The Crankshaft Position (CKP) sensor is a variable reluctance sensor that uses a trigger wheel to induce voltage. The CKP sensor is a fixed magnetic sensor mounted to the engine block and monitors the trigger or "pulse" wheel which is attached to the crank pulley/damper. As the pulse wheel rotates by the CKP sensor, teeth on the pulse wheel induce voltage inside the sensor through magnetism. The pulse wheel has a missing tooth that changes the reading of the sensor. This is used for the Cylinder Identification (CID) function to properly monitor and adjust engine timing by locating the number 1 cylinder. The voltage created by the CKP sensor is alternating current (A/C). This voltage reading is sent to the PCM and is used to determine engine RPM, engine timing, and is used to fire the ignition coils.
Removal & Installation
- With vehicle in NEUTRAL, position it on a hoist.
- Disconnect the negative battery cable.
- Remove the 7 pin-type retainers and the right side splash shield.
- Disconnect the crankshaft position (CKP) sensor electrical connector.
- Remove the bolt and the CKP sensor.
- Installation is the reverse of removal.
- Measure the voltage between the sensor CKP sensor terminals by backprobing the sensor connector.
- If the connector cannot be backprobed, fabricate or purchase a test harness.
- Sensor voltage should be more than 0.1 volt AC with the engine running and should vary with engine RPM.
- If voltage is not within specification, the sensor may be faulty.