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Home >> Toyota >> 2018 >> Avalon XLE >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Can Communication System (W/O Central Gateway Ecu) - Diagnostic Codes & Circuit Tests - (Except Hybrid) >> CAN COMMUNICATION SYSTEM (W/O Central Gateway ECU) >> DTC U0104: Lost Communication with Driving Support ECU [10/2014 - 10/2015] >> Procedure

DTC U0104: Lost Communication with Driving Support ECU [10/2014 - 10/2015]: Procedure

  1. RECONFIRM DTC OUTPUT 
    1. Reconfirm DTCs.

      HINT: 

      If DTC U1002 is output from Gateway of the network gateway ECU, this indicates a sub bus 2 malfunction. Troubleshoot for DTC U1002 and check for malfunctions in sub bus 2.

      Result

      Result Proceed to
      U1002 is not output from network gateway ECU (Techstream display: Gateway) A
      U1002 is output from network gateway ECU (Techstream display: Gateway) B

    B 

    Refer to DTC U1002: Lost Communication with Gateway Module (Network Gateway ECU) [10/2014 - 10/2015] )

    A 

    See step  2

  2. CHECK FOR OPEN IN CAN BUS LINES (DRIVING SUPPORT ECU ASSEMBLY BRANCH LINE) 
    1. Disconnect the cable from the negative (-) battery terminal.
    2. Disconnect the D38 driving support ECU assembly connector.
      GTY578912Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Driving Support ECU Assembly)
    3. Measure the resistance according to the value (s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      D38-39 (CA2H) - D38-17 (CA2L) Cable disconnected from negative (-) battery terminal 54 to 69 Ω

    NG 

    REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (DRIVING SUPPORT ECU ASSEMBLY) 

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL) 
    1. Measure the resistance according to the value (s) in the table below.
      GTY599801Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Driving Support ECU Assembly)

      Standard Resistance

      Tester Connection Condition Specified Condition
      D38-25 (GND) - Body ground Cable disconnected from negative (-) battery terminal Below 1 Ω
    2. Connect the cable to the negative (-) battery terminal.
    3. Measure the voltage according to the value (s) in the table below.
      GTY558279Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Driving Support ECU Assembly)

      Standard Voltage

      Tester Connection Condition Specified Condition
      D38-30 (B) - Body ground Engine switch on (IG) 11 to 14 V

    OK 

    REPLACE DRIVING SUPPORT ECU ASSEMBLY 

    Refer to REMOVAL [10/2014 - 10/2015] )

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) 

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