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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 125 (Engine Controls And Fuel - 3.6L (LF4) - Diagnostic Information And Procedures (2 Of 3)) >> Diagnostic Information and Procedures >> DTC P0243, P0245-P0247, P0249, P0250, P0658, P0659, P2670, or P2671 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition - On / Vehicle - In Service Mode
  2. Engine - Idling
  3. Perform the appropriate scan tool control function: Turbocharger Wastegate Position - Command the component to the maximum position/speed & Release Control

    Verify the scan tool parameter:

    • Turbocharger Wastegate Control Circuit High Test Status = Not Run or Okay
    • Turbocharger Wastegate Control Circuit Low Test Status = Not Run or Okay
    • Turbocharger Wastegate Control Circuit Open Test Status = Not Run or Okay
    • Turbocharger 2 Wastegate Control Circuit High Test Status = Not Run or Okay
    • Turbocharger 2 Wastegate Control Circuit Low Test Status = Not Run or Okay
    • Turbocharger 2 Wastegate Control Circuit Open Test Status = Not Run or Okay
    • If not the specified state 

      Refer to: Circuit/System Testing

    • Go to next step: If the specified state 
  4. Perform the appropriate scan tool control function: Turbocharger Wastegate Position - Command the component to the maximum position/speed & Release Control

    Perform the action while monitoring the parameter:

    • Turbocharger Wastegate Control Circuit High Test Status = Not Run or Okay
    • Turbocharger Wastegate Control Circuit Low Test Status = Not Run or Okay
    • Turbocharger Wastegate Control Circuit Open Test Status = Not Run or Okay
    • Turbocharger 2 Wastegate Control Circuit High Test Status = Not Run or Okay
    • Turbocharger 2 Wastegate Control Circuit Low Test Status = Not Run or Okay
    • Turbocharger 2 Wastegate Control Circuit Open Test Status = Not Run or Okay
      • Wiggle the harness and connector: K20 Engine Control Module
      • Wiggle the harness and connector: Q42A Turbocharger 1 Wastegate Solenoid Valve
      • Wiggle the harness and connector: Q42B Turbocharger 2 Wastegate Solenoid Valve
    • If not the specified state 

      Repair as necessary - Wiring / Terminal (s) / Electrical Connector (s)

    • Go to next step: If the specified state 
  5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

    Verify the DTC does not set.

    • If the DTC sets 

      Refer to: Circuit/System Testing

    • Go to next step: If the DTC does not set 
  6. All OK.
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