Crankshaft Position Sensor: Testing and Inspection

Crankshaft Position System Variation Learn

Note: The Crankshaft Position System Variation Learn procedure is also required when the following service procedures have been performed, regardless of whether DTC P0315 is set:

* An engine replacement

* A engine control module (ECM) or body control module (BCM) replacement

* A crankshaft balancer replacement

* A crankshaft removal and/or replacement

* A crankshaft position sensor disturbance/removal and/or replacement

* Any engine repairs which disturb the crankshaft to crankshaft position sensor relationship.

Note: The ECM monitors certain component signals to determine if all the conditions are met to continue with the crankshaft position System Variation Learn Procedure. The scan tool only displays the condition that inhibits the procedure. The scan tool displays the signals of the following components:

* Crankshaft position sensors activity-If there is a crankshaft position sensor condition, refer to the applicable DTC that set.

* Camshaft position sensor signal activity-If there is a camshaft position sensor signal condition, refer to the applicable DTC that set.

* Engine coolant temperature (ECT)-If the engine coolant temperature is not warm enough, idle the engine until the engine coolant temperature reaches the correct temperature.

1. Ignition ON, observe the DTC information with a scan tool. Verify no other DTCs are set, except DTCs P0300-P0306, or P0315.

• If DTCs are set, except DTCs P0300-P0304, or P0315, refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle for further diagnosis.

2. With a scan tool, select the Crankshaft Position System Variation Learn Procedure and perform the following:

Note: Close the hood.

Note: The engine must be at operating temperature.

1. Block drive wheels.

2. Set parking brake.

3. DO NOT apply brake pedal.

4. Turn the air conditioning (A/C) OFF.

5. When directed, apply and hold brake pedal for the duration of the procedure.

6. Ignition ON, engine running at operating temperature.

7. The vehicle must remain in Park or Neutral.

Note: While the learn procedure is in progress, release the throttle immediately when the engine starts to decelerate. The engine control is returned to the operator and the engine responds to throttle position after the learn procedure is complete.

8. Accelerate to wide open throttle (WOT) and release as soon as the fuel cut-off occurs.

9. Accelerate to wide open throttle (WOT) and release when the fuel cut-off occurs.

3. The scan tool displays Learn in Progress.

4. The scan tool displays Learn Successful.

5. If not successful, review the reject reason's on the scan tool and repeat step's 1-3.

6. Verify DTC P0315 ran and passed This Ignition Cycle.

• If DTC P0315 failed or did not run This Ignition Cycle, or another DTC is present, refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle for the applicable DTC that set.

7. Once the Crankshaft Position Variation Learn procedure has successfully completed, and in order to store the crankshaft position variation values in the ECM, turn OFF the ignition and verify all vehicle systems are OFF. This may take up to 2 minutes.