Diagnostic Aids
WARNING: This page is about a different car, the 2003 GMC Sonoma and 2003 Chevrolet S10 Pickup. 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, 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.
- Engine replacement.
- PCM replacement.
- A harmonic balancer replacement.
- Crankshaft replacement.
- CKP sensor replacement.
- Any engine repairs which disturb the crankshaft to CKP sensor relationship.
If the CKP 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 CKP sensor.
- A coolant temperature that is not within the Condition For Running the DTC.
- The ignition switch is in the ON position until the battery is drained.
- A PCM power disconnect with ignition ON may erase the stored value and set DTC P1336.