Camshaft Position Sensor: Description and Operation

Camshaft Position (CMP) Sensor and Signal
The camshaft position (CMP) sensor sends a CMP signal to the PCM. The PCM uses this signal as a "sync pulse" to trigger the injectors in the proper sequence. The PCM uses the CMP signal to indicate the position of the #1 piston during its power stroke. This allows the PCM to calculate true sequential fuel injection (SFI) mode of operation. If the PCM detects an incorrect CMP signal while the engine is running, DTC P0341 will set. If the CMP signal is lost while the engine is running, the fuel injection system will shift to a calculated sequential fuel injection mode based on the last fuel injection pulse, and the engine will continue to run. As long as the fault is present, the engine can be restarted. It will run in the calculated sequential mode with a 1-in-6 chance of the injector sequence being correct.





Camshaft Position (CMP) Sensor
CMP is located Left Hard Rear cylinder head. When the Hall-effect switch is activated it grounds the signal line to the PCM, pulling the camshaft position sensor signal circuit's applied voltage low. This is a CMP signal. The CMP signals is created as piston #1 is approximately 25 after top dead counter on the power stroke. If the correct CMP signal is not received by the PCM, DTC P0341 will be set.