No Cam Signal at PCM

Name of Code:
No Cam 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 used to detect the camshaft position. The powertrain control module provides the sensor with a 8-volt source, 5-volt pull-up, and a sensor ground. The sensor signal is created by the slots cut in the camshaft sprocket passing under the sensor. When a slot is under the sensor, the signal is high (5V). When the metal between the slots is under the sensor, the signal is low (0.3v).

Possible Causes:
- Open 8-volt supply circuit
- Open sensor ground
- Open or shorted signal circuit
- Excessive clearance between the sensor and sprocket
- Damaged sprocket
- Failed sensor
- Failed PCM