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Home >> Chevrolet >> 2013 >> Impala LS >> Repair and Diagnosis >> External Pages >> Different car >> Section 233 (Engine Control System - 3.9L - DTC P0442 To DTC P2A01) >> DTC P2077 or P2078 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2006 Chevrolet Monte Carlo and 2006 Chevrolet Impala. 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 an open or high resistance, short to ground, or a faulty control module.
    • If more than 0.6 volt, test the variable tuning signal circuit for a short to voltage or a faulty control module.
  3. Measure for 5.0 volts on the IMT fan position signal circuit at the IMT valve harness connector and ground.
    • 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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