DTC P1336: Crankshaft Position System Variation Not Learned: Description

The Crankshaft Position (CKP) system variation learning feature is used to calculate reference period errors caused by slight tolerance variations in crankshaft, crankshaft balancer interrupter rings, and crankshaft position sensor hall effect switches. The calculated error allows PCM to accurately compensate for reference period variations. The crankshaft position system variation learning feature enhances the ability of the PCM to detect misfire events over a wider range of engine speed and load.

The crankshaft position system variation values are stored in the PCM non-volatile memory after the crankshaft position system variation learn procedure has been performed. DTC indicates that crankshaft position system variation values have not been stored in the PCM and crankshaft position system variation learn procedure must be performed. The learn procedure is required after PCM replacement, engine replacement, crankshaft replacement, crankshaft balancer replacement, CKP sensor replacement, any engine repairs which disturbs crankshaft/harmonic balancer-to-crankshaft position sensor relationship.