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Home >> Toyota >> 2021 >> Mirai XLE >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Can Communication System - Diagnostic Codes (3 Of 3) & Circuit Tests (1 Of 8) >> Can Communication System >> FC Converter Assembly Communication Stop Mode [12/2022 - 12/2023] >> Procedure

FC Converter Assembly Communication Stop Mode [12/2022 - 12/2023]: Procedure

  1. CHECK FOR OPEN IN CAN BUS WIRE (FC CONVERTER ASSEMBLY BRANCH WIRE) 
    1. Disconnect the cable from the negative (-) auxiliary battery terminal.
    2. Disconnect the B19 FC converter assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      B19-22 (CA1H) - B19-21 (CA1L) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR 

    Result: 

    OK 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) 
    1. Disconnect the B6 FC converter assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      B6-10 (E1) - Body ground Cable disconnected from negative (-) auxiliary battery terminal Below 1 Ω
      B6-11 (E2) - Body ground Cable disconnected from negative (-) auxiliary battery terminal Below 1 Ω
    3. Reconnect the cable to the negative (-) auxiliary battery terminal.
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      B6-12 (+B1) - Body ground Ignition switch ON 11 to 14 V
      B6-13 (+B2) - Body ground Ignition switch ON 11 to 14 V
      B6-6 (IG2)- Body ground Ignition switch ON 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE FC CONVERTER ASSEMBLY. Refer to  REMOVAL [12/2022 - 12/2023] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)