LIN COMMUNICATION SYSTEM, Diagnostic DTC:B2287 and B278C

DTC Code DTC Name
B2287 LIN Communication Master Malfunction
B278C Lost Communication with Power Source Control

DESCRIPTION

  • DTC B2287 is stored when there is an open or short circuit or an ECU communication malfunction between the power management control ECU and certification ECU.

  • DTC B278C is stored when LIN communication between the certification ECU and power management control ECU stops for 10 seconds or more.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B2287

LIN Communication Master Malfunction

There is an open or short circuit or an ECU communication malfunction between the power management control ECU and certification ECU.

  • Certification ECU

  • Power management control ECU

  • Harness or connector

B278C

Lost Communication with Power Source Control

No communication between the certification ECU and power management control ECU for 10 seconds or more.

  • Certification ECU

  • Power management control ECU

  • Harness or connector

WIRING DIAGRAM

C263744E01

CAUTION / NOTICE / HINT

Note:

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

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

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

  • Before replacing the certification ECU, refer to the Service Bulletin.

Tip:

When DTC B2287, B278C and B2785 are output simultaneously, perform troubleshooting for DTC B2785 first (Click here).

PROCEDURE

  1. CLEAR DTC

    1. Clear the DTCs

      Click here

      Body Electrical > Main Body > Clear DTCs

    Result

    Result

    NEXT
    NEXT

  2. CHECK FOR DTC

    1. Check for DTCs

      Click here

      Body Electrical > Main Body > Trouble Codes

      OK

      DTC B2287 or B278C is not output.

    Result

    Result

    OK

    NG
    OK

    USE SIMULATION METHOD TO CHECK

    Click here

    NG

  3. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - POWER MANAGEMENT CONTROL ECU)

    1. Disconnect the G26 certification ECU connector.

    2. Disconnect the G39 power management control ECU connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      G26-29 (LIN) - G39-24 (LIN2)

      Always

      Below 1 Ω

      G26-29 (LIN) or G39-24 (LIN2) - Body ground

      Always

      10 kΩ or higher

    Result

    Result

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - BATTERY AND BODY GROUND)

    C263745C01

    *a

    Rear view of wire harness connector

    (to Power Management Control ECU)

    1. Disconnect the G39 power management control ECU connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      G39-5 (GND2) - Body ground

      Always

      Below 1 Ω

      G39-6 (GND) - Body ground

      Always

      Below 1 Ω

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      G39-1 (AM22) - Body ground

      Always

      11 to 14 V

      G39-2 (AM21) - Body ground

      Always

      11 to 14 V

    Result

    Result

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. REPLACE POWER MANAGEMENT CONTROL ECU

    1. Temporarily replace the power management control ECU with a new or normally functioning on

      Click hereClick here

    Result

    Result

    NEXT
    NEXT

  6. CLEAR DTC

    1. Clear the DTCs

      Click here

      Body Electrical > Main Body > Clear DTCs

    Result

    Result

    NEXT
    NEXT

  7. CHECK FOR DTC

    1. Check for DTCs

      Click here

      Body Electrical > Main Body > Trouble Codes

      OK

      DTC B2287 or B278C is not output.

    Result

    Result

    OK

    NG
    OK

    END (POWER MANAGEMENT CONTROL ECU IS DEFECTIVE)

    NG

    REPLACE CERTIFICATION ECU