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Home >> Toyota >> 2022 >> Corolla Cross L, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 97 (Can Communication System (HEV) - Circuit Tests (1 Of 5) & Diagnostic Codes) >> CAN COMMUNICATION SYSTEM (for HEV Model) >> DTC B1020-04: Central Gateway ECU System Internal Failure [11/2022 - ] >> Procedure

DTC B1020-04: Central Gateway ECU System Internal Failure [11/2022 - ]: Procedure

WARNING: This page is about a different car, the 2025 Toyota Corolla Cross, 2024 Toyota Corolla Cross, and 2023 Toyota Corolla Cross. However, it is still accessible from the selected car via links, so may be relevant.
  1. RECONFIRM DTC OUTPUT 

    Body Electrical > Central Gateway > Trouble Codes 

    Result

    Result Proceed to
    B1020-04 is output A
    B1020-04 is not output B

    Result: 

    A 

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

    Result: 

    B 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2021 - ] 

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