Crankshaft Position System Variation Learn

Crankshaft Position System Variation Learn

1. Install a scan tool.
2. Monitor the engine control module (ECM) for DTCs with a scan tool. If other DTCs are set, except DTC P0315, refer to Diagnostic Trouble Code (DTC) List - Vehicle (Diagnostic Trouble Code Descriptions) for the applicable DTC that set.
3. Select the crankshaft position (CKP) variation learn procedure with a scan tool.
4. The scan tool instructs you to perform the following:

Important: Close the hood.


Important: The engine must be at operating temperature.


1. Block drive wheels.
2. Set parking brake.
3. Apply and hold brake pedal.

Important: The engine may autostop and will restart as needed.


Important: The vehicle must remain in PARK.


4. Start the engine.

Important: The scan tool monitors certain component signals to determine if all the conditions are met to continue with the procedure. The scan tool only displays the condition that inhibits the procedure. The scan tool monitors the following components:


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

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

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


5. Enable the CKP System Variation Learn Procedure with a scan tool.
6. Quickly apply and release the accelerator pedal.

Important: The engine may autostop and will restart as needed.


7. Test in progress.

Important: If the scan tool indicates that DTC P0315 ran and passed, the CKP Variation Learn Procedure is complete. If the scan tool indicates DTC P0315 failed or did not run, refer to DTC P0315 (P0315). If any other DTCs set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (Diagnostic Trouble Code Descriptions) for the applicable DTC that set.


8. The scan tool displays Learn Status: Learned this ignition.
9. Turn OFF the ignition for 30 seconds after the learn procedure is completed successfully.
10. The CKP Variation Learn Procedure is also required when the following service procedures have been performed, regardless of whether DTC P0315 is set:

* A CKP sensor replacement
* An engine replacement
* A ECM replacement
* A harmonic balancer replacement
* A crankshaft replacement
* Any engine repairs which disturb the CKP sensor relationship