DTC P1336:Crankshaft Position System Variation Not Learned: Description

Crankshaft Position (CKP) system variation learning feature is used to calculate the reference period errors that are caused by slight tolerance variations in crankshaft, and in CKP sensors. Calculated error allows the Powertrain Control Module (PCM) to accurately compensate for reference period variations. This procedure enhances the ability of the PCM to detect misfire events over a wider range of engine speed and load conditions. PCM stores CKP system variation values after a learn procedure has been performed. Diagnostic Trouble Code (DTC) P1336 indicates CKP system variation values have not been stored in the PCM, and CKP system variation learn procedure must be performed. CKP system variation learn procedure must be performed any time the following service procedures are performed, regardless if DTC P1336 is set or not:

• PCM replacement.
• PCM reprogrammed.
• Engine replacement.
• Crankshaft replacement.
• CKP sensor replacement.
• Any engine repairs which disturbs crankshaft to crankshaft position sensor relationship.

DTC will set if PCM has not successfully learned crankshaft position system variation.