Lexus LX Operating instructions

POWER STEERING SYSTEM > PRECAUTION
for Preparation Click here
1.HANDLING PRECAUTIONS ON STEERING SYSTEM
a. Care must be taken when replacing parts. Incorrect replacement may affect the performance of the steering system and result in driving
hazards.
2.HANDLING PRECAUTIONS ON SRS AIRBAG SYSTEM
a. The vehicle is equipped with an SRS (Supplemental Restraint System) such as the driver airbag and front passenger airbag. Failure to carry
out service operations in the correct sequence could cause the SRS to unexpectedly deploy during servicing. This may cause a serious
accident. Before servicing (including inspection, replacement, removal and installation of parts), be sure to read the precautionary notices for
the supplemental restraint system (Click here).

POWER STEERING SYSTEM > SYSTEM DESCRIPTION
for Preparation Click here

POWER STEERING SYSTEM > PROBLEM SYMPTOMS TABLE
for Preparation Click here
HINT:
Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms
are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they
are listed. Replace parts as necessary.
Power Steering System
Symptom Suspected Area See page
Hard steering
Tires (Improperly inflated) Click here
Power steering fluid level (Low) Click here
Drive belt (Loose) Click here
Front wheel alignment (Incorrect) Click here
Steering system joints (Worn) -
Suspension arm ball joints (Worn) Click here
Steering column (Binding) -
Power steering vane pump Click here
Power steering gear Click here
Poor return
Tires (Improperly inflated) Click here
Front wheel alignment (Incorrect) Click here
Steering column (Binding) -
Power steering gear Click here
Excessive play
Steering system joints (Worn) -
Suspension arm ball joints (Worn) Click here
Intermediate shaft, sliding yoke (Worn) -
Front wheel bearing (Worn) Click here
Power steering gear Click here
Abnormal noise
Power steering fluid level (Low) Click here
Steering system joints (Worn) -
Power steering vane pump Click here
Power steering gear Click here

POWER STEERING SYSTEM > ON-VEHICLE INSPECTION
for Preparation Click here
1. INSPECT DRIVE BELT
a. Visually check the belt for excessive wear, frayed cords, etc.
If any defect is found, replace the drive belt.
HINT:
Cracks on the rib side of a belt are considered acceptable. Replace the belt if
there are any missing ribs.
b. Check by hand that the belt fits properly in the ribbed grooves and has not
slipped out of the grooves on the bottom of the crank pulley.
2. BLEED POWER STEERING SYSTEM
a. Check the fluid level.
b. Jack up the front of the vehicle and support it with stands.
c. Turn the steering wheel.
i. With the engine stopped, turn the wheel slowly from lock to lock several times.
d. Lower the vehicle.
e. Start the engine.
f. Idle the engine for a few minutes.
g. Turn the steering wheel.
i. With the engine idling, turn the wheel left or right to the full lock position and keep it there for 2 to 3 seconds, then turn the wheel to
the opposite full lock position and keep it there for 2 to 3 seconds.*1
ii. Repeat *1 several times.
NOTICE:
For vehicles with VGRS, if the steering wheel is turned from lock to lock repeatedly, the system may stop operating and the
amount of rotation before the steering wheel locks may increase due to operation of the overheating prevention function. When
the system temperature drops, the system operation automatically returns to normal.
h. Stop the engine.
i. Check for foaming or emulsification.

If the system has to be bled twice because of foaming or emulsification, check
for fluid leaks in the system.
j. Check the fluid level.
3. CHECK FLUID LEVEL
a. Keep the vehicle horizontal.
b. With the engine stopped, check the fluid level in the reservoir.
If necessary, add fluid.
Fluid:
ATF DEXRON II or III
HINT:
If the fluid is hot, check that the fluid level is within the HOT range. If the fluid
is cold, check that the fluid level is within the COLD range.
c. Start the engine and idle it.
d. Turn the steering wheel from lock to lock several times to raise the fluid temperature.
Fluid temperature:
80°C (176°F)
e. Check for foaming or emulsification.
If foaming or emulsification is identified, bleed the power steering system.
f. With the engine idling, measure the fluid level in the reservoir.
g. Stop the engine.
h. Wait a few minutes and remeasure the fluid level in the reservoir.
Maximum fluid level rise:
5.0 mm (0.197 in.)
If the fluid level rise is more than the maximum, bleed the power steering
system.
i. Check the fluid level.
4. CHECK STEERING FLUID PRESSURE
a. Disconnect the pressure feed tube from the vane pump ( Click here).

b. Connect SST as shown in the illustration.
SST
09640-10010 (09641-01010, 09641-01030, 09641-01060)
NOTICE:
Make sure that the valve of SST is in the open position.
c. Bleed the power steering system.
d. Start the engine and idle it.
e. Turn the steering wheel from lock to lock several times to raise the fluid temperature.
Fluid temperature:
80°C (176°F)
f. With the engine idling, close the valve of SST and observe the reading on SST.
Standard fluid pressure:
10000 to 10700 kPa (102 to 109 kgf/cm 2, 1450 to 1552 psi)
NOTICE:
Do not keep the valve closed for more than 10 seconds.
Do not allow the fluid temperature to become too high.
If the pressure is less than the standard, check for fluid leaks and replace parts
as necessary.
g. With the engine idling, fully open the valve.
h. Measure the fluid pressure at engine speeds of 1000 rpm and 3000 rpm.
Difference in fluid pressure:
500 kPa (5.1 kgf/cm2, 73 psi) or less
NOTICE:
Do not turn the steering wheel.
If the pressure difference is above the specified range, check for fluid leaks and
replace parts as necessary.

i. With the engine idling and the valve fully open, turn the steering wheel left or
right to the full lock position. Observe the reading on SST.
Standard fluid pressure:
10000 to 10700 kPa (102 to 109 kgf/cm 2, 1450 to 1552 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.
If the pressure is less than the standard, check for fluid leaks and replace parts
as necessary.
j. Disconnect SST.
SST
09640-10010 (09641-01010, 09641-01030, 09641-01060)
k. Connect the pressure feed tube (Click here).
l. Bleed the power steering system.

VANE PUMP > COMPONENTS
for Preparation Click here
1 / 2

2 / 2

VANE PUMP > REMOVAL
for Preparation Click here
1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
NOTICE:
w/ Navigation System:
After the engine switch is turned off, the HDD navigation system requires approximately 6 minutes to record various types of memory and settings. As
a result, after turning the engine switch off, wait 6 minutes or more before disconnecting the cable from the negative (-) battery terminal.
2. REMOVE FRONT WHEEL RH
3. REMOVE FRONT FENDER APRON SEAL FRONT RH
a. Using a clip remover, remove the 3 clips and fender apron seal.
4. REMOVE V-BANK COVER SUB-ASSEMBLY
a. Raise the front of the V-bank cover to detach the 3 pins. Then remove the 2 V-
bank cover hooks from the bracket, and remove the V-bank cover.
5. REMOVE AIR CLEANER HOSE ASSEMBLY

a. Disconnect the vacuum hose and No. 2 ventilation hose.
b. Loosen the 2 hose clamps.
c. Remove the air cleaner hose.
6. REMOVE AIR CLEANER ASSEMBLY
a. Remove the 3 bolts and air cleaner.
7. REMOVE FAN & GENERATOR V BELT
a. While turning the belt tensioner counterclockwise, align the service hole for the
belt tensioner and the belt tensioner fixing position, and then insert a bar of φ5
mm (0.197 in.) into the service hole to fix the belt tensioner in place.
HINT:
The pulley bolt for the belt tensioner has a left-hand thread.
b. Remove the V belt.
8. DRAIN POWER STEERING FLUID
9. DISCONNECT SUCTION HOSE

a. Slide the clip and disconnect the suction hose from the vane pump.
10. DISCONNECT POWER STEERING OIL PRESSURE SENSOR CONNECTOR
a. Detach the wire harness clamp and disconnect the connector.
11. DISCONNECT PRESSURE FEED TUBE
a. Remove the bolt and disconnect the pressure feed tube.
b. Remove the gasket.
12. REMOVE VANE PUMP ASSEMBLY
a. Remove the 2 bolts and vane pump.

VANE PUMP > DISASSEMBLY
for Preparation Click here
1. FIX VANE PUMP ASSEMBLY
a. Using SST, fix the vane pump in a vise.
SST
09630-00014 (09631-00132)
2. REMOVE POWER STEERING SUCTION PORT UNION
a. Remove the bolt and suction port union from the vane pump.
b. Using a screwdriver, remove the O-ring from the suction port union.
3. REMOVE FLOW CONTROL VALVE
a. Remove the pressure port union.
b. Remove the O-ring from the pressure port union.
c. Remove the flow control valve and compression spring.
4. REMOVE VANE PUMP REAR HOUSING
a. Remove the 4 bolts and rear housing from the front housing.

b. Using a screwdriver, remove the O-ring from the rear housing.
HINT:
Tape the screwdriver tip before use.
5. REMOVE VANE PUMP SHAFT WITH VANE PUMP PULLEY
a. Using 2 screwdrivers, remove the snap ring from the vane pump shaft.
b. Remove the vane pump shaft with vane pump pulley.
NOTICE:
Be careful not to drop or damage the vane pump shaft with vane pump pulley.
If it is damaged, replace the vane pump assembly.
6. REMOVE VANE PUMP ROTOR
a. Remove the 10 vane pump plates.
NOTICE:
Take care not to drop the vane pump plate.
b. Remove the vane pump rotor.
7. REMOVE VANE PUMP CAM RING
a. Remove the cam ring from the front housing.

8. REMOVE VANE PUMP FRONT SIDE PLATE
a. Remove the front side plate from the front housing.
b. Using a screwdriver, remove the O-ring from the front side plate.
HINT:
Tape the screwdriver tip before use.
c. Remove the O-ring from the front housing.
9. REMOVE VANE PUMP HOUSING OIL SEAL
a. Using a screwdriver and piece of cloth, pry out the oil seal.
NOTICE:
Be careful not to damage the front housing.