CAN COMMUNICATION SYSTEM(for LHD), Diagnostic DTC:U1117

DTC Code DTC Name
U1117 Lost Communication with Accessory Gateway

DESCRIPTION

DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from
U1117 Lost Communication with Accessory Gateway There is no communication from the bus buffer ECU.

  • Bus buffer ECU CAN branch wire or connector

  • Bus buffer ECU

 Network gateway ECU

For vehicles with a bus buffer ECU.

WIRING DIAGRAM

A01XNNWE06
*a No. 3 CAN Junction Connector
*b Bus Buffer ECU
*c Dealer-installed Option

CAUTION / NOTICE / HINT

Note


  • Before measuring the resistance of the CAN bus, turn the engine switch off and leave the vehicle for 1 minute or more without operating the key, switches or opening or closing the doors. After that, disconnect the cable from the negative (-) auxiliary battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.

  • After turning the engine switch off, waiting time may be required before disconnecting the cable from the auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the auxiliary battery terminal notice before proceeding with work.

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  • Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output.

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  • After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.

  • DTC check procedure: Turn the engine switch on (IG) and wait at least 20 seconds.

  • After the repair, perform the CAN bus check and check that all the ECUs and sensors connected to the CAN communication system are displayed.

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  • Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE


  1. RECONFIRM DTC OUTPUT


    1. Check for DTCs.


      Body Electrical > Gateway > Trouble Codes

      Tech Tips

      If DTC U1002 is output from the 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 A
      U1002 is output from network gateway ECU B

    B

    GO TO DIAGNOSIS PROCEDURE INDICATED BY OUTPUT DTC Click here

    A

  2. CHECK FOR OPEN IN CAN BUS WIRE (BUS BUFFER ECU BRANCH WIRE)


    1. B005A7RC01
      *a

      Front view of wire harness connector

      (to Bus Buffer ECU)

      Disconnect the cable from the negative (-) auxiliary battery terminal.

    2. Disconnect the bus buffer ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I130-4 (CAN+) - I130-8 (CAN-) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE BUS BUFFER ECU

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (BUS BUFFER ECU)