Theory Of Operation
WARNING: This page is about a different car, the 2014 Fiat 500c and 2014 Fiat 500. However, it is still accessible from the selected car via links, so may be relevant.
The Crankshaft Position System learn feature is used to calculate reference errors caused by slight tolerance variations in the crankshaft, tone wheel and the crankshaft position 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 CKP System variation values are not learned and stored in the PCM memory, DTC P0315 sets. If the actual crankshaft variation is not within the CKP systems window stored in the PCM, DTC P1300 sets and the values are not learned.