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Camshaft Position Sensor

  1. Use an analog voltmeter. DO NOT  remove distributor connector from distributor. Insert voltmeter leads into backside of distributor wiring harness connector to make contact with terminals. Ensure connector is not damaged when inserting test probes.
  2. Insert positive voltmeter lead into camshaft position sensor signal output circuit (Tan/Yellow wire) at distributor wiring harness connector. Insert negative voltmeter lead into ground circuit (Black/Light Blue wire) at distributor wiring harness connector. Set voltmeter to 15-volt DC scale.
  3. With distributor cap removed, manually rotate engine until pulse ring enters sync signal generator on camshaft position sensor. Distributor rotor should be at 9 o'clock position. Turn ignition switch to ON position. With pulse ring positioned in the sync signal generator, reading should be approximately 5 volts.
  4. If no voltage is present, check voltmeter leads for good connections. If connections are okay and there is still no voltage, check for voltage at supply circuit (Orange wire).
  5. If no voltage is present at supply wire, remove PCM connector. Check voltage at PCM pin No. 7 and ground with wiring harness connected. PCM is located on left side of engine compartment. If there is no voltage at PCM, see appropriate camshaft position sensor circuit tests in TESTS W/CODES - 2.5L & 4.0L article in this section.
  6. If voltage is present at supply wire, replace camshaft position sensor. If voltage is present at PCM pin No. 7, but not at supply wire, check continuity of supply wire between the distributor connector and the PCM. If no continuity exists, repair wiring harness as necessary.
  7. If supply wire is okay, check continuity between camshaft position sensor signal output wire at the distributor connector and PCM pin No. 44. If no continuity exists, repair wiring harness as necessary.
  8. If camshaft position sensor signal output wire is okay, check continuity between ground circuit wire at the distributor connector and ground. If no continuity exists, repair wiring harness as necessary. If ground wire is okay, go to next step.
  9. While observing voltmeter, crank engine. Voltmeter needle should fluctuate from 0-5 volts while the engine is cranking. This verifies that camshaft position sensor in distributor is operating properly and that a sync pulse signal is being generated. If voltmeter does not fluctuate, replace camshaft position sensor.
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