Diagnostic Aids

WARNING: This page is about a different car, the 2003 GMC Savana and 2003 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.

The CKP system variation compensating values are stored in PCM memory after a learn procedure has been performed. If the actual CKP variation is not within the CKP system variation compensating values stored in the PCM memory, DTC P0300 may set. The CKP system variation learn procedure is also required when the following service procedures have been performed, regardless of whether DTC P0315 is set:

An engine replacement.
A PCM replacement.
A harmonic balancer replacement.
A CKP sensor replacement.
Any engine repairs which disturb the CKP sensor relationship.

If the CKP system variation learn procedure cannot be performed successfully, inspect for the following conditions:

Worn crankshaft main bearings.
A damaged reluctor wheel.
Interference in the signal circuit of the CKP sensor.
A coolant temperature that is not within the Conditions For Running The DTC.
The ignition switch is in the ON position until the battery has sufficient voltage.
A PCM power disconnect with the ignition ON may erase the stored value and set DTC P0315.
Any foreign material passing between the CKP sensor and the reluctor wheel.