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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 25 (ENGINE CONTROLS - 6.6L - DIAGNOSIS (DTCs P0016-P0401)) >> DTC P003A >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
NOTE: 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. Ignition ON, verify that a test lamp illuminates between the TC high control circuit terminal A and ground.
    • If the test lamp does not illuminate, test the high control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
  3. Connect the J 34730-405  between the high control terminal A and the low control circuits terminal B.
    NOTE: 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 ECM is attempting a TC Learn, the test lamp will flash ON and OFF without commands from a scan tool.
  4. 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, replace the ECM.
    • If the test lamp remains illuminated, test the low control circuit terminal B for a short to ground. If the circuit tests normal, replace the ECM.
      NOTE: Note: The resistance of the TC control solenoid will vary with the temperature.
  5. Ignition OFF, measure the resistance of the TC control solenoid. The reading should be between 3-7U.
    • If the resistance is not within the specified range, replace the TC control solenoid.
  6. 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.
  7. Disconnect the harness connectors at the ECM, and TC vane position sensor.
  8. Test for less than 5 U on all turbocharger sensor and solenoid circuits between the following terminals:
    • The ECM X1 TC solenoid high control circuit terminal 48 to TC control solenoid terminal A.
    • The ECM X1 TC solenoid low control circuit terminal 96 to TC control solenoid terminal B.
    • The ECM X1 TC sensor signal circuit terminal 20 to TC position sensor terminal B.
    • The ECM X1 TC sensor low reference terminal 63 to TC position sensor terminal C.
    • The ECM X1 TC sensor 5 V reference terminal 13 to TC position sensor terminal D.
      • If greater than the specified range, repair the high resistance in the affected circuit.
  9. Connect the ECM connectors. Test the TC vane position sensor. Refer to Component Testing  in this document for instructions.
  10. Install and connect the TC vane position sensor.
  11. 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.
  12. Inspect the turbocharger for debris, damage, or sticking vanes. Refer to Turbocharger Cleaning and Inspection .
  13. If all circuits, the TC control solenoid, and the TC vane position sensor tests are normal, replace the turbocharger assembly.
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