No Cam Signal at PCM

Name of Code:
No Cam Signal PCM

When Monitored:
Ignition ON.

Set Condition:
If 95 crank signals are counted and no signal from the cam position sensor is present the code will set.

Theory of Operation:
The cam position sensor is a hall effect-type sensor used to detect the camshaft position. The PCM supplies 5 volts and a ground to power up the sensor. The PCM also supplies a 5-volt pull-up voltage. The sensor signal is created by the pulse ring in the distributor passing through the sensor. When the leading edge of the ring is in the sensor, the sensor is high (5.0V); when the trailing edge is clear of the sensor, the signal is low (0.3V).

Possible Causes:
- Open 5-volt supply circuit
- Open sensor ground
- Open or shorted signal circuit
- Damaged pulse ring
- Failed sensor
- Failed PCM