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Circuit/System Testing

  1. Ignition OFF, disconnect the Camshaft Position Sensor and Actuator Magnet jumper harness connector. Refer to Inline Harness Connector End Views for connector identification.
    2. NOTE: Testing for steps 2-4 is performed on the ECM side of the jumper harness connector.
  2. Ignition OFF for 1 minute, test for less than 5 Ω between the low reference circuit terminal E and ground.
    • If greater than the specified value, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
    3. NOTE: A test lamp must be used for this test. The control circuit is pulled-up to a low current voltage, A voltage on the control circuit is normal.
  3. Ignition ON, engine OFF, verify that a test lamp does not illuminate between the control circuit terminal D and ground.
    • If the test lamp illuminates, test the control circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  4. Connect the DMM black lead to the control circuit terminal D. Connect the DMM red lead to B+. Set the DMM on the diode setting. Command the CMP actuator solenoid ON and OFF with a scan tool. The DMM should transition from OL when commanded OFF to less than 1 V when commanded ON.
    • If the circuit voltage does not correspond to the specified values, test the control circuit for an open/high resistance or a short to ground. If the circuit tests normal, replace the ECM.
    5. NOTE: Testing for steps 5 and 6 is performed on the engine side of the jumper harness connector.
  5. Ignition OFF, test for infinite resistance between the control circuit terminal D and ground.
    • If not the specified value, repair the control circuit for a short to ground.
  6. Test for 5.0-9.0 Ω between the control circuit terminal D and the low reference circuit terminal E.
    • If less than the specified range, test for a short between the control circuit and the low reference circuit. If the circuits/connections test normal, test or replace the Camshaft Position Actuator Magnet.
    • If greater than the specified range, test the control circuit and the low reference for an open/high resistance. If the circuits/connections test normal, test or replace the Camshaft Position Actuator Magnet.
  7. Remove the Camshaft Position Actuator Magnet. Perform the Camshaft Position Actuator Magnet Cleaning and Inspection . The Camshaft Position Actuator Magnet should pass the inspection.
    • If the inspection fails, replace the Camshaft Position Actuator Magnet.
  8. Perform the Camshaft Position Actuator Solenoid Valve Inspection (On-Vehicle) or Camshaft Position Actuator Solenoid Valve Inspection (Off-Vehicle) . The Camshaft Position Actuator Solenoid Valve should pass the inspection.
    • If the inspection fails, replace the Camshaft Position Actuator Solenoid Valve.
  9. If all circuits and components test normal, replace the mechanical Camshaft Position Actuator.
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