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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 403 (Engine Controls And Fuel - 3.0L (LGY) - Diagnostic Information And Procedures (3 Of 3)) >> Diagnostic Information and Procedures >> Cylinder Deactivation (Active Fuel Management) 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.
    NOTE:

    The engine oil level and the oil pressure are critical to the correct operation of the system.

  1. Verify no other DTCs are set.
    • Go to next step: If no other DTCs are set 
  2. Verify the condition does not exist: Engine Oil - Fill Level = Low
    • If a condition exists 

      Repair or replace as necessary

    • Go to next step: If no condition exists 
  3. Verify the engine oil pressure: Refer to: Oil Pressure Diagnosis and Testing
    • If not in the specified range 

      Repair or replace as necessary

    • Go to next step: If in the specified range 
  4. Engine - Idling - At normal operating temperature - Verify there is no abnormal noise from the component:
    • Go to next step: If no abnormal noise is present 
  5. Refer to: Circuit/System Testing
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