Toyota 4Runner manuals

Toyota 4Runner: No Response from Steering Lock ECU (B2786)

DESCRIPTION

This DTC is stored when LIN communication between the certification ECU and steering lock actuator assembly (steering lock ECU) stops for 10 seconds or more.

DTC Code

DTC Detection Condition

Trouble Area

B2786

LIN communication between the certification ECU and steering lock ECU stops for 10 seconds or more.

  • Steering lock actuator assembly (steering lock ECU)
  • Certification 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 communication between the steering lock ECU and certification ECU stops, DTC B2785 is also stored.

PROCEDURE

1.

CLEAR DTC

(a) Clear the DTCs (See page ).



NEXT

2.

CHECK FOR DTC

(a) Check for DTCs (See page ).


OK:

DTC B2786 is not output.


OK

USE SIMULATION METHOD TO CHECK


NG

3.

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - STEERING LOCK ECU)

(a) Disconnect the F79 certification ECU connector.

(b) Disconnect the F68 steering lock actuator assembly (steering lock 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) - F68-5 (LIN)

Always

Below 1 Ω

F79-29 (LIN) or F68-5 (LIN) - Body ground

Always

10 kΩ or higher


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR


OK

4.

CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - BATTERY AND BODY GROUND)

(a) Disconnect the F68 steering lock actuator assembly (steering lock ECU) connector.


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

Standard Resistance:

Tester Connection

Condition

Specified Condition

F68-1 (GND) - Body ground

Always

Below 1 Ω

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

F68-6 (IG2) - Body ground

Ignition switch ON

11 to 14 V

F68-7 (B) - Body ground

Always

11 to 14 V

Text in Illustration

*a

Front view of wire harness connector

(to Steering Lock Actuator Assembly [Steering Lock ECU])


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR


OK

5.

REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU)

(a) Temporarily replace the steering lock actuator (steering lock ECU) assembly with a new 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 B2786 is not output.


OK

END (STEERING LOCK ECU IS DEFECTIVE)


NG

REPLACE CERTIFICATION ECU

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