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Circuit/System Testing

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  1. Verify that the conditions listed below do not exist with the Q40 Turbocharger Bypass Solenoid Valve and the charge air bypass valve.
    • Improper routing of the vacuum hoses
    • Loose or improper connections of the vacuum hoses
    • Damaged components
    • If a condition exists 

      Repair or replace the affected component as necessary.

    • Go to next step: If none of the conditions exist 
    2. NOTE:

    The vacuum reservoir is integral to the intake manifold.

  2. Disconnect the turbocharger bypass solenoid valve vacuum supply hose at the intake manifold vacuum reservoir.
  3. Connect the GE 23738-A  to the vacuum port at the vacuum reservoir.
    4. NOTE:

    Allow engine idle to stabilize before continuing.

  4. 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 
  5. Apply 34 kPa (10 inches Hg) of vacuum to the intake manifold reservoir with the GE 23738-A  .
  6. 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 
  7. Connect the vacuum hose to the reservoir.
    8. NOTE:

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

  8. Disconnect the vacuum hose at the charge air bypass valve and connect the GE 23738-A  to the hose.
  9. Engine idling, command the Turbocharger Bypass Solenoid Valve between Active and Inactive with a scan tool.
  10. 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 
  11. Replace the charge air bypass valve.
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