Crankshaft Position (CKP) Sensor

The PCM uses CKP input to determine engine speed. On 1.8L, the CKP sensor is incorporated with the Cylinder Identification (CID) photo sensor, mounted inside the distributor. A slotted disc rotates with the distributor shaft, passing through the photo sensor. As the slots pass through the sensor, the PCM calculates crankshaft position and engine speed. This signal affects air/fuel ratio, ignition timing and emissions.

On 2.0L A/T, CKP sensor is located in the distributor. A 4-vane rotor is mounted to distributor shaft and spins at camshaft speed. As the rotor passes through a magnetic Hall Effect switch, the PCM calculates crankshaft position and engine speed. This signal affects air/fuel ratio, ignition timing and emissions.

On 2.5L, 2 CKP sensors are used. One sensor is located within the distributor and the second sensor is mounted below the crankshaft pul-ley. On the distributor mounted CKP sensor, a 6-vane rotor is mounted to distributor shaft and spins at camshaft speed. As the rotor passes through a magnetic Hall Effect switch, the PCM calculates crankshaft position.

On CKP sensor mounted below crankshaft pulley, the sensor signal is generated directly at the crankshaft pulley. This signal is used at higher vehicle speeds when timing belt does not accurately represent crankshaft position. Input signals from both CKP sensors are sent to the PCM and used for adjusting fuel injection timing, ignition timing and emission control.