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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls And Fuel - 2.0L (LTG) - DTC P0010 To DTC P0333 >> Diagnostic Information and Procedures >> DTC P0234 or P0299: Engine Boost >> Circuit/System Testing

Circuit/System Testing

  1. Verify the conditions listed below do not exist:
    • Loose clamps, cracks or other damage in the air intake duct system
    • Collapsed or restricted intake duct system
    • Restricted air filter
    • Any air flow restriction
    • Any air leak between the turbocharger and the throttle body, including the charge air cooler assembly
    • Splits, kinks or improper connections at the vacuum hoses
    • Any vacuum leak
    • Restricted, leaking or incorrect routing of hoses going to the components listed below:
      • Q42 Turbocharger Wastegate Solenoid Valve
      • Turbocharger wastegate actuator
      • Turbocharger
    • Missing, restricted or leaking exhaust components. Refer to Symptoms - Engine Exhaust .
    • Exhaust leak between the turbocharger and the exhaust manifold
    • Restricted or leaking turbocharger oil supply line
    • Loose or incorrect installation of any components
    • If a condition exists 

      Repair or replace the affected component as necessary.

    • If none of the conditions exist 
  2. Ignition Off, disconnect the turbocharger wastegate solenoid valve supply hose at the turbocharger and apply 51 kPa (15 inches Hg) of vacuum to the hose with the GE 23738-A  , ignition On.
  3. Verify the pressure decreases to 0 kPa (0 inches Hg) when commanding the Turbocharger Wastegate Solenoid Valve to 15% with a scan tool.
    • The pressure does not decrease to 0 kPa (0 inches Hg) 

      Replace the Q42 Turbocharger Wastegate Solenoid Valve

    • The pressure decreases to 0 kPa (0 inches Hg) 
  4. Connect the turbocharger wastegate solenoid valve supply hose to the turbocharger.
  5. Disconnect the hose from the turbocharger wastegate actuator and connect the exhaust/pressure port of the GE 23738-A  , or a suitable hand pressure pump, to the actuator.
  6. Verify the wastegate actuator rod moves when applying pressure to the actuator.
    • If the actuator does not move 
    1. Disconnect the wastegate actuator arm from the wastegate.
    2. Verify the wastegate actuator rod moves when applying pressure to the actuator.
      • If the actuator does not move, replace the turbocharger wastegate actuator.
      • If the actuator moves, replace the turbocharger.
    • If the actuator moves 
    7. NOTE:

    Leave harness connector connected or re-connect it after removing valve.

  7. Ignition Off, remove the Q40 Turbocharger Bypass Solenoid Valve from the turbocharger, ignition On.
  8. Verify the Q40 Turbocharger Bypass Solenoid Valve plunger retracts and extends when commanding the Turbocharger Bypass Solenoid Valve between Active and Inactive with a scan tool.
    • The valve plunger does not retract and extend 

      Replace the Q40 Turbocharger Bypass Solenoid Valve

    • The valve plunger retracts and extends 
  9. Verify the conditions listed below do not exist with the turbocharger assembly. Refer to Turbocharger Cleaning and Inspection
    • Cracked, damaged or worn turbine blades
    • Restricted wastegate, turbine, ports or passages
    • Foreign material
    • A condition exists 

      Repair or replace the turbocharger as necessary

    • None of the conditions exist 
  10. Replace the turbocharger.
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