Crankshaft Position Sensor (CKPS)
Crankshaft Position Sensor (CKPS) is a magnetic-type sensor that generates voltage using a sensor and a target wheel mounted on the crankshaft; there are 58 slots in the target wheel where one slot is longer than the other. When the slot in the wheel aligns with the sensor, the sensor output voltage will be low. When a metal (tooth) in the wheel aligns with the sensor, the sensor output voltage will be high. During one crankshaft rotation there are 58 rectangular signals and one longer signal. The engine Electronic Control Unit (ECU) calculates engine RPM based on the sensor's signal and controls the fuel injection duration and the ignition timing. Using the signal differences caused by the longer slot, the engine ECU identifies which cylinder is at Top Dead Center (TDC).