TC-1C No Cam Signal at PCM

Diagnostic Chart:

REPAIRING - 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 3350306
- Connector wires

INACTIVE TROUBLE CODE CONDITION

You have just attempted to simulate the condition that initially set the trouble code message. The following additional checks may assist you in identifying a possible intermittent problem:

- Visually inspect related wire harness connectors. Look for broken, bent, pushed out, or corroded terminals.

- Visually inspect the related harnesses. Look for chafed, pierced, or partially broken wire.

- Refer to any hotlines or technical service bulletins that may apply.