Circuit Description

Crankshaft Position (CKP) sensor is a magnetic generator type sensor. CKP sensor is located near crankshaft pulley. CKP sensor produces an alternating current signal which increases in both frequency and amplitude as engine RPM increases. CKP sensor sends a reference signal to PCM indicating crankshaft RPM and position. PCM uses CKP reference signal along with Camshaft Position (CMP) sensor signal, to calculate fuel injection pulse, determine TDC for ignition timing, and establish a starting point for ignition coil and injection sequencing. There will be not spark or fuel delivery if CKP sensor signal is not present. DTC will set when engine is cranking and no signal from CKP sensor signal for 2 seconds. When DTC sets, MIL will illuminate. PCM will record operating conditions at time of diagnostic failure and store information in FREEZE FRAME/FAILURE RECORDS data buffer.