Circuit/System Testing
NOTE:
The Crankshaft Position Variation Learn may have to be repeated up to 5 times before the procedure is successful.
- Perform the Crankshaft Position System Variation Learn
procedure. The scan tool should display Learned Successful.
- If the Crankshaft Position System Variation Learn Procedure cannot be performed successfully, inspect for the following conditions:
- Worn crankshaft main bearings
- A damaged or misaligned reluctor wheel
- Excessive crankshaft runout
- A damaged crankshaft-Refer to Crankshaft and Bearing Cleaning and Inspection .
- Interference in the signal circuit of the crankshaft position sensor
- The ignition switch is in the ON position until there is insufficient system voltage.
- An ECM power disconnect with the ignition ON that may have erased the crankshaft position system variation values and set DTC P0315
- Debris between the crankshaft position sensor and the reluctor wheel
- If the Crankshaft Position System Variation Learn Procedure cannot be performed successfully, inspect for the following conditions:
- Verify the Learn Procedure is successful.
- If the ECM is unable to complete the learn procedure, replace the ECM.