2007 TOYOTA SIENNA Steering

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–7
PS
STEERING
POWER STEERING
VANE PUMP
COMPONENTS
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PS–8POWER STEERING – VANE PUMP
PS
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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–10POWER STEERING – VANE PUMP
PS
8. REMOVE VANE PUMP ASSEMBLY
(a) Using SST, loosen bolt (A) and remove bolt (B), and
then remove the vane pump assembly.
SST 09249-63010
(b) Remove the bolt from the vane pump assembly.
DISASSEMBLY
1. HOLD VANE PUMP ASSEMBLY
(a) Using SST, hold the vane pump assembly in a vise.
SST 09630-00014 (09631-00132)
2. REMOVE POWER STEERING SUCTION PORT UNION
(a) Remove the bolt and the power steering suction port
union from the vane pump front housing.
(b) Using a screwdriver, remove the O-ring from the
power steering suction port union.
3. REMOVE POWER STEERING FLUID PRESSURE
SWITCH
NOTICE:
Perform this procedure only when the power
steering fluid pressure switch is replaced.
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POWER STEERING – VANE PUMPPS–11
PS
(a) Remove the power steering fluid pressure switch
from the vane pump front housing.
4. REMOVE FLOW CONTROL VALVE ASSEMBLY
(a) Remove the pressure port union from the vane
pump front housing.
(b) Remove the O-ring from the pressure port union.
(c) Remove the flow control valve assembly and the
flow control valve compression spring from the vane
pump front housing.
5. REMOVE VANE PUMP REAR HOUSING
(a) Remove the 4 bolts and vane pump rear housing
from the vane pump front housing.
(b) Using a screwdriver, remove the O-ring from the
vane pump rear housing.
HINT:
Tape the screwdriver tip before use.
6. REMOVE VANE PUMP SHAFT WITH PULLEY
(a) Using 2 screwdrivers, remove the vane pump shaft
snap ring from the vane pump shaft with pulley.
(b) Remove the vane pump shaft with pulley.
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PS–12POWER STEERING – VANE PUMP
PS
7. REMOVE VANE PUMP ROTOR
(a) Remove the 10 vane pump plates.
(b) Remove the vane pump rotor.
8. REMOVE VANE PUMP CAM RING
(a) Remove the vane pump cam ring from the vane
pump front housing.
9. REMOVE VANE PUMP FRONT SIDE PLATE
(a) Remove the vane pump front side plate from the
vane pump front housing.
(b) Using a screwdriver, remove the O-ring from the
vane pump front side plate.
HINT:
Tape the screwdriver tip before use.
(c) Remove the O-ring from the vane pump front
housing.
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