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Circuit/System Testing

IMPORTANT: You must complete the Circuit/System Verification before proceeding with Circuit/System Testing.
  1. Ignition OFF, disconnect the CMP actuator solenoid harness connector at the CMP actuator solenoid.
  2. Test for less than 1 ohm of resistance between the low reference circuit terminal 2 and ground.
    • If greater than 1 ohm, test the low reference for an open/high resistance. If the circuit tests normal replace the ECM.
  3. Connect a test lamp between the high control circuit terminal 1 and the low reference circuit terminal 2 harness connector.
  4. Command the CMP actuator solenoid ON and OFF. The test lamp should turn ON and OFF when changing between commanded states.
    • If the test lamp is always ON, test the high control circuit for a short to voltage. If the circuit tests normal replace the ECM.
    • If test lamp is always OFF, test the control circuit for a short to ground, an open/high resistance. If the circuit tests normal replace the ECM.
  5. If all circuits test normal, test or replace the CMP Actuator solenoid.
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