Camshaft Position (CMP) Sensor And Cam Signal

The CMP sensor sends a cam signal to the PCM which uses the signal as a sync pulse in order to trigger the injectors in the correct sequence. The CAM signal is passed through the ICM. The signal is filtered and buffered by the ICM, but the signal is not processed in any other way. The PCM uses the CAM signal in order to indicate the position of the #1 piston during the pistons power stroke. This allows the PCM to calculate a true Sequential Fuel Injection (SFI) mode of operation. If the PCM detects an incorrect CAM signal while the engine is running, DTC P0341 is set.

If the CAM signal is lost while the engine is running, the fuel injection system shifts to a calculated SFI mode based upon the last fuel injection pulse, and the engine continues to run. The engine can be restarted and run in the calculated sequential mode as long as the fault is present, with a 1 in 6 chance of the sequence being correct.

Refer to DTC P0341 Camshaft Position (CMP) Sensor Performance for further information.