2007 TOYOTA SIENNA steering wheel

POWER STEERING – POWER STEERING SYSTEMPS–5
PS
(g) With the engine idling, open the valve fully.
(h) Measure the fluid pressure at engine speeds of
1,000 rpm and 3,000 rpm.
Fluid pressure difference:
490 kPa (5 kgf/cm
2, 71 psi) or less
NOTICE:
Do not turn the steering wheel.
(i) With the engine idling and the valve fully opened,
turn the steering wheel left or right to the full lock
position. Observe the reading on SST.
Standard fluid pressure:
7,800 to 8,300 kPa (79.5 to 84.6 kgf/cm
2, 1,131
to 1,204 psi)
NOTICE:
• Do not keep the steering wheel in the full lock
position for more than 10 seconds.
• Do not allow the fluid temperature to become
too high.
(j) Disconnect SST.
(k) Connect the pressure feed tube assembly to the
vane pump assembly (See page PS-19).
(l) Bleed the power steering system (See page PS-6).
4. CHECK STEERING EFFORT
(a) Stop the vehicle on a level, paved surface and turn
the wheels straight ahead.
(b) Disconnect the negative (-) battery cable from the
battery.
CAUTION:
Wait at least 90 seconds after disconnecting the
cable from the negative (-) battery terminal to
prevent airbag and seat belt pretensioner
activation.
(c) Remove the steering pad (See page RS-423).
(d) Connect the negative (-) battery cable to the battery.
(e) Using a torque wrench, check if the steering wheel
set nut is properly tightened.
Torque: 50 N*m (510 kgf*cm, 37 ft.*lbf)
(f) Start the engine and run it at idle.
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PS–6POWER STEERING – POWER STEERING SYSTEM
PS
(g) Turn the steering wheel 90 degrees to the right and
check steering effort (torque) while turning the
wheel. Check the opposite direction in the same
manner.
Torque: Steering effort (Reference)
6.0 N*m (61 kgf*cm, 53 in.*lbf)
HINT:
Check the tire type, pressure, and the road surface
before making your diagnosis.
(h) Disconnect the negative (-) battery cable from the
battery.
(i) Tighten the steering wheel set nut.
Torque: 50 N*m (510 kgf*cm, 37 ft.*lbf)
(j) Install the steering pad (See page RS-424).
(k) Connect the negative (-) battery cable to the battery.
(l) Clear the DTCs (See page RS-35).
(m) Inspect the airbag warning light (See page RS-27).
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PS–6POWER STEERING – POWER STEERING FLUID
PS
POWER STEERING FLUID
BLEEDING
1. BLEED POWER STEERING SYSTEM
(a) Check the fluid level (See page PS-2).
(b) Jack up the front of the vehicle and support it with
stands.
(c) Turn the steering wheel.
(1) With the engine stopped, turn the steering
wheel slowly from lock to lock several times.
(d) Lower the vehicle.
(e) Start the engine.
(1) Run the engine at idle for a few minutes.
(f) Turn the steering wheel.
(1) With the engine idling, turn the steering wheel
left or right to the full lock position and keep it in
that position for 2 to 3 seconds, then turn the
steering wheel to the opposite full lock position
and keep it there for 2 to 3 seconds.
(2) Repeat this procedure several times.
(g) Stop the engine.
(h) Check for foaming or emulsification.
HINT:
If the system has to be bled twice because of
forming or emulsification, be sure to check for fluid
leaks in the system.
(i) Check the fluid level (See page PS-2).
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POWER STEERING – VANE PUMPPS–9
PS
REMOVAL
1. DRAIN POWER STEERING FLUID
2. REMOVE FRONT WHEEL RH
3. REMOVE FRONT FENDER APRON SEAL RH (See
page EM-26)
4. REMOVE FAN AND GENERATOR V BELT (See page
EM-6)
5. DISCONNECT NO. 1 FLUID RESERVOIR TO PUMP
HOSE
(a) Slide the clip and disconnect the No. 1 fluid
reservoir to pump hose from the vane pump
assembly.
6. DISCONNECT PRESSURE FEED TUBE ASSEMBLY
(a) Remove the union bolt and disconnect the pressure
feed tube assembly from the vane pump assembly.
(b) Remove the gasket from the pressure feed tube
assembly.
7. DISCONNECT POWER STEERING FLUID PRESSURE
SWITCH CONNECTOR
(a) Disconnect the power steering fluid pressure switch
connector.
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PS–20POWER STEERING – VANE PUMP
PS
(b) Temporarily connect the pressure feed tube
assembly to the vane pump assembly with the union
bolt.
(c) Fully tighten the union bolt.
Torque: 50 N*m (510 kgf*cm, 37 ft.*lbf)
NOTICE:
Make sure that the stopper of the pressure feed
tube assembly contacts the vane pump
assembly securely as shown in the illustration.
4. CONNECT NO. 1 FLUID RESERVOIR TO PUMP HOSE
(a) Connect the No. 1 fluid reservoir to pump hose to
the vane pump assembly with the clip.
NOTICE:
• Connect the No. 1 fluid reservoir to pump
hose with the paint mark facing toward the
rear of the vehicle.
• Push the No. 1 fluid reservoir to pump hose
as far as it goes as shown in the illustration.
• Install the clip at the position specified in the
illustration.
5. INSTALL FAN AND GENERATOR V BELT (See page
EM-7)
6. ADD POWER STEERING FLUID
7. BLEED POWER STEERING SYSTEM (See page PS-6)
8. CHECK POWER STEERING FLUID LEVEL (See page
PS-2)
9. INSPECT FOR POWER STEERING FLUID LEAK
10. INSTALL FRONT FENDER APRON SEAL RH (See
page EM-62)
11. INSTALL FRONT WHEEL RH
Torque: 103 N*m (1,050 kgf*cm, 76 ft.*lbf)
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PS–24POWER STEERING – RACK AND PINION POWER STEERING GEAR
PS
REMOVAL
NOTICE:
When installing, coat the parts indicated by the arrows
with power steering fluid or molybdenum disulfide
lithium base grease (See page PS-21).
1. INSPECT CENTER FRONT WHEEL
2. REMOVE FRONT WHEEL
3. SEPARATE TIE ROD ASSEMBLY LH
SST 09628-62011
4. SEPARATE TIE ROD ASSEMBLY RH
SST 09628-62011
HINT:
Perform the same procedure on the other side.
5. SEPARATE STEERING INTERMEDIATE SHAFT
ASSEMBLY
(a) Fix the steering wheel with the seat belt.
(b) Release the 3 springs and separate the dust cover.
(c) Place matchmarks on the intermediate shaft
assembly and power steering gear assembly.
(d) Remove the bolt and separate the intermediate
shaft assembly.
6. SEPARATE FRONT STABILIZER LINK ASSEMBLY LH
7. SEPARATE FRONT STABILIZER LINK ASSEMBLY
RH
HINT:
Perform the same procedure on the other side.
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PS–38POWER STEERING – RACK AND PINION POWER STEERING GEAR
PS
11. INSTALL STEERING RACK END SUB-ASSEMBLY
(a) Install 2 new claw washers, and temporarily install
the 2 steering rack end sub-assembly.
HINT:
Align the claws of the claw washer with the power
steering rack grooves.
(b) Using 2 SST, install the 2 rack end sub-assembly.
SST 09922-10010
Torque: 58.5 N*m (597 kgf*cm, 43 ft.*lbf)
NOTICE:
Use SST 09922-10010 in the direction shown in
the illustration.
HINT:
• Using SST, hold the power steering rack and
install the rack end sub-assembly.
• Use a torque wrench with a fulcrum length of 345
mm (13.58 in.).
(c) Using a brass bar and a hammer, stake the 2 claw
washers.
NOTICE:
Avoid any impact to the power steering rack.
12. INSPECT STEERING RACK END SUB-ASSEMBLY
(a) Ensure that the rack end sub-assembly hole is not
clogged with grease.
HINT:
If the hole is clogged, the pressure inside the boot
will change after it is assembled and steering wheel
is turned.
13. INSTALL STEERING RACK BOOT NO.2
14. INSTALL STEERING RACK BOOT NO.1
15. INSTALL STEERING RACK BOOT NO.2 CLAMP
(a) Using SST, tighten the rack boot No.2 clamp, as
shown in the illustration.
SST 09521-24010
Clearance:
3.0 mm (0.118 in.) or less
NOTICE:
Be careful not to damage the rack boot No. 2.
16. INSTALL STEERING RACK BOOT NO.1 CLAMP
SST 09521-24010
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POWER STEERING – RACK AND PINION POWER STEERING GEARPS–41
PS
3. INSTALL FRONT STABILIZER BRACKET NO.1 LH
(a) Install the stabilizer bracket No. 1 with the 2 bolts.
Torque: 17 N*m (173 kgf*cm, 12 ft.*lbf)
4. INSTALL FRONT STABILIZER BRACKET NO.1 RH
HINT:
Perform the same procedure on the other side.
5. INSTALL FRONT STABILIZER LINK ASSEMBLY LH
6. INSTALL FRONT STABILIZER LINK ASSEMBLY RH
HINT:
Perform the same procedure on the other side.
7. INSTALL STEERING INTERMEDIATE SHAFT
ASSEMBLY
(a) Align matchmarks on the intermediate shaft
assembly and power steering gear assembly.
(b) Install the bolt.
Torque: 36 N*m (367 kgf*cm, 27 ft.*lbf)
(c) Install the dust cover.
HINT:
Ensure that the springs are installed tightly.
8. INSTALL TIE ROD ASSEMBLY LH
9. INSTALL TIE ROD ASSEMBLY RH
HINT:
Perform the same procedure on the other side.
10. INSTALL FRONT WHEEL
Torque: 103 N*m (1,050 kgf*cm, 76 ft.*lbf)
11. INSPECT CENTER FRONT WHEEL
12. INSPECT STEERING WHEEL CENTER POINT
13. ADD POWER STEERING FLUID
14. BLEED POWER STEERING FLUID
HINT:
(See page PS-6)
15. INSPECT FOR POWER STEERING FLUID LEAK
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