P041

Circuit Description

The diagnostic test checks for CAM reference pulses not received when 4X reference pulses are being received. This indicates a CAM sensor circuit failure and Code P041 is set.

Test Condition(s)

1. Code P012 not set.
2. 4X reference pulses being received.
3. Engine speed 1600 rpm or less.

Failure Condition(s)

A CAM reference pulse was not received for 5.3 seconds.

Action Taken

PCM turns 'ON' the 'SERVICE ENGINE SOON' MIL

Notes on Fault Tree

1. Check to see if Code P035 is set because a REF LO problem can cause other ignition problems.
2. Checking the resistance of the camshaft position sensor. The resistance should be 800-2100 ohms. If the resistance is greater, check for an open or if it is less, check for a short to ground or each other.
3. Checking if CKT 631 or CKT 632 is shorted to ground.
4. If the sensor is able to produce a DC voltage greater than 0.2 volt the sensor is OK.
5. With engine running, measuring greater than 4 Hz shows that the ignition control module is producing CAM pulses.
6. Checking for a circuit fault or faulty ICM.