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 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