Code P0341, Camshaft Position Sensor Extra Cam Pulses: Notes

During cranking, the Ignition Control Module (ICM) monitors the 3X crankshaft position sensor signal. The 3X signal is used to determine correct cylinder pair to spark first. ICM processes the 3X signal then sends a fuel control reference pulse to PCM. When PCM receives this pulse, all 6 injectors will be commanded to open for one priming shot of fuel in all cylinders. After the priming, injectors remain off for the next 6 fuel control reference pulses from ICM (2 crankshaft revolutions). This allows each cylinder a chance to use the fuel from the priming shot.

During this waiting period, a cam pulse will have been received by PCM. PCM will now begin to operate the injectors sequentially based on true camshaft position. With engine running, PCM monitors cam and fuel control references pulses received and expects to detect 6 fuel control pulses for each cam pulse.

Code P0341 will set when the following conditions are present.

Ratio of fuel control pulses to cam pulses does not equal 6.
Above condition for 10 occurrences during key cycle.

Code P0341 will illuminate Malfunction Indicator Light (MIL).

NOTE: Test numbers refer to numbers on diagnostic chart.

Determines if conditions necessary to set Code P0341 exist.
Determines if fault is in wiring, camshaft sensor or PCM.