Diagnostic Aids
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2002 Pontiac Grand Prix, 2002 Pontiac Bonneville, 2002 Chevrolet Monte Carlo, 2002 Chevrolet Impala, and 2002 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
The crankshaft position system variation compensating values are stored in the PCM's non-volatile memory after a learn procedure has been performed. If actual crankshaft position variation is not within the crankshaft position system variation compensating values stored in the PCM, 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 P1336 is set:
- An engine replacement.
- A PCM replacement.
- A harmonic balancer replacement.
- A crankshaft replacement.
- A crankshaft position sensor replacement.
- Any engine repairs which disturb the crankshaft to crankshaft position sensor relationship.
If the crankshaft position system variation learn procedure cannot be performed successfully, check the following conditions and correct as necessary:
- A damaged reluctor wheel.
- Excessive crankshaft runout.
- A damaged crankshaft.
- Interference in the signal circuit of the CKP sensor.
- A coolant temperature that is not within the Condition For Running DTC.
- The ignition switch is in the on position until the battery is drained.
- A PCM power disconnect with the ignition on may erase the stored value and set the DTC P1336.