Toyota 4Runner: 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 prevents the engine from being started with the steering locked.
The steering lock actuator activates the steering lock motor and moves the lock bar into the steering column to lock the steering wheel.
When the steering lock is operating, the steering lock may not lock when the lock bar is not aligned with the lock hole of the steering column. In this case, the steering lock can be locked by turning the steering wheel a little in the same manner as is done for a vehicle with a mechanical key to change the position of the lock hole.
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.
WIRING DIAGRAM
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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, ID code box or certification ECU,
registration must be performed (See page
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).
PROCEDURE
|
1. |
READ VALUE USING TECHSTREAM (LOCK REQUEST RECEIVE) |
(a) Use the Data List to check if the steering lock command is functioning properly.
Smart Key|
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
Lock Request Receive |
Steering lock lock command reception status/NG or OK |
NG: Lock request not received OK: Lock request received |
- |
OK:
The certification ECU receives a lock request signal within 10 seconds of turning the engine switch from on (IG) to off and opening a door, and OK is displayed on the Techstream screen.
| NG | .gif) |
GO TO STEP 4 |
|
.gif)
|
2. |
INSPECT STEERING LOCK ECU (IGE VOLTAGE) |
|
(a) Move the shift lever to P. |
|
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(b) Measure the voltage and resistance according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
F68-3 (IGE) - F68-1 (GND) |
Steering lock motor operating immediately after turning engine switch from off to on (IG) |
Below 1 V |
|
F68-3 (IGE) - F68-1 (GND) |
Steering lock motor not operating |
11 to 14 V |
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
F68 -1 (GND) - Body ground |
Always |
Below 1 Ω |
|
*a |
Component with harness connected (Steering Lock ECU) |
| NG | |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
3. |
CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - POWER MANAGEMENT CONTROL ECU) |
(a) Disconnect the F80 power management control ECU connector.
(b) Disconnect the F68 steering lock ECU connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
F68-3 (IGE) - F80-8 (SLR+) |
Always |
Below 1 Ω |
|
F68-3 (IGE) or F80-8 (SLR+) - Body ground |
Always |
10 kΩ or higher |
| OK | |
REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU) |
| NG | |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
4. |
READ VALUE USING TECHSTREAM (FL DOOR COURTESY) |
(a) Use the Data List to check if the driver side door courtesy switch is functioning properly.
Main Body|
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
FL Door Courtesy |
Front door courtesy switch LH/ON or OFF |
ON: Front door courtesy switch LH on OFF: Front door courtesy switch LH off |
- |
OK:
Driver side door courtesy switch is functioning properly.
| NG | |
GO TO LIGHTING SYSTEM (DOOR COURTESY SWITCH CIRCUIT) |
|
|
5. |
READ VALUE USING TECHSTREAM (S CODE CHECK) |
(a) Use the Data List to check if the S code certification is functioning properly.
Smart Key|
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
S Code Check |
S code certification result/NG or OK |
OK: S code certification result normal NG: S code certification result abnormal |
- |
OK:
OK is displayed on the Techstream.
| NG | |
GO TO STEP 9 |
|
|
6. |
READ VALUE USING TECHSTREAM (L CODE CHECK) |
(a) Use the Data List to check if the L code certification is functioning properly.
Smart Key|
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
L Code Check |
L code certification result/NG or OK |
OK: L code certification result normal NG: L code certification result abnormal |
- |
OK:
OK is displayed on the Techstream.
| NG | |
GO TO STEP 11 |
|
|
7. |
REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU) |
(a) Replace the steering lock actuator assembly (steering lock ECU) (See page
).
|
|
8. |
CHECK STEERING LOCK RELEASE OPERATION |
(a) Turn the engine switch on (IG).
(b) Operate the steering wheel and check the steering lock condition.
OK:
Steering lock is released.
| OK | |
END (STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU) IS DEFECTIVE) |
| NG | |
REPLACE CERTIFICATION ECU |
|
9. |
REPLACE ID CODE BOX |
(a) Replace the ID code box (See page ).
|
|
10. |
READ VALUE USING TECHSTREAM (S CODE CHECK) |
(a) Use the Data List to check if the S code certification is functioning properly.
Smart Key|
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
S Code Check |
S code certification result/NG or OK |
OK: S code certification result normal NG: S code certification result abnormal |
- |
OK:
OK is displayed on the Techstream.
| OK | |
END (ID CODE BOX IS DEFECTIVE) |
| NG | |
REPLACE CERTIFICATION ECU |
|
11. |
REPLACE ID CODE BOX |
(a) Replace the ID code box (See page ).
|
|
12. |
READ VALUE USING TECHSTREAM (L CODE CHECK) |
(a) Use the Data List to check if the L code certification is functioning properly.
Smart Key|
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
L Code Check |
L code certification result/NG or OK |
OK: L code certification result normal NG: L code certification result abnormal |
- |
OK:
OK is displayed on the Techstream.
| OK | |
END (ID CODE BOX IS DEFECTIVE) |
| NG | |
REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU) |
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 ...
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