Camshaft Position (CMP) Sensor and CAM Signal

The camshaft position (CMP) sensor generates the signal sent to the PCM via the ICM. The ICM filters and buffers the CMP signal. The ICM then relays the signal to the PCM. The PCM uses the CMP signal as a sync pulse in order to trigger the injectors in the proper sequence. This allows the PCM to calculate 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 PCM detects a loss of the CAM signal while the engine is running, the fuel injection system shifts to a calculated SFI mode. The PCM determines the fuel injector sequence based on the last fuel injection pulse received. In the calculated SFI mode, the engine continues to start and run. However, with the fault present, only a 1 in 6 chance of the correct injector sequence exists.

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