Toyota 4Runner: Open / Short in Steering Lock ECU (B2781)
DESCRIPTION
The steering lock ECU and steering lock actuator assembly are supplied as a unit.
The steering lock ECU detects the steering lock position through the signals from the lock and unlock position sensors.
The steering lock ECU activates the steering lock motor based on permission signals from the power management control ECU and the certification ECU.
The diagnosis information of the steering lock ECU is transmitted to the Techstream via the certification ECU as the steering lock ECU is not connected to the CAN communication system.
|
DTC Code |
Detection Condition |
Trouble Area |
|---|---|---|
|
B2781 |
Either condition is met:
|
|
CAUTION / NOTICE / HINT
HINT:
When the engine switch is off, the main body ECU may occasionally go into a non-active state called sleep mode. Therefore, before proceeding with the inspection, it is necessary to perform the following steps to wake up the ECU:
With the engine switch off, open the driver door. Then (with the engine switch still off) open and close any door several times at 1.5 second intervals.
NOTICE:
- If the steering lock actuator assembly (steering lock ECU) is replaced, with the engine switch off and the shift lever in P, open and close the driver side door to record the current lock position into the steering lock ECU. If this is not performed, the engine may not start.
- When replacing the steering lock ECU, registration must be performed
(See page
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).
PROCEDURE
|
1. |
CHECK DTC OUTPUT (B2785) |
(a) Check for DTCs (See page ).
Result
|
Result |
Proceed to |
|---|---|
|
DTC B2781 and DTC B2785 are output |
A |
|
DTC B2781 is output, but DTC B2785 is not output |
B |
| A | .gif) |
GO TO LIN COMMUNICATION SYSTEM (DTC B2785) |
| B | |
REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU) |
Power Source Control ECU Malfunction (B2782)
DESCRIPTION
The steering lock ECU activates the steering lock motor with the power from the
power management control ECU through the IGE circuit. This prevents the steering
from being locked whil ...
Unable to Lock Steering Wheel
DESCRIPTION
The steering lock ECU sends an unlock position signal to the power management
control ECU. Upon receiving the signal, the power management control ECU permits
an engine start. This pr ...
Other materials about Toyota 4Runner:
General Maintenance
GENERAL MAINTENANCE
PROCEDURE
1. INSPECT STEERING LINKAGE AND GEAR HOUSING
(a) Check the steering wheel free play.
(b) Check the steering linkage for looseness or damage.
(1) Check that the tie rod ends do not have excessive play.
(2) Check that the dust ...
Disassembly
DISASSEMBLY
CAUTION / NOTICE / HINT
PROCEDURE
1. REMOVE OUTER MIRROR LH
(a) Put protective tape around the outer mirror LH.
(b) Using a moulding remover, detach the 2 claws of the outer mirror
LH as shown in the illustration.
Text in Ill ...
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