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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 10 (ENGINE CONTROL SYSTEM & FUEL SYSTEM - 6.6L (LMM) - DTC P0016 TO DTC P0299)DTC P003ACIRCUIT/SYSTEM TESTING
2008 Chevrolet Chevy Express G3500, Van Passenger Extended

Circuit/System Testing

2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Circuit/System Testing
WARNING: This page is about a different variant/trim than selected.
IMPORTANT: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.
  1. Ignition OFF, for 90 seconds, disconnect the harness connector at the TC control solenoid.
  2. Connect the J 34730-405  between the high control terminal A and the low control circuits terminal B.
    3. 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.
  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. IMPORTANT: The resistance of the TC control solenoid will vary with the temperature.
  4. Ignition OFF, measure the resistance of the TC control solenoid. The reading should be between 3-7 ohms.
    • If the resistance is not within the specified range, replace the TC control solenoid.
  5. Test for infinite resistance between each TC control solenoid terminal and the TC control solenoid housing.
    • If less than infinite resistance, replace the TC control solenoid.
  6. Disconnect the harness connectors at the ECM, and TC vane position sensor.
  7. Test for less than 5 ohms on all circuits between the following terminals:
    • The ECM C1 TC solenoid high control circuit terminal 48 to TC control solenoid terminal A.
    • The ECM C1 TC solenoid low control circuit terminal 96 to TC control solenoid terminal B.
    • The ECM C1 TC sensor signal circuit terminal 20 to TC position sensor terminal B.
    • The ECM C1 TC sensor low reference terminal 63 to TC position sensor terminal C.
    • The ECM C1 TC sensor 5-volt reference terminal 13 to TC position sensor terminal D.
    • If greater than the specified range, repair the high resistance in the affected circuit.
  8. Connect the ECM connectors. Test the TC vane position sensor. Refer to Component Testing  in this document for instructions.
  9. Install and connect the TC vane position sensor.
  10. Command the turbocharger TC Vane Position Sensor from 0 percent to 100 percent while observing the TC Vane Position Sensor Volts parameter. The voltage should increment smoothly and gradually from approximately 1.0 V at 0 percent to greater than 3.5 V at 100 percent.
    • If the voltage parameter does not change gradually and smoothly, replace the TC control solenoid.
  11. Inspect the turbocharger for debris, damage, or sticking vanes. Refer to Turbocharger Cleaning and Inspection .
  12. If all circuits, the TC control solenoid, and the TC vane position sensor tests are normal, replace the turbocharger assembly.
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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.