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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 240 (Engine Controls And Fuel - 2.0L (LSY) - Diagnostic Information And Procedures (1 Of 3)) >> Diagnostic Information and Procedures >> DTC P0030-P0032, P0036-P0038, P0054, P0135, P0141, P103B, or P103C >> 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. Engine - Idling - At normal operating temperature
    2. NOTE:

    This step only applies to the following component DTCs: Heated Oxygen Sensor Heater

  2. Verify DTC P103B, P103C is not set and no other DTCs are set.
    • If DTC P103B, P103C is set and other DTCs are set 

      Refer to: Circuit/System Testing - Test 1

    • If DTC P103B, P103C is not set and other DTCs are set 

      Refer to: Circuit/System Testing - Test 1

    • If DTC P103B, P103C is set and no other DTCs are set 

      Refer to: Circuit/System Testing - Test 2

    • Go to next step: If no DTC is set 
  3. Verify the scan tool parameter:
    • Heated Oxygen Sensor Heater Control Circuit High Test Status = Not Run or Okay
    • Heated Oxygen Sensor Heater Control Circuit Low Test Status = Not Run or Okay
    • Heated Oxygen Sensor Heater Control Circuit Open Test Status = Not Run or Okay
    • Heated Oxygen Sensor 2 Heater Control Circuit High Test Status = Not Run or Okay
    • Heated Oxygen Sensor 2 Heater Control Circuit Low Test Status = Not Run or Okay
    • Heated Oxygen Sensor 2 Heater Control Circuit Open Test Status = Not Run or Okay
    • If not the specified state 

      Refer to: Circuit/System Testing - Test 1

    • Go to next step: If the specified state 
  4. Verify the scan tool parameter:
    • Heated Oxygen Sensor Heater = 0.3 to 4.0 A
    • Heated Oxygen Sensor 2 Heater = 0.3 to 2.5 A
    • If not in the specified range 

      Refer to: Circuit/System Testing - Test 1

    • Go to next step: If within the specified range 
  5. Verify the scan tool parameter: Heated Oxygen Sensor Heater or Heated Oxygen Sensor 2 Heater = The parameter value should not change

    Perform the action while monitoring the parameter:

    • Wiggle the harness and connector: B52 Heated Oxygen Sensor
    • Wiggle the harness and connector: K20 Engine Control Module
    • If the parameter value changes 

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

    • Go to next step: If the parameter value does not change 
  6. 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 step 2

    • Go to next step: If the DTC is not set 
  7. All OK.
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