Operation CHARM: Car repair manuals for everyone.

No Cam Signal at PCM

Name of Code:
No Cam Signal at PCM

When Monitored:
During engine cranking after 64 crank position signals.

Set Condition:
If no signal from the cam position sensor is present with crank signal, the code will set.

Theory of Operation:
The camshaft position (CMP) sensor is a hall-effect-type sensor used to detect the camshaft position. The PCM supplies an 8-volt supply a sensor ground, and a 5-volt pull-up voltage to the CMP sensor. The sensor provides an output signal that is on for 180 degrees and then off for 180 degrees. A rising camshaft signal edge identifies cylinder #1 and a falling camshaft signal edge identifies cylinder #4.

Possible Causes:
- Open 8-volt supply circuit
- Open sensor ground
- Open or shorted signal circuit
- Failed sensor
- Failed PCM
- Connector terminals
- Connector wires