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. |
|
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 .gif)
).
|
.gif)
|
2. |
CHECK FOR DTC |
(a) Check for DTCs (See page ).
OK:
DTC B2786 is not output.
| OK | .gif) |
USE SIMULATION METHOD TO CHECK |
|
|
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 |
|
|
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 |
|
*a |
Front view of wire harness connector (to Steering Lock Actuator Assembly [Steering Lock ECU]) |
| NG | |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
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 ).
|
|
6. |
CLEAR DTC |
(a) Clear the DTCs (See page ).
|
|
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 |
Data List / Active Test
DATA LIST / ACTIVE TEST
1. READ DATA LIST
HINT:
Using the Techstream to read the Data List allows the values or states of switches,
sensors, actuators and other items to be read without removing ...
Diagnostic Trouble Code Chart
DIAGNOSTIC TROUBLE CODE CHART
Main Body ECU (Multiplex Network Body ECU)
DTC Code
Detection Item
See page
B1206
P/W Master Switch Communi ...
Other materials about Toyota 4Runner:
Removal
REMOVAL
PROCEDURE
1. REMOVE JACK BOX HOLE COVER
2. REMOVE REAR QUARTER PANEL MUDGUARD LH
3. REMOVE REAR QUARTER PANEL MUDGUARD RH
HINT:
Use the same procedure as for the LH side.
4. REMOVE REAR BUMPER COVER
(a) Remove the 2 bolts and 2 screws.
...
Installation
INSTALLATION
PROCEDURE
1. INSTALL FRONT DRIVE SHAFT ASSEMBLY
(a) Coat the spline of the inboard joint shaft assembly with ATF.
(b) Align the shaft splines and install the drive shaft with a brass bar and
hammer.
NOTICE:
Set the snap ring with ...
0.0141