LIN COMMUNICATION SYSTEM, Diagnostic DTC:B2786

DTC Code DTC Name
B2786 No Response from Steering Lock ECU

DESCRIPTION

This DTC is stored when LIN communication between the certification ECU (smart key ECU assembly) and transmission control ECU assembly stops for 10 seconds or more.

DTC No. Detection Item DTC Detection Condition Trouble Area
B2786 No Response from Steering Lock ECU No communication between transmission control ECU assembly and certification ECU (smart key ECU assembly) for 10 seconds or more.

  • Transmission control ECU assembly

  • Certification ECU (smart key ECU assembly)

  • Wire harness or connector

  • P CON MAIN fuse

WIRING DIAGRAM

A01KT3JE05
*a P CON MAIN
*b Certification ECU (Smart Key ECU Assembly)
*c Transmission Control ECU Assembly
*d LIN Communication Line

CAUTION / NOTICE / HINT

Note


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

  • If the certification ECU (smart key ECU assembly) or transmission control ECU assembly is replaced, refer to Service Bulletin.

PROCEDURE


  1. CHECK DTC OUTPUT


    1. Clear the DTCs.

      Click here


      Body Electrical > Entry&Start > Clear DTCs

    2. Recheck for DTCs.


      Body Electrical > Entry&Start > Trouble Codes

      Tech Tips

      When DTC B2786 and B2785 are output simultaneously, perform troubleshooting for DTC B2785 first.

      Result
      Result Proceed to
      Only B2786 is output A
      DTC B2786 and B2785 are output simultaneously B

    B

    GO TO DTC B2785 Click here

    A

  2. CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL ECU ASSEMBLY - AUXILIARY BATTERY AND BODY GROUND)


    1. Disconnect the A131 and A132 transmission control ECU assembly connectors.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A131-15 (BATT) - A132-1 (E1) Power switch off 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A132-1 (E1) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - TRANSMISSION CONTROL ECU ASSEMBLY)


    1. Disconnect the E116 certification ECU (smart key ECU assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E116-17 (LIN) - A132-24 (LIN) Always Below 1 Ω
      E116-17 (LIN) - Body ground Always 10 kΩ or higher
      A132-24 (LIN) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. REPLACE TRANSMISSION CONTROL ECU ASSEMBLY


    1. Replace the transmission control ECU assembly.

      for LHD: Click here

      for RHD: Click here

      Result
      Proceed to
      NEXT

    NEXT

  5. CHECK DTC OUTPUT


    1. Clear the DTCs.

      Click here


      Body Electrical > Entry&Start > Clear DTCs

    2. Recheck for DTCs.


      Body Electrical > Entry&Start > Trouble Codes
      OK
      DTC B2786 is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (TRANSMISSION CONTROL ECU ASSEMBLY WAS DEFECTIVE)

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)