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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 404 (Engine Controls And Fuel - 6.2L (LT4) - Diagnostic Information And Procedures (3 Of 3)) >> Diagnostic Information And Procedures >> Boost Control System Diagnosis >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2022 Cadillac CT5. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition off.
  2. Disconnect the boost signal hose from the Supercharger Bypass Valve Actuator, and connect the GE-23738-A  to the hose barb.
  3. Verify the Supercharger Bypass Valve Actuator rod retracts and maintains 47.4 kPa (14 in Hg) of vacuum.
    • If the rod does not retract and hold 
    1. Ignition OFF Disconnect the actuator rod from the actuator linkage.
    2. Verify the supercharger bypass valve actuator rod retracts and maintains 47.4 kPa (14 in Hg) of vacuum.
      • If the rod does not retract, replace the Supercharger Bypass Valve Actuator.
      • Go to next step: If the rod retracts
    3. Verify the bypass valve linkage moves freely in Supercharger housing.
      • Go to next step: If the bypass valve linkage moves freely in Supercharger housing.
    4. Replace the Supercharger Bypass Valve Actuator
    • Go to next step: If the rod retracts 
  4. Connect the GE-23738-A  to the boost signal port at the supercharger.
  5. Engine idling.
  6. Verify vacuum is 47.4 kPa (14 in Hg) or greater
    • If less than 47.4 kPa (14 in Hg) 

      Repair or replace components as necessary.

    • Go to next step: If 47.4 kPa (14 in Hg) or greater 
  7. Replace the Supercharger Bypass Valve Actuator Boost Signal Hose.
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