Mitsubishi Evolution X. Manual - part 871

 

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Mitsubishi Evolution X. Manual - part 871

 

 

POWER STEERING DIAGNOSIS

TSB Revision

POWER STEERING

37-7

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 33, On-vehicle Service 

− Front Wheel Align-

ment Check and Adjustment 

P.33-7

.

Q: Is the alignment incorrect?

YES : Repair it. Then go to Step 10.
NO :  Go to Step 8.

STEP 8. Check the gear box rack piston seal for damage.
Q: Is there damage?

YES : Replace it. Then go to Step 10.
NO :  Go to Step 9.

STEP 9. Check for excessive tie rod end ball joint 
breakaway torque.
Refer to 

P.37-15

.

Q: Is there fault?

YES : Replace the part. Then go to Step 10.
NO :  Go to Step 10.

STEP 10. Check the steering wheel operation.
Verify that the steering wheel operation is not difficult.
Q: Is the steering wheel operation difficult?

YES : Repeat from Step 1.
NO :  The procedure is complete.

INSPECTION PROCEDURE 3: Rattling Noise

DIAGNOSIS

STEP 1. Check for proper oil pump and steering 
gear installation.

Q: Is the oil pump and the steering gear installation 

correct?
YES : 

Go to Step 2.

NO : 

Repair it. Then go to Step 4.

STEP 2. Check for interference of other parts with 
the steering column and the power steering 
hoses.

Q: Is there interference?

YES : 

Correct the interference. Then go to Step 4.

NO : 

Go to Step 3.

STEP 3. Check for noise from inside the oil pump 
or the steering gear.

Q: Is there noise?

YES : 

Replace the part. Then go to Step 4.

NO : 

Go to Step 4.

STEP 4. Check for rattling noise.
Confirm that no noise is generated.

Q: Is there noise?

YES : 

Repeat from Step 1. 

NO : 

The procedure is complete.

POWER STEERING DIAGNOSIS

TSB Revision

POWER STEERING

37-8

INSPECTION PROCEDURE 4: Shrill Noise

DIAGNOSIS

STEP 1. Check for entry of air.

Q: Is the power steering fluid foamy?

YES : 

Bleed the air (Refer to 

P.37-19

). Then go to 

Step 3.

NO : 

Go to Step 2.

STEP 2. Check for seizure in the oil pump.

Q: Is there seizure?

YES : 

Replace the part. Then go to Step 3.

NO : 

Go to Step 3.

STEP 3. Retest the system.
Confirm that no noise is generated.

Q: Is there noise?

YES : 

Repeat from Step 1.

NO : 

The procedure is complete.

INSPECTION PROCEDURE 5: Squealing Noise

DIAGNOSIS

STEP 1. Check the drive belt tension.
Refer to GROUP 00, Maintenance Service 

− Drive 

Belts 

P.00-66

.

Q: Is the drive belt tension incorrect?

YES : 

Adjust the belt tension (Refer to GROUP 00, 

Maintenance Service 

− Drive Belts 

P.00-66

). 

Then go to Step 3.

NO : 

Go to Step 2.

STEP 2. Check for seizure in the oil pump.

Q: Is there seizure?

YES : 

Replace the part. Then go to Step 3.

NO : 

Go to Step 3.

STEP 3. Retest the system.
Confirm that no noise is generated.

Q: Is there noise?

YES : 

Repeat from Step 1.

NO : 

The procedure is complete.

INSPECTION PROCEDURE 6: Hissing Noise

DIAGNOSIS

STEP 1. Check for entry of air.

Q: Is the power steering fluid foamy?

YES : 

Bleed the air (Refer to 

P.37-19

). Then go to 

Step 4.

NO : 

Go to Step 2.

STEP 2. Check each hose for crushing or 
twisting.

Q: Is any hose crushed or twisted?

YES : 

Repair or replace the hose. Then go to Step 

4.

NO : 

Go to Step 3.

STEP 3. Check the steering gear for damage.

Q: Is there damage?

YES : 

Repair or replace the part. Then go to Step 

4.

NO : 

Go to Step 4.

STEP 4. Retest the system.
Confirm that no noise is generated.

Q: Is there noise?

YES : 

Repeat from Step 1.

NO : 

The procedure is complete.

POWER STEERING DIAGNOSIS

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POWER STEERING

37-9

INSPECTION PROCEDURE 7: Droning Noise

DIAGNOSIS

STEP 1. Check the oil pump or oil pump bracket 
installation.

Q: Is the oil pump or the oil pump bracket installation 

correct?
YES : 

Go to Step 2.

NO : 

Repair it. Then go to Step 3.

STEP 2. Check the oil pump for damage.
NOTE: If a slight "beat noise" is produced by the oil 
pump when the steering wheel is turned fully and 
held in that position, this is not a malfunction.

Q: Is there damage?

YES : 

Replace the oil pump. Then go to Step 3.

NO : 

Go to Step 3.

STEP 3. Retest the system.
Confirm that no noise is generated.

Q: Is there noise?

YES : 

Repeat from Step 1.

NO : 

The procedure is complete.

INSPECTION PROCEDURE 8: Squeaking Noise

DIAGNOSIS

STEP 1. Check for interference of the wheel and the 
vehicle body.
If interfering, adjust the steering angle.

AC000756AB

(1) Place the front wheel on a turning radius gauge and 

measure the steering angle.

Standard value:

Item

Specification

Inside wheel

33

° 10' ± 1° 30'

Outside wheel (reference 
value)

28

° 10'

(2) If the steering angle is not within the standard value, adjust 

the toe-in.

Standard value: 0 

± 2 mm (0 ± 0.07 inch)

AC705438 AB

Clip

Lock nut

(3) Adjust the toe-in by undoing the clip and jam nut, and 

turning the left and right tie rod turnbuckles by the same 
amount (in opposite directions).
NOTE: The toe will move out as the left turnbuckle is turned 
toward the front of the vehicle and the right turnbuckle is 
turned toward the rear of the vehicle.

Q: Is the steering angle normal?

YES : Go to Step 2.
NO :  Adjust the steering angle. Then go to Step 3.

POWER STEERING DIAGNOSIS

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POWER STEERING

37-10

STEP 2. Check the steering gear for damage.
Q: Is there damage?

YES : Repair or replace the part. Then go to Step 3.
NO :  Go to Step 3.

STEP 3. Retest the system.
Confirm that no noise is generated.
Q: Is there noise?

YES : Repeat from Step 1.
NO :  The procedure is complete.

INSPECTION PROCEDURE 9: Vibration

NOTE: A slight vibration may be felt when the stationary steering effort is made due to the condition of the 
road surface. To check whether the vibration actually exists or not, test-drive the vehicle on a dry concrete or 
asphalt surface. A very slight amount of vibration is not a malfunction.
DIAGNOSIS

STEP 1. Check for entry of air.

Q: Is the power steering fluid foamy?

YES : 

Bleed the air (Refer to 

P.37-19

). Then go to 

Step 3.

NO : 

Go to Step 2.

STEP 2. Check the steering gear for damage.

Q: Is there damage?

YES : 

Repair or replace the part. Then go to Step 

3.

NO : 

Go to Step 3.

STEP 3. Retest the system.
Confirm that no vibration is generated.

Q: Is there vibration?

YES : 

Repeat from Step 1.

NO : 

The procedure is complete.

INSPECTION PROCEDURE 10: Oil Leakage from Hose Connection

DIAGNOSIS

STEP 1. Check for loosening of the return tube 
flare nut.

Q: Is the flare nut loose?

YES : 

Tighten it to 15 

± 3 N⋅ m (11 ± 2 ft-lb). Then 

go to Step 3.

NO : 

Go to Step 2.

STEP 2. Check the hose connection and the 
clamp installation.

Q: Are they correct?

YES : 

Go to Step 3.

NO : 

Repair or replace the part. Then go to Step 
3.

STEP 3. Retest the system.
Check that no oil is leaking.

Q: Is there oil leakage?

YES : 

Repeat from Step 1.

NO : 

The procedure is complete.

 

 

 

 

 

 

 

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