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Home >> Chevrolet >> 2017 >> Spark LT, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 97 (Engine Controls And Fuel - 1.6L (LWC) - DTC P0010 To DTC P0238) >> Diagnostic Information and Procedures >> DTC P0234 or P0299 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. However, it is still accessible from the selected car via links, so may be relevant.
  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:
      • Turbocharger wastegate solenoid valve.
      • Turbocharger bypass solenoid valve.
      • Turbocharger.
      • Turbocharger wastegate actuator.
      • Turbocharger bypass valve
    • Missing, restricted or leaking exhaust components. Refer to Symptoms - Engine Exhaust
    • Exhaust leak between the turbocharger and the exhaust manifold.
    • Restricted turbocharger oil supply line.
    • Loose or incorrect installation of any components.
    • If a condition exists 

      Repair or replace the affected component as necessary.

    • Go to next step: 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

    • Go to next step: 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 

      Replace the turbocharger

    • Go to next step: If the actuator moves 
    7. NOTE:

    The vacuum reservoir is integral to the intake manifold.

  7. Disconnect the turbocharger bypass solenoid valve vacuum supply hose at the intake manifold vacuum reservoir.
  8. Connect the GE 23738-A  to the vacuum port at the vacuum reservoir.
    9. NOTE:

    Allow engine idle to stabilize before continuing.

  9. Engine Idling, verify the vacuum gauge displays between 45 - 67 kPa (13 - 20 inches Hg) of vacuum.
    • If not within the specified range 

      Replace the intake manifold.

    • Go to next step: If within the specified range 
  10. Apply 34 kPa (10 inches Hg) of vacuum to the intake manifold reservoir with the GE 23738-A  .
  11. Verify the reservoir holds vacuum for at least 10 s.
    • If the vacuum is not held for at least 10 s 

      Replace the intake manifold

    • Go to next step: If the vacuum is held for at least 10 s 
  12. Connect the vacuum hose to the reservoir.
    13. NOTE:

    Disconnect the turbocharger bypass solenoid valve vacuum supply hose at the vacuum reservoir if not still disconnected from step 7.

  13. Disconnect the vacuum hose at the charge air bypass valve and connect the GE 23738-A  to the hose.
  14. Engine idling, command the Turbocharger Bypass Solenoid Valve between Active and Inactive with a scan tool.
  15. Verify the vacuum toggles between 0 kPa (0 inches Hg) to greater than 45 kPa (13 inches Hg).
    • If not within the specified range 

      Replace the Q40 Turbocharger Bypass Solenoid Valve

    • Go to next step: If within the specified range 
  16. Connect any hoses that were disconnected during previous steps.
  17. Verify the conditions listed below do not exist with the turbocharger assembly. Refer to Compressor Air Intake Turbocharger Cleaning and Inspection
    • Worn or damaged wastegate pivot pin
    • Cracked, damaged or worn turbine blades
    • Restricted wastegate, turbine, ports or passages
    • Foreign material
    • Damaged or restricted bypass valve assembly.
    • If a condition exists 

      Repair or replace the turbocharger as necessary

    • Go to next step: If none of the conditions exist 
  18. Replace the turbocharger.
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