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Home >> Lexus >> 2021 >> ES 350 F Sport >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Can Communication System (Except Hybrid) - Circuit Tests (1 Of 4) & Diagnostic Codes >> CAN COMMUNICATION SYSTEM (for Gasoline Model) >> DTC B1003: ECU Malfunction [06/2018 - ] >> Procedure

DTC B1003: ECU Malfunction [06/2018 - ]: Procedure

  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 [06/2018 - 08/2021]  , or refer to  REMOVAL [08/2021 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

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