See Figures 1 and 2
The CKP sensor provides a signal through the ignition module which the PCM uses as a reference to calculate RPM and crankshaft position.
The best method to test this sensor is by using an oscilloscope.
- Visually check the connector, making sure it is connected properly and all of the terminals are straight, tight and free of corrosion.
- If a Tech 1® or equivalent scan tool is available, scan the CKP or RPM parameter while cranking the engine. If signals are indicated, the CKP sensor is functioning properly.
- If the scan tool is not available, use a digital multimeter set to the ohms setting, then check the resistance across the sensor terminals. The resistance should measure about 500-1200 ohms at about 70° F. The resistance will vary with temperature.
ON and the engine OFF .
- Using a thin piece of steel, check the tip of the sensor to see if it is magnetized.
- Using a digital multimeter set to the millivolts AC scale, connect the test probes to the sensor.
- Rotate the reluctor ring to activate the sensor signal. Use the starter to crank the engine.
- Voltage should be seen as the reluctor ring is rotated. If the reluctor is rotated quickly, a signal of at least 200 millivolts AC should be seen.
- If the sensor and circuits are functional, the PCM may be faulty.
REMOVAL & INSTALLATION
VIN J Engine
See Figure 3
- Disconnect the negative battery cable.
- Raise and safely support the vehicle.
- Unfasten any necessary retainers, then remove CKP sensor shield.
- Detach the CKP sensor electrical connector.
- Unfasten the CKP sensor mounting bolt, then remove the sensor from the vehicle.
- If equipped, remove the sensor shim.
- Lubricate the CKP sensor O-ring with clean engine oil. If used, install the sensor shim.
- Position the CKP sensor and install the mounting bolt. Tighten the bolt to 71 inch lbs. (8 Nm).
- Attach the sensor electrical connector.
- Install the CKP sensor shield, securing with the retainers as necessary.
- Carefully lower the vehicle, then connect the negative battery cable.