Circuit/System Testing

NOTE: The CKP System Variation Learn Procedure may have to be repeated up to 5 times before the procedure is successful.

Perform the Crankshaft Position System Variation Learn . The scan tool should display Learned this Ignition.
If the CKP 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 CKP 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 CKP system variation values and set DTC P0315
- Debris between the CKP sensor and the reluctor wheel