Mitsubishi Lancer Evolution X. Manual - part 222

GENERAL INFORMATION

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POWER STEERING

37-3

GENERAL INFORMATION

M1372000101482

• The steering wheel has three spokes. All vehicles 

are equipped with SRS (Supplemental Restraint 
System).

• The steering column has a shock absorbing 

mechanism and a tilt steering mechanism.

• The steering system uses a vane oil pump with a 

fluid flow control system, so that steering effort 
varies with engine speed.

GENERAL SPECIFICATIONS

M1372000200538

AC710604 AD

Steering wheel
assembly

Steering column 
shaft assembly

Pressure hose 
assembly

Oil reservoir

Suction hose

Oil pump assembly

Steering gear and linkage

Return hose

Front axle crossmember

Heat protector

Pressure switch 

Cooler tube assembly

Item

Specification

Steering wheel

Type

Three-spoke type

Outside diameter mm (in)

365 (14.4)

Maximum number of turns

3.16

Steering column

Column mechanism

Shock absorbing mechanism 
and Tilt steering mechanism

Power steering type

Integral type (Engine 
speed-dependent type)

Oil pump

Type

Vane type

Basic discharge amount cm

3

/rev. (cu 

in/rev)

9.0 (0.55)

Reservoir type

Separate type (Resin made)

Steering gear

Type

Rack and pinion

Stroke ratio (Rack stroke/Steering wheel 
maximum turning radius) mm/rev (in/rev)

65.97 (2.6)

Rack stroke mm (in)

150 (5.9)

SERVICE SPECIFICATIONS

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POWER STEERING

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SERVICE SPECIFICATIONS

M1372000301981

LUBRICANTS

M1372000400855

Item

Standard value

Limit

Steering wheel free 
play mm (in)

With engine running

−

30 (1.2) or 
less

With engine stopped

16.5 (0.65) or less

−

Steering angle

Inner wheel

33° 10' ± 1° 30'

(Left/right deviation 
within 2° 00’)

−

Outer wheel (reference value)

28° 10'

−

Toe-in mm (in)

0 ± 2 (0 ± 0.08)

−

Tie rod end ball joint breakaway torque N⋅ m (in-lb)

2.9 (26) or less

−

Engine idle speed r/min

700 ± 100

−

Stationary steering effort N (lb) [Fluctuation allowance N (lb)]

32 (7.2) or less
[5.9 (1.33) or less]

−

Oil pump pressure 
MPa (psi)

Oil pump relief pressure

8.1 − 8.8 (1,175 − 1,276) −

Pressure under no-load conditions

1.0 (145)

−

Steering gear retention hydraulic pressure 8.1 − 8.8 (1,175 − 1,276) −

Oil pressure switch 
operating pressure 
MPa (psi)

OFF → ON

2.5 − 3.0 (363 − 435)

−

ON → OFF

1.5 − 3.0 (218 − 435)

−

Steering gear total pinion torque N⋅ m (in-lb) [Change in torque 

N⋅ m (in-lb)]

0.6 − 1.6 (5.3 − 14.2)

[0.4 (3.5) or less]

−

Band crimped width mm (in)

2.4 − 2.8 (0.09 − 0.11)

−

Item

Specified lubricant

Quantity dm

3

 (qt)

Power steering fluid

Genuine MITSUBISHI power 
steering fluid or ATF DEXRON 
III or DEXRON II

1.0 (1.06)

Steering gear

Bearing

Genuine MITSUBISHI power 
steering fluid or ATF DEXRON 
III or DEXRON II

As required

O-ring and seal ring
Oil seal
Special tool (MB991213)
Pinion and valve assembly 
seal ring part
Bellows

Silicon grease

As required

Oil pump

Friction surface of rotor vane, 
cam ring and pump cover

Genuine MITSUBISHI power 
steering fluid or ATF DEXRON 
III or DEXRON II

As required

O-ring

SEALANT

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POWER STEERING

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SEALANT

M1372000500896

POWER STEERING DIAGNOSIS

INTRODUCTION TO POWER STEERING DIAGNOSIS

M1372008500254

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 DIAGNOSIS TROUBLESHOOTING STRATEGY

M1372007300291

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.

SYMPTOM CHART

M1372007600366

Item

Specified sealant

Quantity dm

3

 (qt)

Steering gear

Bellows

3M™ AAD Part No.8663 or 

equivalent

As required

Symptom

Inspection 
procedure

Reference page

Excessive play of steering wheel

1

P.37-6

Difficult steering wheel operation (insufficient power assist)

2

P.37-7

Rattling noise

3

P.37-8

Shrill noise

4

P.37-9

Squealing noise

5

P.37-9

Hissing noise

6

P.37-9

Droning noise

7

P.37-10

Squeaking noise

8

P.37-11

Vibration

9

P.37-12

Oil leakage from hose connection

10

P.37-12

Oil leakage from hose assembly

11

P.37-12

Oil leakage from oil reservoir

12

P.37-13

Oil leakage from oil pump

13

P.37-13

Oil leakage from steering gear

14

P.37-13

POWER STEERING DIAGNOSIS

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POWER STEERING

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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.

STEP 2. Check the steering wheel free play.
(1) With the engine running (hydraulic operation), set the front 

wheels straight ahead.

(2) Measure the play on the steering wheel circumference 

before the wheels start to move when slightly moving the 
steering wheel in both directions.

Limit: 30 mm (1.2 inch) or less

(3) If the free play exceeds the limit value, set the steering 

wheel straight ahead with the engine stopped. Load 
approximately 5 N (1.1 pound) towards the steering 
circumference and check the play.

Standard value (steering wheel play with engine 
stopped): 16.5 mm (0.65 inch) or less

Q: Does the play exceed the standard value?

YES : Remove the steering gear box (Refer to 

P.37-38

) and 

check the total pinion torque (Refer to 

P.37-38

). Then 

go to Step 3.

NO :  Go to Step 3.

STEP 3. Check the 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.