Crankshaft Position System Variation Learning Procedure

Learning Procedure

Important A Crankshaft Position System Variation Learning Procedure must be performed any time a change is made to the crankshaft sensor to crankshaft relationship. Changing the crank sensor to crankshaft relationship will not allow the PCM to detect misfire at all speeds and loads accurately. Resulting in a possible false misfire DTC being set. Removing a part for inspection and then reinstalling the same part is considered a disturbance. A false DTC P0300 could be set if this procedure is not performed. Refer to Powertrain Control Module (PCM) and Sensors.

Caution When performing the Crankshaft Position System Variation Learning Procedure always set the vehicle parking brake and block the drive wheels. Release the throttle immediately when the engine starts to decelerate. Once the learn procedure is completed, engine control will be returned to the operator and the engine will respond to throttle position.

1. Install a scan tool.

2. Put vehicle in Park or Neutral.

3. Run the engine until it is at normal operating temperature.

4. Set the vehicle parking brake and block the drive wheels.

5. Turn all accessories OFF.

6. Enable the Crankshaft Position System Variation Learning Procedure with the scan tool.

7. Raise the engine speed to the specified value RELEASING the throttle as soon as the engine cuts out.

8. Verify with the scan tool that the crankshaft variation has been learned.

Perform this procedure up to 10 times. If the PCM will not learn the variation, a DTC P1336 should be set. Refer to DTC P1336 CKP System Variation Not Learned for diagnosis.