Circuit/System Testing

NOTE: The CKP system variation learn procedure may have to be repeated up to 5 times before the procedure is learned.

Perform the CKP system variation learn procedure. Refer to 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:

Any 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 stored value and set DTC P0315
Any debris between the CKP sensor and the reluctor wheel