Circuit Description

The Crankshaft Position (CKP) sensor is a variable reluctance sensor. The CKP sensor indicates the crankshaft speed and position. The CKP sensor produces an AC voltage of different amplitude and frequency. The frequency depends on the velocity of the crankshaft. The AC voltage output depends on the CKP and battery voltage. The Engine Control Module (ECM) uses a pull-up voltage of 2.5 volts on each CKP sensor circuit for reduction of noise interference from electromagnetic generating devices. The CKP sensor works in conjunction with a 58-tooth reluctor wheel on the crankshaft. The CKP sensor connects to the ECM through the CKP sensor high circuit and CKP sensor low circuit. If ECM detects less than 58 reference pulses, DTC P0337 sets.