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. DTC Detection Condition Trouble Area
B2786 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

A003W8XE02

INSPECTION PROCEDURE

Tech Tips

Although "No Response from Steering Lock ECU" is displayed on the intelligent tester, this message is shown if the certification ECU (smart key ECU assembly) cannot communicate with the transmission control ECU assembly.

Note


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

  • If the certification ECU (smart key ECU assembly) is replaced, register the key.

  • If the transmission control ECU assembly is replaced, register the ECU code.

  • When using the intelligent tester to troubleshoot with the power switch off:

    Connect the intelligent tester to the DLC3, and turn the courtesy switch on and off at 1.5-second intervals until communication between the intelligent tester and vehicle begins.

PROCEDURE


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


    1. Disconnect the A21 and A22 transmission control ECU assembly connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A22-6 (E01) - Body ground Always Below 1 Ω
      A22-5 (E02) - Body ground Always Below 1 Ω
      A22-1 (E1) - Body ground Always Below 1 Ω
      Standard Voltage
      Tester Connection Condition Specified Condition
      A21-15 (BATT) - Body ground Power switch off 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - TRANSMISSION CONTROL ECU ASSEMBLY)


    1. Disconnect the H1*1 or H143*2 certification ECU (smart key ECU assembly) connector.


      • *1: w/ Entry Function

      • *2: w/o Entry Function

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

      Standard Resistance
      w/ Entry Function
      Tester Connection Condition Specified Condition
      H1-29 (LIN) - A22-24 (LIN) Always Below 1 Ω
      H1-29 (LIN) - Body ground Always 10 kΩ or higher
      w/o Entry Function
      Tester Connection Condition Specified Condition
      H143-29 (LIN) - A22-24 (LIN) Always Below 1 Ω
      H143-29 (LIN) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. REPLACE TRANSMISSION CONTROL ECU ASSEMBLY


    1. Replace the transmission control ECU assembly Click here.


    NEXT

  4. CHECK DTC OUTPUT


    1. Clear the DTC Click here.

    2. Recheck for DTCs.

      OK
      DTC B2786 is not output.

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    OK

    END (TRANSMISSION CONTROL ECU ASSEMBLY WAS DEFECTIVE)