Possible Causes
NOTE: The listed causes may not be a complete list of all potential problems and there may be other causes.
- Faulty camshaft position sensor
- Camshaft position sensor harness is open or shorted
- Poor electrical connection in the camshaft position sensor circuit
Description
The camshaft position sensor is an electronic device used in an engine to record the rate at which the camshaft spins. This information is used by the Engine Control Module (ECM) to control ignition and fuel injection. The camshaft position sensor senses the retraction of the camshaft (intake) to identify a particular cylinder. The camshaft position sensor detects the piston position. The sensor system consists of a rotating part, typically a disk, as well as a static part, the sensor itself.
When the engine is rotating, the high and low parts of the teeth cause a change in the gap with the sensor. The changing gap causes a change in the magnetic field near the sensor. The change in the magnetic field causes a change in the sensor’s voltage.
When the crankshaft position sensor (POS) system becomes inoperative, the camshaft position sensor provides various commands for engine components instead, using the timing of the cylinder identification signals.
How to Repair
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
Detected
The camshaft position sensor signal is not detected by the Engine Control Module (ECM) during the first few seconds of engine cranking.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Lack/loss of power
- Engine stalling