Toyota 4Runner manuals

Toyota 4Runner: LIN Communication Master Malfunction (B2287,B278C)

Toyota 4Runner Service Manual / Power Source / Network / Networking / Lin Communication System / LIN Communication Master Malfunction (B2287,B278C)

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 Code

DTC Detection Condition

Trouble Area

B2287

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

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


CAUTION / NOTICE / HINT

NOTICE:

  • When using the Techstream with the ignition switch off to troubleshoot:

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

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

HINT:

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


PROCEDURE

1.

CLEAR DTC

(a) Clear the DTCs (See page ).



NEXT

2.

CHECK FOR DTC

(a) Check for DTCs (See page ).


OK:

DTC B2287 or B278C is not output.


OK

USE SIMULATION METHOD TO CHECK


NG

3.

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

(a) Disconnect the F79 certification ECU connector.

(b) Disconnect the F80 power management control ECU connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

F79-29 (LIN) - F80-24 (LIN2)

Always

Below 1 Ω

F79-29 (LIN) or F80-24 (LIN2) - Body ground

Always

10 kΩ or higher


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR


OK

4.

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

(a) Disconnect the F80 power management control ECU connector.


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

Standard Resistance:

Tester Connection

Condition

Specified Condition

F80-5 (GND2) - Body ground

Always

Below 1 Ω

F80-6 (GND) - Body ground

Always

Below 1 Ω

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

F80-1 (AM22) - Body ground

Always

11 to 14 V

F80-2 (AM21) - Body ground

Always

11 to 14 V

Text in Illustration

*a

Rear view of wire harness connector

(to Power Management Control ECU)


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR


OK

5.

REPLACE POWER MANAGEMENT CONTROL ECU

(a) Temporarily replace the power management control ECU with a new or normally functioning one (See page ).



NEXT

6.

CLEAR DTC

(a) Clear the DTCs (See page ).



NEXT

7.

CHECK FOR DTC

(a) Check for DTCs (See page ).


OK:

DTC B2287 or B278C is not output.


OK

END (POWER MANAGEMENT CONTROL ECU IS DEFECTIVE)


NG

REPLACE CERTIFICATION ECU

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