Camshaft Position Sensor: Testing and Inspection

Note:
- For this test, an analog voltmeter is needed.
- Do not remove the distributor connector from the distributor.
- Insert the voltmeter leads into the backside of the distributor wire harness connector to make contact with the terminals.
- Ensure that the connector is not damaged when inserting the tester probes.


Procedure

1. Insert the positive (+) voltmeter lead into the sensor output wire.
Wire colors will be tan with yellow tracer.
This is at the distributor wire harness connector.

2. Install the negative (-) voltmeter lead into the ground wire.
Wire colors will be black with blue tracer.
This is at the distributor wire harness connector.

3. Set the voltmeter on a 15 Volt DC scale. With the distributor cap removed, rotate the engine until the pulse ring enters the sensor pickup. Turn the ignition key to the ON position.
- With the pulse ring positioned in the sensor pickup the voltmeter should show approximately 5.0 volts. If voltage is not present, check the voltmeter leads for a good connection.

4. If voltage is still not present, check for voltage at the supply wire (orange wire).
a. If voltage is not present at supply wire, remove the PCM. Check for voltage at pin 7 and ground with harness connected.
b. If voltage is still not present, perform vehicle test using the DRB II Diagnostic Tester.
c. If voltage is present at the supply wire replace the sensor.

5. If voltage is present at pin 7 but not at the supply wire:
a. Check continuity between the supply wire.
This is the orange wire.
Check between the distributor connector and pin 7 at the PCM.
If continuity is not present, repair the harness as necessary.

b. Check for continuity between the output wire and pin 44 at the PCM.
Wire colors will be tan with yellow tracer at the distributor connector.
If continuity is not present, repair the harness as necessary.

c. Check for continuity between the ground circuit wire at the distributor connector and ground. If continuity is not present, repair the harness as necessary.

6. While observing the voltmeter, crank the engine. The voltmeter needle should fluctuate between 0 and 5 volts while the engine is cranking. This shows that the stator in the distributor is operating properly and a sync pulse (signal) is being generated.
- If sync pulse is not present, replacement of the camshaft position sensor is necessary.