Theory Of Operation

The Crankshaft Position System learn feature is used to calculate reference errors caused by slight tolerance variations in the Crankshaft, Target Wheel, and the Crankshaft Position (CKP) sensors. The calculated error allows the Powertrain Control Module (PCM) to accurately compensate for reference variations. The Crankshaft Position System variation compensating values are learned and stored in the PCM memory during a Decel Fuel Shutoff event. If the Crankshaft Position System variation values are not learned and stored in the PCM memory, DTC P0315 sets. If the actual Crankshaft variation is not within the Crankshaft Position systems window stored in the PCM, DTC P1300 sets and the values are not learned.