Crankshaft Position Sensor: Description and Operation
ENGINE CONTROL COMPONENTSCrankshaft Position (CKP) Sensor
The CKP sensor is a hall effect sensor mounted at the rear of the engine block, adjacent to a pulse wheel located on the crankshaft. The pulse wheel is 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 sine wave for each magnetic indicator edge of the pulse wheel and it detects the missing 59th and 60th magnetic indicator. This configuration allows the CKP sensor to provide the powertrain control module (PCM) with the angular position of 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.
