Diagnostic Aids
WARNING: This page does not describe the selected car, but rather 13 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Sierra, 2002 GMC Savana Special, 2002 GMC Savana Camper Special, and 2002 GMC Savana. 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 PCM memory after a learn procedure has been performed. If the actual crankshaft position variation is not within the crankshaft position system variation compensating values stored in the PCM, DTC P0300 may set.
The crankshaft position 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 CKP sensor replacement.
- Any engine repairs which disturb the CKP sensor relationship.
If the crankshaft position system variation learn procedure cannot be performed successfully, check for the following conditions and correct as necessary:
- A damaged reluctor wheel.
- Excessive crankshaft runout.
- A damaged crankshaft.
- Interference in the signal circuit of the Crankshaft Position (CKP) sensor.
- A coolant temperature that is not within the Conditions 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.
- 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.