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Home >> Chevrolet >> 2007 >> Chevy Express G2500, Van Cargo, 6.6 6 >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (Engine Control System & Fuel System - 6.6L (LLY) - DTC P0016 To DTC P0341) >> DTC P0045 >> Circuit/System Testing

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 the Circuit/System Testing.
  1. Ignition OFF, allow sufficient time for the ECM to power down.
  2. Disconnect the harness connector at the TC vane position solenoid.
  3. Connect the J 34730-405  between the high control and the low control circuits.
  4. Ignition ON, command the TC Van Pos. Ctrl. solenoid ON and OFF with a scan tool. The test lamp should change from Bright to Dim when changing between the commanded states.
    • If the test lamp does NOT change brightness, test the low control circuit for a short to voltage. If the circuit tests normal, test the low control and high control circuits for a short to ground or an open/high resistance. If the circuits test normal, replace the ECM.
  5. Engine running, observe the TC Vane Pos. Ctrl. Solenoid Amperage parameter for a value of 0.4-1.1 amps.
    • If the value is less than 0.4 amp, test the high control circuit for a short to voltage.
  6. Ignition OFF, disconnect the harness connectors at the ECM, TC vane position sensor, and the TC vane position solenoid.
  7. Test for less than 5 ohms of resistance on all circuits between the following terminals:
    • The ECM C1 solenoid high control circuit terminal 48 to TC solenoid terminal A
    • The ECM C1 solenoid low control circuit terminal 96 to TC solenoid terminal B
    • The ECM C1 sensor signal circuit terminal 20 to TC sensor terminal C
    • The ECM C1 sensor low reference terminal 63 to TC sensor terminal B
    • The ECM C1 sensor 5-volt reference terminal 13 to TC sensor terminal A
    • If the resistance is over 5 ohms, repair the high resistance in the affected circuit.
  8. Remove the TC solenoid from the turbocharger. Connect the ECM and the turbocharger solenoid connectors.
  9. Ignition ON, depress the button at the tip of the solenoid slightly. Command the TC Vane Pos. Ctrl. Solenoid ON while observing for the spool valve to open at the slot closest to the button.
    • If the spool valve did not operate, replace the TC solenoid.
  10. Inspect the turbocharger for debris, damage, or sticking vanes. Refer to Turbocharger Cleaning and Inspection .
  11. If all circuits, the TC vane position solenoid, and the TC vane position sensor tests normal, replace the turbocharger assembly.
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