No Cam Signal at PCM

NAME OF CODE
No Cam Signal at PCM

WHEN MONITORED
During engine cranking, after a number of crank position sensor signals have been detected.

SET CONDITION
Signals are not received from the camshaft position sensor when signals are received from the crankshaft position sensor.

THEORY OF OPERATION
The camshaft position (CMP) sensor is a hall-effect type sensor used to detect the camshaft's position. The PCM supplies 8 volts and a sensor ground to the CMP sensor. The camshaft position sensor signal circuit has a 5 volt pull-up from the PCM. The sensor signal is created by a rotating target magnet attached to the rear of the camshaft. When the north pole of the magnet passes under the sensor, the signal remains at 5 volts. When the the south pole passes under the sensor, the signal drops to 0.3 volt.

POSSIBLE CAUSES
- Open or shorted 8-volt supply circuit
- Open sensor ground
- Open or shorted signal circuit
- Excessive clearance between the sensor and target magnet
- Damaged target magnet
- Failed sensor
- Failed PCM
- Broken timing belt
- Connector terminals
- Connector wires