Lexus RX300 (MCU15). Service manual — part 510
SR05N–04
SR–2
–
STEERING
TROUBLESHOOTING
LEXUS RX300 (RM785E)
TROUBLESHOOTING
PROBLEM SYMPTOMS TABLE
Use the table below to help you find the cause of the problem. The numbers indicate the priority of the likely
cause of the problem. Check each part in the order shown. If necessary, repair or replace these parts.
Symptom
Suspect Area
See page
Hard steering
11.Tires (Improperly inflated)
12.Power steering fluid level (Low)
13.Drive belt (Loose)
14.Front wheel alignment (Incorrect)
15.Steering system joints (Worn)
16.Suspension arm ball joints (Worn)
17.Steering column (Binding)
18.Power steering vane pump
19.Power steering gear
SA–2
SR–6
SR–3
SA–4
–
SA–37
–
SR–20
SR–31
Poor return
1. Tires (Improperly inflated)
2. Front wheel alignment (Incorrect)
3. Steering column (Binding)
4. Power steering gear
SA–2
SA–4
–
SR–31
Excessive play
1. Steering system joints (Worn)
2. Suspension arm ball joints (Worn)
3. Intermediate shaft, Universal joint (Worn)
4. Front wheel bearing (Worn)
5. Power steering gear
–
SA–37
–
SA–10
SR–31
Abnormal noise
1. Power steering fluid level (Low)
2. Steering system joints (Worn)
3. Power steering vane pump
4. Power steering gear
SR–6
–
SR–20
SR–31
P06717
SR1CB–01
F10520
Compressor
Clankshaft
Altenator
PS Vane Pump
Pulley
98 N (10 kgf, 22 lbf)
P06723
CORRECT
WRONG
WRONG
–
STEERING
DRIVE BELT
SR–3
LEXUS RX300 (RM785E)
DRIVE BELT
INSPECTION
INSPECT DRIVE BELT
(a)
Visually check the drive belt for excessive wear, frayed
cords etc.
If any defect has been found, replace the drive belt.
HINT:
Cracks on the rib side of a drive belt are considered acceptable.
If the missing chunks from the ribs are found on the drive belt,
it should be replaced.
(b)
Measure the drive belt deflection.
Drive belt tension: at 98 N (10 kgf, 22 lbf)
New belt: 7 – 9 mm (0.28 – 0.35 in.)
Used belt: 10 – 12 mm (0.39 – 0.47 in.)
If the belt defection is not as specified, adjust it.
HINT:
S
”New belt” refers to a belt which has been used less than
5 minutes on a running engine.
S
”Used belt” refers to a belt which has been used on a run-
ning engine for 5 minutes or more.
S
After installing a belt, check that it fits properly in the
ribbed grooves.
S
Check with your hand to confirm that the belt has not
slipped out of the groove on the bottom of the pulley.
S
After installing a new belt, run the engine for about 5 min-
utes and recheck the belt tension.
Z11352
SR–4
–
STEERING
DRIVE BELT
LEXUS RX300 (RM785E)
S
Reference:
Using a belt tension gauge, measure the drive belt ten-
sion.
Drive belt tension:
New belt: 690 – 780 N (70 – 80 kgf)
Used belt: 350 – 490 N (35 – 50 kgf)
If the belt tension is not as specified, adjust it.
SR05P–12
R11741
Normal
Abnormal
–
STEERING
POWER STEERING FLUID
SR–5
LEXUS RX300 (RM785E)
POWER STEERING FLUID
BLEEDING
1.
CHECK FLUID LEVEL (See page SR–6)
2.
JACK UP FRONT OF VEHICLE AND SUPPORT IT
WITH STANDS
3.
TURN STEERING WHEEL
With the engine stopped, turn the steering wheel slowly from
lock to lock several times.
4.
LOWER VEHICLE
5.
START ENGINE
Run the engine at idle for a few minutes.
6.
TURN STEERING WHEEL
(a)
With the engine idling, turn the steering wheel to left or
right full lock position and keep it there for 2 – 3 seconds,
then turn the wheel to the opposite full lock position and
keep it there for 2 – 3 seconds.
(b)
Repeat (a) several times.
7.
STOP ENGINE
8.
CHECK FOR FOAMING OR EMULSIFICATION
If the system has to be bled twice specifically because of foam-
ing or emulsification, check for fluid leaks in the system.
9.
CHECK FLUID LEVEL (See page SR–6)
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