Crankshaft Position System Variation Learn
NOTE:
The Crankshaft Position Variation Learn procedure is also required when the following service procedures have been performed, regardless of whether DTC P0315 is set:
- An engine replacement
- An engine control module (ECM) replacement
- A crankshaft balancer replacement
- A crankshaft replacement
- A crankshaft position sensor 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 Variation Learn procedure.
- Ignition ON, observe the DTC information with a scan tool. Verify no other DTCs are set, except DTCs P0300-P0304, or P0315.
- If DTCs are set, except DTCs P0300-P0304, or P0315, refer to Diagnostic Trouble Code (DTC) List - Vehicle for further diagnosis.
- Select the Crankshaft Position Variation Learn Procedure with a scan tool and perform the following:
- Block drive wheels.
- Set parking brake.
- DO NOT apply brake pedal.
- Turn the air conditioning (A/C) OFF.
- When directed, apply and hold brake pedal for the duration of the procedure.
- Ignition ON, engine running at operating temperature.
- The vehicle must remain in Park or Neutral.
- Accelerate to wide open throttle (WOT) and release when the fuel cut-off occurs.
NOTE:Close the hood.
NOTE:The engine must be at operating temperature.
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.
- The scan tool displays Learn In Progress.
- The scan tool displays Learn Successful.
- 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 for the applicable DTC that set.
- 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.