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Home >> Chevrolet >> 2007 >> Optra LS, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 1.8L (LDA) >> Diagnostic Information and Procedures >> DTC P0660 >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector of the IMT valve solenoid.
    2. IMPORTANT: The test lamp is used to load the circuit and may not illuminate.
  2. Connect a test lamp between the ignition 1 voltage circuit of the IMT valve solenoid and ground.
  3. Ignition ON, load test for battery voltage between the ignition 1 voltage circuit of the IMT valve solenoid and ground.
    • If less than B+, repair the ignition 1 voltage circuit of the IMT valve solenoid for a short to ground or an open/high resistance. Replace the fuse, if necessary.
  4. With the ignition OFF, connect a test lamp between the control circuit and the ignition 1 voltage circuit of the IMT valve solenoid.
  5. With the ignition ON, use a scan tool to command the IMT valve solenoid ON and OFF. The test lamp should turn ON and OFF with the command.
    • If the test lamp remains ON all the time, test for a short to ground on the control circuit. If circuit/connections test normal, replace the ECM.
    • If the test lamp remains OFF all the time, test for a short to voltage or an open/high resistance on the control circuit. If circuit/connections test normal, replace the ECM.
  6. If all circuits/connections test normal, replace the IMT valve solenoid.
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