Mitsubishi Galant. Manual — part 543

POWER STEERING DIAGNOSIS

TSB Revision

POWER STEERING

37A-3

3. Find the malfunction by following the Symptom

Chart.

4. Verify malfunction is eliminated.

SYMPTOM CHART

M1372007600043

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.

SYMPTOMS

INSPECTION
PROCEDURE

REFERENCE PAGE

Excessive play of steering wheel

1

P.37A-3

Difficult steering wheel operation (insufficient power assist)

2

P.37A-4

Rattling noise

3

P.37A-6

Shrill noise

4

P.37A-6

Squealing noise

5

P.37A-7

Hissing noise

6

P.37A-7

Droning noise

7

P.37A-7

Squeaking noise

8

P.37A-8

Vibration

9

P.37A-8

Oil leakage from hose connection

10

P.37A-9

Oil leakage from hose assembly

11

P.37A-9

Oil leakage from oil reservoir

12

P.37A-9

Oil leakage from oil pump

13

P.37A-10

Oil leakage from gear box

14

P.37A-10

POWER STEERING DIAGNOSIS

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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 pound) toward steering circumference and check
play.

Standard value (steering wheel play with engine
stopped): 10 mm (0.4 inch) or less

Q: Does the play exceed the standard value?

YES : Remove steering gear box (Refer to

P.37A-23

.) and

check total pinion torque (Refer to

P.37A-25

.). Then

go to Step 3.

NO : Go to Step 3.

STEP 3. Check steering wheel play.
Verify that the steering wheel play is not excessive.

Q: Is the steering wheel play excessive?

YES : Repeat to Step 1.
NO : Diagnosis is complete.

INSPECTION PROCEDURE 2 : Difficult steering wheel operation (insufficient power assist)

DIAGNOSIS

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

−

Drive Belts

P.00-

39

.

Q: Is the power steering belt tension within the standard

value?
YES : Go to Step 2.
NO : Adjust the tension. (Refer to GROUP 00,

Maintenance Service

−

Drive Belts

P.00-39

.) Then go

to Step 10.

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.

ACX01122AB

POWER STEERING DIAGNOSIS

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POWER STEERING

37A-5

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 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

P.37A-16

.)

Q: Is fluid foamy?

YES : Go to Step 10.
NO : Go to Step 4.

STEP 4. Check for entry of air.

Q: Has air entered?

YES : Bleed the air. Refer to

P.37A-16

. Then go to Step 10 .

NO : Go to Step 5.

STEP 5. Check each hose for crushing or twisting.

Q: Is there fault?

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

Alignment Check and Adjustment

P.33A-5

.

Q: Is there fault?

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.

ACX01131

WHILE ENGINE
RUNNING

WHILE ENGINE
STOPPED

AB

FLUID FLUCTUATION

POWER STEERING DIAGNOSIS

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POWER STEERING

37A-6

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

P.37A-14

.

Q: Is there fault?

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

STEP 10. Check steering wheel operation.
Verify that steering wheel operation is not difficult.

Q: Is the steering wheel operation difficult?

YES : Repeat to Step 1.
NO : Diagnosis is complete.

INSPECTION PROCEDURE 3: Rattling noise

DIAGNOSIS

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

Q: Is the oil pump and gear box 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 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 gear box.

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 to Step 1.

NO :

Diagnosis is complete.

INSPECTION PROCEDURE 4: Shrill noise

DIAGNOSIS

STEP 1. Check for entry of air.

Q: Has air entered?

YES :

Bleed the air. Refer to

P.37A-16

. 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. Check symptoms.
Confirm that no noise is generated.

Q: Is there noise?

YES :

Repeat to Step 1.

NO :

Diagnosis is complete.