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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 Verification

Circuit/System Verification

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 - On/Vehicle - In Service Mode
  2. Verify DTC P026E, P10BA, P1384, P2B83, P2B84, P30AE, P30AF, U02A9, U05AA is not set.
    • Go to next step: If none of the DTCs are set 
  3. Verify the coolant in the charge air cooler coolant reservoir is at the proper level.
  4. Verify that the vacuum lines to the supercharger components are properly routed. Refer to Compressor Air Intake Supercharger Description and Operation .
    • If a condition exists 

      Repair or replace the component as necessary.

    • Go to next step: If none of the conditions exist 
  5. Verify the conditions listed below do not exist:
    • Damaged, restricted or improperly installed Supercharger Bypass Valve Actuator.
    • Damaged, restricted or improperly installed Supercharger Bypass Valve Actuator linkage.
    • Leaks at the supercharger manifold gaskets and supercharger intake plenum.
    • Damaged or worn supercharger components or cover. Refer to Compressor Air Intake Supercharger Cleaning and Inspection (LT4)
    • Leaking or restricted vacuum hoses and connections.
      • If a condition exists 

        Repair or replace the component as necessary.

      • Go to next step: If none of the conditions exist 
  6. Verify the Supercharger Bypass Valve Actuator rod is fully extended and the bypass valve linkage is resting on the mechanical stop.
    • If the Supercharger Bypass Valve Actuator rod is not fully extended or the bypass valve linkage is not resting on the mechanical stop 

      Refer to Circuit/System Testing

    • Go to next step: If the Supercharger Bypass Valve Actuator rod is fully extended and the bypass valve linkage is resting on the mechanical stop 
  7. Engine idling.
  8. Verify the Supercharger Bypass Valve Actuator rod retracts after engine is started.
    • If the Supercharger Bypass Valve Actuator rod does not retract after the engine is started 

      Refer to Circuit/System Testing

    • Go to next step: If the Supercharger Bypass Valve Actuator rod is retracted 
  9. All OK.
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