See Figure 1
The Crankshaft Position (CKP) sensor, located on the front cover (near the crankshaft pulley) is used to determine crankshaft position and crankshaft rpm. The CKP sensor is a reluctance sensor which senses the passing of teeth on a sensor ring because the teeth disrupt the magnetic field of the sensor. This disruption creates a voltage fluctuation, which is monitored by the PCM.
See Figures 2 and 3
Using a DVOM set to the DC scale to monitor less than 5 volts, measure the voltage between the sensor Cylinder Identification (CID) terminal and ground by backprobing the sensor connector. If the connector cannot be backprobed, fabricate or purchase a test harness. The sensor is okay if the voltage reading varies more than 0.1 volt with the engine running at varying RPM.
REMOVAL & INSTALLATION
See Figures 4 through 8
- Disconnect the negative battery cable.
- Disengage the wiring harness connector from the CKP sensor.
- Loosen the CKP sensor mounting stud/bolts, then separate the sensor form the engine front cover.
When installing a new sensor on the 4.0L (VIN X and E), position the sensor against the crankshaft damper. There are small rub tabs which wear off and allow the sensor to be perfectly spaced from the damper.
- Position the sensor against the engine front cover, then install the mounting stud/bolts. Tighten them until snug.
- Install the CKP sensor cover and retaining nuts; tighten the nuts until snug.
- Reattach the wiring harness connector to the CKP sensor.
- Connect the negative battery cable.