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. 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, in the case of the 2.5L engine, and a high spot located on the flywheel on the 2.0L engine, 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 pulse wheel on the 2.0L engine is actually the flywheel, while on the 2.5L engine the pulse wheel is located on the front of the crankshaft behind the damper and just inside the front cover. 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.
- 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.
REMOVAL & INSTALLATION
See Figures 1, 2, 3 and 4
The CKP sensor is located on the rear of the engine and is triggered by the flywheel on the 2.0L engine, and it is located on the front of the engine and is triggered by a pulse wheel behind the crankshaft damper and inside the front cover on the 2.5L engine.
- Disconnect the negative battery cable.
- Raise and support the vehicle.
- On 2.5L engine equipped models, remove the splash shield from the passenger side fenderwell.
- Unplug the sensor connector.
- Remove the CKP sensor retaining bolt and remove the sensor.
- Place the CKP sensor into position and tighten the retaining bolt to 53-80 inch lbs. (6-9 Nm) on the 2.0L engine, and 71-106 inch lbs. (8-12 Nm) on the 2.5L engine.
- Attach the sensor connector.
- On vehicles equipped with the 2.5L engine, install the splash shield.
- Lower the vehicle.
- Connect the negative battery cable.