DTC    B2287    LIN Communication Master Malfunction

DTC    B278C    Lost Communication with Power Source Control

for Preparation Click here


DESCRIPTION

  1. If communication with the certification ECU is interrupted for more than a specified interval, the power management control ECU or the power source control ECU stores B2287.
  2. The certification ECU stores a B278C when communication with the power management control ECU*1 or the power source control ECU*2 is interrupted for 10 seconds or more.

DTC No.
DTC Detection Condition
Trouble Area
B2287
Communication malfunction between the certification ECU and the power management control ECU*1 or the power source control ECU*2
  1. Harness or connector
  2. Certification ECU
  3. Power management control ECU*1
  4. Power source control ECU*2
B278C
Communication between certification ECU and the power management control ECU*1 or the power source control ECU*2 interrupted for 10 seconds or more
*1: for 1KR-FE and 1NR-FE with Entry and Start System
*2: for 1ND-TV with Entry and Start System

WIRING DIAGRAM


E176075E02


INSPECTION PROCEDURE

HINT:
When using the intelligent tester, repeatedly turn either front door courtesy light switch off-and-on at intervals of 1.5 seconds or less, until communication between the intelligent tester and vehicle begins.

NOTICE:
  1. Inspect the fuses for this circuit before starting this inspection procedure.
  2. Refer to the Service Bulletin for the installation position of the certification ECU.

1.CLEAR DTC

  1. Clear DTCs (Click here).


NEXT


2.READ OUTPUT DTC

  1. Check for DTCs (Click here).
    Result 
    Result
    		Proceed to
    DTC B2287 and/or B278C are output
    		A
    B2287 and/or B278C and B2785 are output
    		B

HINT:
When both B2287 and/or B278C and B2785 are output at the same time, troubleshoot B2785 first.



B
DIAGNOSTIC TROUBLE CODE CHART (Click here)
A


3.SYSTEM CHECK

  1. Check the vehicle specifications.
    Result 
    Result
    		Proceed to
    for 1KR-FE and 1NR-FE with Entry and Start System
    		A
    for 1ND-TV with Entry and Start System
    		B



B
Go to step 8
A


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


    E175956E02

  1. Disconnect the D34 certification ECU connector.

  1. Disconnect the D38 power management control ECU connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    D34-29 (LIN) - D38-24 (LIN2)
    		Always
    		Below 1 Ω
    D38-24 (LIN2) - Body ground
    		Always
    		10 KΩ or higher

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    D38-24 (LIN2) - Body ground
    		Always
    		Below 0.5 V

    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Certification ECU)
    *2
    		Front view of wire harness connector
    (to Power Management Control ECU)

  1. Reconnect the certification ECU connector.

  1. Reconnect the power management control ECU connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


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


    E175957E01

  1. Disconnect the D38 power management control ECU connector.

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    D38-1 (AM22) - Body ground
    		Always
    		11 to 14 V
    D38-2 (AM21) - Body ground
    		Always
    		11 to 14 V

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    D38-6 (GND) - Body ground
    		Always
    		Below 1 Ω
    D38-5 (GND2) - Body ground
    		Always
    		Below 1 Ω

    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Power Management Control ECU)

  1. Reconnect the power management control ECU connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


6.REPLACE POWER MANAGEMENT CONTROL ECU NORMAL ONE

  1. Replace the power management control ECU with a normally functioning part (Click here).

  1. Clear DTCs (Click here).


NEXT


7.RECONFIRM DTC OUTPUT

  1. Recheck for DTCs (Click here).
    Result 
    Result
    		Proceed to
    DTC B2287 and/or B278C are not output
    		A
    DTC B2287 and/or B278C are output
    		B



B
REPLACE CERTIFICATION ECU
A

END (POWER MANAGEMENT CONTROL ECU MALFUNCTION) 

8.CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - POWER SOURCE CONTROL ECU)


    E175956E01

  1. Disconnect the D34 certification ECU connector.

  1. Disconnect the D73 power source control ECU connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    D34-29 (LIN) - D73-24 (LIN2)
    		Always
    		Below 1 Ω
    D73-24 (LIN2) - Body ground
    		Always
    		10 KΩ or higher

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    D73-24 (LIN2) - Body ground
    		Always
    		Below 0.5 V

    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Certification ECU)
    *2
    		Front view of wire harness connector
    (to Power Source Control ECU)

  1. Reconnect the certification ECU connector.

  1. Reconnect the power source control ECU connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


9.CHECK HARNESS AND CONNECTOR (POWER SOURCE CONTROL ECU - BATTERY AND BODY GROUND)


    E175957E02

  1. Disconnect the D73 power source control ECU connector.

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    D73-1 (AM22) - Body ground
    		Always
    		11 to 14 V
    D73-2 (AM21) - Body ground
    		Always
    		11 to 14 V

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    D73-6 (GND) - Body ground
    		Always
    		Below 1 Ω
    D73-5 (GND2) - Body ground
    		Always
    		Below 1 Ω

    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Power source Control ECU)

  1. Reconnect the power source control ECU connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


10.REPLACE POWER SOURCE CONTROL ECU NORMAL ONE

  1. Replace the power source control ECU with a normally functioning part (Click here).

  1. Clear DTCs (Click here).


NEXT


11.RECONFIRM DTC OUTPUT

  1. Recheck for DTCs (Click here).
    Result 
    Result
    		Proceed to
    DTC B2287 and/or B278C are not output
    		A
    DTC B2287 and/or B278C are output
    		B



B
REPLACE CERTIFICATION ECU
A

END (POWER SOURCE CONTROL ECU MALFUNCTION)