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Home >> Toyota >> 2022 >> Corolla XLE >> Repair and Diagnosis >> External Pages >> Different car >> Section 444 (Can Communication System (Except HEV) (Early 2023, Except TMC) - Circuit Tests (1 Of 2) & Diagnostic Codes) >> CAN COMMUNICATION SYSTEM (for Gasoline Model except TMC Made) >> DTC B1003: ECU Malfunction [09/2022 - 11/2022] >> Procedure

DTC B1003: ECU Malfunction [09/2022 - 11/2022]: Procedure

WARNING: This page is about a different car, the 2023 Toyota GR Corolla and 2023 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.
  1. RECONFIRM DTC OUTPUT 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / Central Gateway / Trouble Codes.

      Body Electrical > Central Gateway > Trouble Codes 

      Result

      Result Proceed to
      DTC B1003 is not output from the central gateway ECU (network gateway ECU) A
      DTC B1003 is output from the central gateway ECU (network gateway ECU) B

    Result: 

    A 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [06/2018 - ] 

    Result: 

    B 

    REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU). Refer to  REMOVAL [09/2022 - 11/2022] 

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