Mitsubishi Montero (2004+). Manual — part 1153

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

STEERING COLUMN AND SHAFT

STEERING GEAR AND LINKAGE

RESERVOIR TANK

POWER STEERING DIAGNOSIS

TSB Revision

POWER STEERING

37A-3

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

P.37A-3

Difficult steering wheel operation (insufficient power assist) 2

Rattling noise

Shrill noise

Squealing noise

Hissing noise

Droning noise

Squeaking noise

Vibration

Oil leakage from hose connection

P.37A-10

Oil leakage from hose assembly

P.37A-10

Oil leakage from oil reservoir

P.37A-11

Oil leakage from oil pump

P.37A-11

Oil leakage from gear box

P.37A-11

POWER STEERING DIAGNOSIS

TSB Revision

POWER STEERING

37A-4

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

P.37A-27

.) Then go to Step 3.

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

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Mitsubishi Montero (2004+). Manual — part 1153

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