Trooper LS V6-3.5L (1998)
Camshaft Position Sensor: Description and Operation
General Description
The camshaft position (CMP) sensor is located on the timing cover near the camshaft sprocket. As the camshaft sprocket turns, a magnet in the
sprocket activates the Hall-effect switch in the CMP sensor. 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.
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.
Refer to DTC P0341 for further information.
