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Home › Buick › 2011 › Regal CXL Turbo, Automatic › Repair and Diagnosis › Engine Performance › System › Engine Controls And Fuel - 2.0L - DTC P0010 Through P0179 › DTC P0033-P0035 › Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the Q40 turbocharger bypass valve solenoid.
  2. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 1 or A and ground.
    • If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
  3. Verify that a test lamp does not illuminate between the control circuit terminal 2 or B and ground.
    • If the test lamp illuminates, test the control circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
  4. Connect a test lamp between the control circuit terminal 2 or B and the ignition circuit terminal 1 or A.
  5. Command the turbocharger bypass solenoid ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the K20 ECM.
    • If the test lamp is always OFF, test the control circuit for an open/high resistance. If the circuit tests normal, replace the K20 ECM.
  6. If the circuits test normal, test or replace the Q40 turbocharger bypass valve solenoid.
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