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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the Camshaft Position Actuator Magnet.
  2. Ignition OFF for 1 minute, test for less than 5 Ω between the low reference circuit terminal 2 and ground.
    • If greater than the specified range, 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 1 and ground.
    • If the test lamp illuminates, test the control circuit for short to voltage. If the circuit tests normal, replace the ECM.
  4. Connect the DMM black lead to the control circuit terminal 1. 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. Remove the Camshaft Position Actuator Magnet. Verify that none of the the following conditions exist:
    • A damaged electrical connector
    • An accumulation of dirt or debris in the area around the pintle
    • A build-up of burnt engine oil on the shaft of the pintle which may cause the pintle to stick and not move freely within the proper range of travel
    • For oil seepage at the solenoid connector
    • If a condition is found, replace the Camshaft Position Actuator Magnet.
    6. NOTE:
    • The Camshaft Position Actuator Magnet pintle should be facing downward for this test.
    • Do not allow electrical current to flow through the Camshaft Position Actuator Magnet for more than 1-2 s.
  6. Install a 20 A fused jumper wire between the control circuit terminal 1 of the Camshaft Position Actuator Magnet and 12 V. Momentarily install a jumper wire between the low reference terminal 2 of the Camshaft Position Actuator Magnet and ground. The pintle should extend.
    • If the function does not perform as specified, replace the Camshaft Position Actuator Magnet.
  7. Inspect the engine timing components and camshaft position actuator filter for being restricted or plugged. A condition should not exist. Refer to Camshaft Timing Chain and Sprocket Replacement .
    • If a condition is found, repair as necessary.
  8. If all circuits and components test normal, replace the mechanical Camshaft Position Actuator.
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