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 Communication between the certification ECU (smart key ECU assembly) and transmission control ECU assembly stops for 10 seconds or more.

  • Transmission control ECU assembly

  • Certification ECU (smart key ECU assembly)

  • Harness or connector

WIRING DIAGRAM

A01MJAXE01

CAUTION / NOTICE / HINT

Note


  • When using the GTS with the power switch off to troubleshoot:

    Connect the GTS to the vehicle, and turn a courtesy light switch on and off at 1.5 second intervals until communication between the GTS and vehicle begins.

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

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

Tech Tips

When the communication between the transmission control ECU assembly and certification ECU (smart key ECU assembly) stops, DTC B2785 is also stored.

PROCEDURE


  1. CLEAR DTC


    1. Clear the DTCs.

      Click here


      Body Electrical > Entry&Start > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  2. CHECK FOR DTC


    1. Check for DTCs.

      Click here


      Body Electrical > Entry&Start > Trouble Codes
      Result
      Result Proceed to
      DTC B2786 is not output A
      DTC B2786 is output B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

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


    1. Disconnect the G41 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the A26 transmission control ECU assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G41-6 (LIN) - A26-24 (LIN) Always Below 1 Ω
      G41-6 (LIN) or A26-24(LIN) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL ECU ASSEMBLY - POWER SOURCE CIRCUIT)

    A01MJE1C02
    *a

    Front view of wire harness connector

    (to Transmission Control ECU Assembly)

    1. Disconnect the transmission control ECU assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A26-1 (E1) - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A25-15 (BATT) - Body ground Power switch off 11 to 14 V
      A25-16 (+B) - Body ground Power switch on (IG) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. REPLACE TRANSMISSION CONTROL ECU ASSEMBLY


    1. Temporarily replace the transmission control ECU assembly with a new one.

      Click here

    2. Clear the DTCs.

      Click here


      Body Electrical > Entry&Start > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  6. CHECK FOR DTC


    1. Check for DTCs.

      Click here


      Body Electrical > Entry&Start > Trouble Codes
      Result
      Result Proceed to
      DTC B2786 is not output A
      DTC B2786 is output B

    A

    END (TRANSMISSION CONTROL ECU ASSEMBLY WAS DEFECTIVE)

    B

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)