Crankshaft Position (CKP) Sensor

The CKP sensor is a hall effect sensor mounted at the rear of the engine block, adjacent to a trigger wheel located on the crankshaft. The trigger wheel is a 60 minus 2 steel disk with 58 evenly spaced magnetic indicators and a minus 2 indicator slot spaced for each 6 degrees of crank angle. As the crankshaft rotates, the CKP sensor produces a square wave for each magnetic indicator edge of the trigger wheel and it detects the missing 59th and 60th magnetic indicator. This configuration allows the CKP sensor to provide the PCM with the angular position of the crankshaft relative to a fixed reference for the CKP sensor. The PCM uses the CKP sensor input to calculate engine RPM, fuel timing, fuel quantity and duration of the fuel injection.