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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 231 (Engine Controls - 3.9L - DTC P0442 To P2A01) >> DTC P2070 or P2071 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.
  1. Monitor the scan tool for any other DTCs.
    • If DTC P0660 is set, diagnose that DTC first. Refer to DTC P0660 .
  2. 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 a short to ground or a faulty control module.
  3. 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.
  4. Disconnect the engine control module (ECM) harness connector for the IMT fan position signal circuit and measure the resistance of the circuit.
    • If more than 5 ohms, repair the high resistance condition.
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