Code P0342, Cam Sensor Error: Notes
During cranking, Ignition Control Module (ICM) monitors crankshaft position sensor signal. Signal is used to determine correct cylinder pair to spark first. ICM processes 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. However, if cam signal is not present at start-up, Code P0342 will set and PCM will start sequential fuel delivery in random pattern with a one in 6 chance that fuel delivery is correct. Code P0342 will set when following conditions are present.
- Engine is running.
- Cam signal is not received by PCM for last 5 seconds.
Code P0342 will illuminate Malfunction Indicator Light (MIL) and PCM will begin injector sequence based on last cam pulse. If cam pulses are not present at start-up, PCM will begin injector sequence based on fuel control pulses received.
- Checks for Code P0342 and determines if conditions necessary to set Code P0342 exist.
- Ensures camshaft position sensor is grounding circuit No. 630 (Black wire) as camshaft reluctor notch interfaces with sensor.