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Home >> Chevrolet >> 2006 >> Monte Carlo LTZ >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 3.9L - DTC P0442 To DTC P2A01 >> DTC P0660 >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition ON, measure for battery voltage between the IMT valve ignition voltage circuit and ground. Battery voltage should be measured.
    • If less than battery voltage test the ignition voltage circuit for an open, high resistance or short to ground, if shorted to ground replace the fuse that supplies the voltage.
  2. Connect a test lamp between the IMT valve ignition voltage circuit and ground circuit at the IMT valve harness connector. The test lamp should illuminate.
    • If The test lamp does not illuminate, test the ground circuit for an open or high resistance.
  3. Ignition ON, disconnect the IMT valve harness connector and measure for 0.5 volt on the variable tuning signal circuit and ground.
    • If less than 0.5 volt, test the variable tuning signal circuit for an open or high resistance, short to ground, or a faulty control module.
    • If more than 0.5 volt, test the variable tuning signal circuit for a short to voltage or a faulty control module.
  4. Measure for 5.0 volts on the IMT fan position signal circuit at the IMT valve harness connector.
    • If more than 5 volts, test the IMT fan position signal circuit for a short to voltage.
    • If less than 5 volts, test the IMT fan position signal circuit for an open, high resistance, or short to ground.
    • If all circuits test OK, replace the IMT valve.
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