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Home >> Cadillac >> 2021 >> CT4 Sport, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 401 (Engine Controls And Fuel - 3.0L (LGY) - Diagnostic Information And Procedures (2 Of 3)) >> Diagnostic Information and Procedures >> DTC P0234 or P0299 >> 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.
NOTE:

Circuit/System Verification must be performed before proceeding with Circuit/System Testing.

  1. Ignition/Vehicle - Off
  2. Perform the following procedure/test: Component/System Leak Test

    Verify the procedure/test passes.

    • If the procedure/test does not pass 

      Repair or replace as necessary

    • Go to next step: If the procedure/test passes 
  3. Verify the following conditions do not exist:
    • B65 Intake Manifold Pressure and Air Temperature Sensor - Visible Damage
    • B75C Multifunction Intake Air Sensor - Contamination of the measuring element/Visible Damage/Water intrusion
    • B111 Turbocharger Boost Sensor
      • Restricted - Moisture/Ice
      • Skewed
    • Q38 Throttle Body
      • Coking/Loose Clamps/Visible Damage
      • Restricted - Moisture/Ice
    • Air Cleaner Element - Dirty/Restricted
    • Catalytic Converter & Exhaust System - Blocked/Leaking/Restricted/Visible Damage - Refer to: Symptoms - Engine Exhaust
    • Charge Air Cooler - Restricted/Moisture/Ice
    • Intake Air Duct - Collapsed/Restricted/Visible Damage
    • Intake Manifold - Restricted/Visible Damage
      • NOTE:

      It may be necessary to use a scan tool control function to operate a component.

    • Linkage@M128 Turbocharger Wastegate Actuator - Binding or Sticking/Loose/Visible Damage
    • Q40 Turbocharger Bypass Valve Solenoid - Binding or Sticking/Loose/Visible Damage
    • Positive Crankcase Ventilation System - Restricted - Moisture/Ice
    • If a condition exists 

      Repair or replace as necessary

    • Go to next step: If no condition exists 
  4. Verify the following conditions do not exist: Engine - Mechanical Condition
      NOTE:

      The list is not all encompassing - Refer to: Symptoms - Engine Mechanical

    • Compressor Air Intake TurbochargerorTurbine Shaft Seal - Leaking - Engine Oil
    • Compressor Air Intake Turbocharger - Low oil pressure
    • Compressor Air Intake Turbocharger - Mechanical Condition/Worn
    • Camshaft Lobe(s) - Visible Damage/Worn
    • Exhaust ValveorIntake Valve - Stuck Open/Visible Damage
    • Exhaust Valve SeatorIntake Valve Seat - Visible Damage
    • Piston - Cracked/Visible Damage
    • Piston Ring - Seized/Visible Damage/Worn
    • If a condition exists 

      Repair or replace as necessary

    • Go to next step: If no condition exists 
  5. Replace the component: Turbocharger
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