    The 18X reference signal is produced by the ignition control module (ICM). The ICM calculates the 18X reference signal by filtering the crankshaft position (CKP) sensor 18X pulses when the engine is running and CKP sync pulses are also being received. The powertrain control module (PCM) uses the 18X reference signal to calculate engine RPM and crankshaft position at engine speeds below 1200 RPM. The PCM constantly monitors the number of pulses on the 18X Reference circuit and compares the number of 18X reference pulses to the number of 3X reference pulses and CAM signal pulses being received. If the PCM receives an incorrect number of pulses on the 18X Reference circuit, the PCM will use the 3X reference signal circuit for fuel and ignition control. The engine will continue to start and run using the 3X reference and CAM signals only. DTC P0336 will set.

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    Fig.

     
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