Code P0341, Cam Signal Error: Notes

During cranking, Ignition Control Module (ICM) monitors 3X crankshaft position sensor signal. 3X signal is used to determine correct cylinder pair to spark first. ICM processes 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 priming, injectors remain off for next 6 fuel control reference pulses from ICM (2 crankshaft revolutions). This allows each cylinder a chance to use fuel from priming shot.

During this waiting period, a cam pulse will have been received by PCM. PCM will now begin to operate 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 following conditions are present.

Cam signal is intermittent.
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.

If a failure is induced in fuel control reference circuit, voltage on circuit should change when faulty wiring or connection is manipulated.
Checks for an intermittent problem with fuel control reference signals to PCM.