Mitsubishi Montero (2002-2004). Manual — part 429
GENERAL DESCRIPTION
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POWER STEERING
37A-3
.
GENERAL DESCRIPTION
M1372000100230
The vehicle uses engine speed-responsive hydraulic
power steering.
The steering wheel has four spokes. All vehicles are
equipped with SRS (Supplemental Restraint Sys-
tem).
The steering column has a shock absorber mecha-
nism and a tilt steering mechanism.
A vane-type oil pump with a fluid flow control system
has been included. The steering gear and linkage is
rack and pinion type.
CONSTRUCTION DIAGRAM
POWER STEERING DIAGNOSIS
INTRODUCTION TO POWER STEERING DIAGNOSIS
M1372008500179
Hydraulic power steering is used for all vehicles.
Faults in the power steering can include excessive
play of the steering wheel, difficult steering wheel
operation, noise, vibration, and oil leaks, etc. Possi-
ble causes of these faults can include defects in the
gear box, oil pump or steering linkage.
POWER STEERING DIAGNOSTIC TROUBLESHOOTING STRATEGY
M1372007300172
Use these steps to plan your diagnostic strategy. If
you follow them carefully, you will be sure that you
have exhausted most of the possible ways to find a
power steering fault.
1. Gather information from the customer.
2. Verify that the condition described by the
customer exists.
3. Find the malfunction by following the Symptom
Chart.
4. Verify malfunction is eliminated.
AC000757
RETURN HOSE
PRESSURE HOSE
STEERING
WHEEL
OIL PUMP
SUCTION HOSE
AB
STEERING COLUMN AND SHAFT
STEERING GEAR AND LINKAGE
RESERVOIR TANK
POWER STEERING DIAGNOSIS
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POWER STEERING
37A-4
SYMPTOM CHART
M1372007600173
SYMPTOM PROCEDURES
INSPECTION PROCEDURE 1: Excessive Play of Steering Wheel
.
DIAGNOSIS
STEP 1. Check for looseness at the steering shaft coupling
section and at the steering wheel linkage.
Q: Is there any looseness?
YES : Repair or replace the part. Then go to Step 3.
NO : Go to Step 2.
SYMPTOM
INSPECTION
PROCEDURE
REFERENCE PAGE
Excessive play of steering wheel
1
Difficult steering wheel operation (insufficient power
assist)
2
Rattling noise
3
Shrill noise
4
Squealing noise
5
Hissing noise
6
Droning noise
7
Squeaking noise
8
Vibration
9
Oil leakage from hose connection
10
Oil leakage from hose assembly
11
Oil leakage from oil reservoir
12
Oil leakage from oil pump
13
Oil leakage from gear box
14
POWER STEERING DIAGNOSIS
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POWER STEERING
37A-5
STEP 2. Check the steering wheel free play.
(1) With engine running (hydraulic operation), set front wheels
straight ahead.
(2) Measure the play on steering wheel circumference before
wheels start to move when slightly moving the steering
wheel in both directions.
Limit: 30 mm (1.2 inches)
(3) If the free play exceeds the limit value, set steering wheel
straight ahead with engine stopped. Load approximately 5
N (1.1 lb) toward steering circumference and check play.
Standard value (steering wheel play with engine
stopped): 10 mm (0.3 inch) or less
Q: Does the play exceed the standard value?
YES : Remove steering gear box and check total pinion
torque (Refer to
NO : There is no action to be taken.
STEP 3. Check steering wheel play.
Verify that the steering wheel play is not excessive.
Q: Is the steering wheel play excessive?
YES : Repeat from Step 1.
NO : The procedure is complete.
INSPECTION PROCEDURE 2: Difficult Steering Wheel Operation (Insufficient Power Assist)
.
DIAGNOSIS
STEP 1. Check the power steering belt tension.
CAUTION
Perform the check after rotating the engine in the normal
direction (one revolution or more).
NOTE: Since the auto-tensioner is used, it is not necessary to
adjust the tension of the belt.
(1) Check that the indicator mark of the auto-tensioner is
located between the marks shown as "A" on the tensioner
bracket.
(2) If the mark is located out of the space "A," replace the drive
belt.
Q: Is the indicator mark of the auto-tensioner located
between the marks shown as "A" on the tensioner
bracket?
YES : Go to Step 2.
NO : Replace the drive belt or auto-tensioner. Then go to
Step 10.
ACX01122 AB
ACX00751AB
INDICATOR MARK
A
POWER STEERING DIAGNOSIS
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POWER STEERING
37A-6
STEP 2. Check the belt for damage.
Q: Is the belt damaged?
YES : Replace the belt. Then go to Step 10.
NO : Go to Step 3.
STEP 3. Check the fluid level.
(1) Park the vehicle on a flat, level surface, start the engine,
and then turn the steering wheel several times in both
directions to raise the temperature of the fluid to
approximately 50
− 60°C (122 − 140°F).
(2) With the engine running, turn the wheel all the way to the
left and right several times.
(3) Check the fluid in the oil reservoir for foaming or milkiness.
Check the difference of the fluid level when the engine is
stopped, and while it is running. If the change of the fluid
level is 5 mm (0.2 inch) or more, bleed air from the system.
(Refer to
.)
Q: Is fluid foamy?
YES : Go to Step 4.
NO : Go to Step 10.
STEP 4. Check for entry of air.
Q: Has air entered?
YES : Bleed the air. Refer to
. Then go to Step 10.
NO : Go to Step 5.
STEP 5. Check each hose for crushing or twisting.
Q: Is any hose crushed or twisted?
YES : Repair or replace the hose. Then go to Step 10.
NO : Go to Step 6.
STEP 6. Check for oil leaks.
Q: Are there oil leaks?
YES : Repair it. Then go to Step 10.
NO : Go to Step 7.
STEP 7. Check the wheel alignment (camber and caster).
Refer to GROUP 33A, On-vehicle Service
− Front Wheel Align-
ment Check and Adjustment
.
Q: Is the camber or caster out of specification?
YES : Adjust it. Then go to Step 10.
NO : Go to Step 8.
ACX01131
WHILE ENGINE
RUNNING
WHILE ENGINE
STOPPED
AB
FLUID FLUCTUATION
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