Malibu V6-191 3.1L VIN M SFI (1997)
Camshaft Position Sensor: Description and Operation
Camshaft Position Sensor
DESCRIPTION
The Camshaft Position Sensor (CMP) sends a cam signal to the PCM which uses it as a sync pulse to trigger the injectors in proper sequence. The CAM
signal is passed through the ignition control module. It is filtered and buffered by the ignition control module, but the signal is not processed in any other
way. The PCM uses the CAM 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 CAM signal while the engine is running, DTC P0341 will set.
If the CAM 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. The engine can be restarted and will run in the calculated sequential mode as long as the fault is
present with a 1 in 6 chance of injector sequence being correct. Refer to DTC P0341/ Diagnostic Trouble Code Tables for further information. See:
Computers and Control Systems/Testing and Inspection
