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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 121 (Engine Controls And Fuel - 2.0L (LSY) - Diagnostic Information And Procedures (3 Of 3)) >> Diagnostic Information and Procedures >> DTC P10BC, P2228-P2230, or P227C-P227E >> 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. Verify DTC P2228, P2229, P2230, P227C, P227D, P227E, U060F, U1346 is not set.
    • If only DTC P2228, P2229, P2230, P227C, P227D, P227E is set 

      Replace the component: B75 Mass Air Flow Sensor

    • If DTC U060F, U1319, U1346 is set and other DTCs are set 

      Refer to: DTC P0102, P0103, U060F, or U1319

    • Go to next step: If no DTC is set 
  3. Verify the scan tool parameter:
    • If not in the specified range 

      Replace the component: B75 Mass Air Flow Sensor

    • If in the specified range 
  4. Verify the following conditions do not exist:
    • B75 Mass Air Flow Sensor - Contamination of the measuring element/Cracked/Loose Clamps/Visible Damage/Water intrusion
    • O-Ring @ B75 Mass Air Flow Sensor - Leaking/Missing/Visible Damage
    • If a condition exists 

      Repair or replace as necessary

    • Go to next step: If no condition exists 
  5. Verify the scan tool parameter: Barometric Pressure Sensor & Barometric Pressure Sensor 2 = The value should not spike or drop out.

    Perform the action while monitoring the parameter:

    • Wiggle the harness and connector: B75 Mass Air Flow Sensor
    • Wiggle the harness and connector: K20 Engine Control Module
    • If the value spikes or drops out 

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

    • Go to next step: If the value does not spike or drop out 
  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 

      Repeat the procedure starting at step 2

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