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Home >> Cadillac >> 2021 >> CT4 Sport, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 402 (Engine Controls And Fuel - 6.2L (LT4) - Diagnostic Information And Procedures (2 Of 3)) >> Diagnostic Information And Procedures >> DTC P0641, P0651, P0697, or P06A3 >> 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 the scan tool parameter: Sensor Reference Circuit Status & Sensor Reference 2 - 4 Circuit Status = Okay
    • If not the specified state 

      Refer to: Circuit/System Testing -

    • Go to next step: If the specified state 
  3. Verify the scan tool parameter: Sensor Reference Circuit Status & Sensor Reference 2 - 4 Circuit Status = The parameter state should not change.
    • Perform the action while monitoring the parameter:
    • Wiggle the harness and connector: B1 A/C Refrigerant Pressure Sensor
    • Wiggle the harness and connector: B22 Brake Pedal Position Sensor - If equipped
    • Wiggle the harness and connector: B23 Camshaft Position Sensor
    • Wiggle the harness and connector: B25B Clutch Pedal Position Sensor - If equipped
    • Wiggle the harness and connector: B26 Crankshaft Position Sensor
    • Wiggle the harness and connector: B37B Engine Oil Pressure Sensor
    • Wiggle the harness and connector: B65 Manifold Absolute Pressure and Intake Air Temperature Sensor
    • Wiggle the harness and connector: B105 Supercharger Air Inlet Pressure Sensor
    • Wiggle the harness and connector: B107 Accelerator Pedal Position Sensor
    • Wiggle the harness and connector: B115 Vehicle Speed Sensor - If equipped
    • Wiggle the harness and connector: M128 Turbocharger Wastegate Actuator
    • Wiggle the harness and connector: B227 Gear Position Sensor - If equipped
    • Wiggle the harness and connector: B310 Fuel Pressure and Temperature Sensor
    • Wiggle the harness and connector: K20 Engine Control Module
    • Wiggle the harness and connector: Q38 Throttle Body
    • If the parameter state changes 

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

    • Go to next step: If the parameter state does not change 
  4. 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 any DTC listed in the DTC Descriptor Category is set 

      Refer to: Circuit/System Testing

    • Go to next step: If none of the DTCs listed in the DTC Descriptor Category is set 
  5. All OK.
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