Circuit Description

CKP sensor defines engine position by generating an electrical pulse each time is passes by a notch of the crankshaft reluctor wheel. PCM uses crankshaft sensor pulses for fuel delivery and spark timing.

DTC will set if extra or missing crankshaft sensor pulses are detected or time between reference pulses is too long or too short when RPM is greater than 3600 RPM or under 2600 RPM, engine run time is greater than 10 seconds, coolant temperature is greater than 149°F (65°C), TP is greater than 9.8 percent open, no ECT, TP sensor or P0125 DTC have been set. CKP sensor is continuously checked after these conditions have been met.