| Last Modified: 11-29-2007 | 1.6 J | |
| Service Category: Steering | Section: Power Assist Systems | |
| Model Year: 2008 | Model: Sequoia | Doc ID: RM000001JTN004X |
| Title: POWER ASSIST SYSTEMS: POWER STEERING SYSTEM: DESCRIPTION (2008 Sequoia) | ||
|
VFC Power Steering Solenoid Circuit |
DESCRIPTION
This circuit supplies electric power to the power steering solenoid valve.
The power steering ECU controls the output current to the power steering solenoid valve in accordance with the steering angle signal, the steering zero point memory, the vehicle speed signal, and the engine speed signal, adjusting the amount of power steering assist.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
|
1. |
CHECK HARNESS AND CONNECTOR (POWER STEERING SOLENOID VALVE - ECU) |
(a) Disconnect the power steering ECU connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
H38-4 (SOF-) - H38-9 (SOF+) |
20°C (68°F) |
6.7 to 7.3 Ω |
|
H38-4 (SOF-) - Body ground |
Always |
10 kΩ or higher |
|
H38-9 (SOF+) - Body ground |
Always |
10 kΩ or higher |
|
|
2. |
INSPECT POWER STEERING SOLENOID VALVE |
(a) Disconnect the power steering solenoid valve connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
1 - 2 |
20°C (68°F) |
6.7 to 7.3 Ω |
(c) Connect the battery positive (+) lead with a 21 W bulb to terminal 2 and the negative (-) lead to terminal 1 of the solenoid valve connector. Then check that the valve moves and makes an operating noise.
OK:
Valve moves and makes an operating noise.
Result
|
Result |
Proceed to |
|---|---|
|
OK |
A |
|
NG (3UR-FE) |
B |
|
NG (2UZ-FE) |
C |
|
|
3. |
INSPECT POWER STEERING SOLENOID VALVE |
(a) Disconnect the power steering solenoid valve connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
1 - 2 |
20°C (68°F) |
6.7 to 7.3 Ω |
(c) Connect the battery positive (+) lead with a 21 W bulb to terminal 2 and the negative (-) lead to terminal 1 of the solenoid valve connector. Then check that the valve moves and makes an operating noise.
OK:
Valve moves and makes an operating noise.
Result
|
Result |
Proceed to |
|---|---|
|
OK |
A |
|
NG (3UR-FE) |
B |
|
NG (2UZ-FE) |
C |
|
|
|