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 Powertrain Control Module (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