Crankshaft Position Sensor

The Crankshaft Position (CKP) sensor is a Hall Effect type sensor mounted at front of crankshaft. Front crankshaft hub includes a wheel with 4 slots. PCM uses CKP sensor signal to determine engine RPM. This signal is used to improve idle. If pump cam signal is lost, PCM will use crankshaft position signal data to control injection timing and fuel flow.