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Home >> Toyota >> 2021 >> RAV4 Limited, 4WD >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Can Communication System (Except HV) - Circuit Tests (1 Of 4) & Diagnostic Codes >> CAN COMMUNICATION SYSTEM (for Gasoline Model) >> ECM Communication Stop Mode [12/2021 - ] >> Procedure

ECM Communication Stop Mode [12/2021 - ]: Procedure

  1. CHECK FOR OPEN IN CAN BUS WIRE (ECM MAIN WIRE) 
    1. Disconnect the cable from the negative (-) battery terminal.
    2. Disconnect the ECM connector.
      GTY839405Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to ECM)
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A24-8 (CANH) - A24-18 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR 

    Result: 

    OK 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) 
    1. Measure the resistance according to the value(s) in the table below.
      GTY839387Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to ECM)

      Standard Resistance

      Tester Connection Condition Specified Condition
      A24-45 (EC) - Body ground Cable disconnected from negative (-) battery terminal Below 1 Ω
      A24-10 (E1) - Body ground Cable disconnected from negative (-) battery terminal Below 1 Ω
      A24-36 (E2) - Body ground Cable disconnected from negative (-) battery terminal Below 1 Ω
      A24-54 (E1D1) - Body ground Cable disconnected from negative (-) battery terminal Below 1 Ω
    2. Reconnect the cable to the negative (-) battery terminal.
      NOTE:

      When disconnecting the cable, some systems need to be initialized after the cable is reconnected.

      Refer to INITIALIZATION [12/2021 - 10/2022] , or refer to INITIALIZATION [10/2022 - 10/2023] , or refer to INITIALIZATION [10/2023 - ]

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A24-1 (BATT) - Body ground Always 11 to 14 V
      A24-9 (+B) - Body ground Terminal A24-15 (MREL) connected to body ground 11 to 14 V
      A24-35 (+B2) - Body ground Terminal A24-15 (MREL) connected to body ground 11 to 14 V
      A24-2 (IGSW) - Body ground Ignition switch ON 11 to 14 V
      Ignition switch off Below 1 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE ECM 

    Refer to REMOVAL [08/2020 - 10/2022] , or refer to REMOVAL [10/2022 - 10/2023] , or refer to REMOVAL [10/2023 - ]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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