No Cam SYNC Signal at PCM

WHEN MONITORED
During engine cranking, after 32 crank position signals.

SET CONDITION
No signal from the cam position sensor is present with crank signal.

THEORY OF OPERATION
The cam position sensor is a hall effect-type sensor which produces a signal corresponding to camshaft position when the slots cut in the camshaft sprocket pass under the sensor.

- When a slot is under the sensor, the signal is high (5 volts).

- When the metal between the slots is under the sensor, the signal is low (0.3 volt).

The PCM supplies;

- 8 volts to power up the sensor, PCM cavity 7
- Sensor ground, PCM cavity 4
- 5-volt pull-up voltage to the sensor, from cavity 44.

PROBABLE CAUSES
- Open 8-volt supply circuit
- Open sensor ground
- Open or shorted signal circuit
- Damaged pulse ring
- Failed sensor
- Failed PCM