Circuit/System Testing

WARNING: This page is about a different car, the 2006 Saturn Ion 3. However, it is still accessible from the selected car via links, so may be relevant.

IMPORTANT: The CKP System Variation Learn Procedure may have to be repeated up to 5 times before the procedure is learned for various reasons.

Perform the CKP System Variation Learn Procedure. Refer to CKP System Variation Learn Procedure . 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 reluctor wheel
Excessive crankshaft runout
A damaged crankshaft-Refer to Crankshaft and Bearings Cleaning and Inspection .
Interference in the signal circuit of the CKP sensor
The ignition switch is in the ON position until the battery is drained.
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