Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
You wil need to do a pin point test to find whats going on it could be numerous things
Circuit Description The Camshaft Position (CMP) sensor is a sensor designed to detect changes in a magnetic field. The Control Module (PCM/VCM) supplies the CMP sensor with signal and ground circuits. Ignition voltage is supplied to the CMP sensor by an independent circuit. The CMP sensor produces a magnetic field whenever the ignition is ON. The CMP sensor is mounted near a reluctor wheel that is attached to the distributor shaft. When the distributor shaft rotates (the engine is cranking or running) the reluctor wheel changes the magnetic field. The CMP sensor converts each change in the magnetic field into a "pulse." The number of teeth on the reluctor wheel determines how many pulses the CMP sensor detects per camshaft rotation. The Control Module uses the CMP sensor signal in order to calculate the correct timing for sequential fuel injection.If the VCM does not detect the CMP signal while the engine is running this DTC will be set.Conditions for Running the DTC The engine is runningConditions for Setting the DTC The camshaft position sensor reference pulse is not detected once in every 2 crankshaft revolutions.Action Taken When the DTC Sets
Conditions for Clearing the MIL/DTC
Diagnostic Aids Electro-magnetic interference from the ignition coil or the spark plug wires could cause a poor signal condition in the CMP signal circuit to the VCM. Ensure the routing of the CMP sensor circuitry is correct. Also check for the installation of aftermarket accessories and harnesses creating an electro-magnetic interference.Refer to Symptoms. See: Symptom Related Diagnostic ProceduresCheck for the following conditions:An intermittent may be caused by any of the following conditions:
Thoroughly check any circuitry that is suspected of causing the intermittent complaint. Refer to Intermittents and Poor Connections Diagnosis.Test Description The number(s) below refer to the step number(s) in the diagnostic table.