P041

DTC P041:

Ignition Module Circuit:

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. 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.