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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1046 (Engine Controls And Fuel - 6.6L - DTC P0016 To DTC P02E0) >> DTC P0047 or P0048 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the TC vane control solenoid.
    2. IMPORTANT: When the engine coolant temperature is less than 70°C (158°F), the test lamp will change brightness when commanded with a scan tool. When the engine coolant temperatures are above 70°C (158°F), the test lamp will flash ON and OFF without commands from a scan tool.
  2. Connect the J 34730-405  between the high control circuit terminal A and the low control circuit terminal B.
  3. Engine running, engine coolant temperature (ECT) sensor 1 must be less than 70°C (158°F). Command the TC Vane Pos. Ctrl. Solenoid ON and OFF with a scan tool. The test lamp should illuminate and change from bright to dim when changing between the commanded states.
    • If the test lamp does not illuminate, test the low control circuit terminal B for an open/high resistance or a short to voltage. If the circuit tests normal, test the high control circuit terminal A for a short to ground or an open/high resistance. If the circuits test normal, replace the ECM.
    • If the test lamp remains illuminated, test the low control circuit terminal B for a short to ground.
  4. Ignition OFF, test for a resistance between 2-7 ohms across the terminals of the TC vane control solenoid.
    • If the resistance is not within the specified range, replace the TC vane position solenoid.
  5. Test for infinite resistance between each terminal and the TC vane control solenoid housing.
    • If less than infinite resistance, replace the TC vane control solenoid.
  6. If all circuits test normal, replace the TC control vane control solenoid.
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