Lexus LX Istruzioni operative

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

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