Camshaft Position Sensor: Description and Operation

Camshaft Position Sensor:

Ignition System:

DESCRIPTION
The camshaft position sensor is located on the top of the cylinder head towards #3 cylinder. As the camshaft turns a lobe cast on to it, the cam sensor, pulling the cam signal line's applied voltage low. This is interpreted as a cam signal. The cam signal is created as piston #1 is on the intake stroke.

CAM SIGNAL (CKT 630)
The PCM uses this signal to determine the position of the #1 piston during its power stroke. This signal is used by the PCM to calculate the Sequential Fuel Injection (SF1) mode of operation. A loss of this signal will set a DTC P0342.

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 being correct. See DTC P0342 for further information.