Mitsubishi Outlander XL. Manual - part 704

POWER STEERING DIAGNOSIS TROUBLESHOOTING STRATEGY

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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

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SYMPTOM

INSPECTION
PROCEDURE

REFERENCE PAGE

Excessive play of steering wheel

1

 P.37-5

Difficult steering wheel operation (insufficient power assist)

2

 P.37-6

Rattling noise

3

 P.37-8

Shrill noise

4

 P.37-8

Squealing noise

5

 P.37-8

Hissing noise

6

 P.37-9

Droning noise

7

 P.37-9

Squeaking noise

8

 P.37-10

Vibration

9

 P.37-10

Oil leakage from hose connection

10

 P.37-11

Oil leakage from hose assembly

11

 P.37-11

Oil leakage from oil reservoir

12

 P.37-11

Oil leakage from oil pump

13

 P.37-12

Oil leakage from steering gear

14

 P.37-12

SYMPTOM PROCEDURES

INSPECTION PROCEDURE 1: Excessive Play of Steering Wheel

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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.

POWER STEERING

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POWER STEERING DIAGNOSIS

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(2)

Measure the play on the steering wheel circumference before
the wheels start to move when moving the steering wheel
slightly in both directions.

Limit: 30 mm (1.2 inch)

(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 (0.6 inch) or less

Q:Does the play exceed the standard value?

YES:

 Remove the steering gear box (Refer to P.37-28)

and check the total pinion torque (Refer to P.37-31).
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 to Step 1.

NO:

 The procedure is complete.

INSPECTION PROCEDURE 2: Difficult Steering Wheel Operation (Insufficient Power
Assist)

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DIAGNOSIS
STEP 1. Check the power steering oil pump drive belt
tension.
Refer  to  GROUP  11A,  Drive  belt  tension  check  and
adjustment P.11A-9.

Q:Is the power steering oil pump drive belt tension within

the standard value?

YES:

 Go to Step 2.

NO:

 Adjust the tension. (Refer to GROUP 11A, Drive belt

tension check and adjustment P.11A-9.) Then go to Step 10.

STEP 2. Check the drive belt for damage.

Q:Is the drive belt damaged?

YES:

 Replace the drive 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, and then start the
engine.

(2)

Turn  the  steering  wheel  several  times  to  raise  the
temperature of the fluid to approximately 50 - 60°C (122 -
140°F).

(3)

With the engine running, turn the wheel all the way to the left
and right several times.

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POWER STEERING

POWER STEERING DIAGNOSIS

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With engine running

With engine stopped

Fluid level change: Within 5 mm (0.2 in)

(4)

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 the air from the system.
(Refer to P.37-18.)

Q:Is the 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 P.37-18). 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  33,  On-vehicle  Service  -  Front  Wheel
Alignment 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 steering gear and linkage 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.

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POWER STEERING DIAGNOSIS

INSPECTION PROCEDURE 3: Rattling Noise

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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.

INSPECTION PROCEDURE 4: Shrill Noise

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DIAGNOSIS

STEP 1. Check for entry of air.

Q:Is the power steering fluid foamy?

YES:

 Bleed the air (Refer to P.37-18). 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

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DIAGNOSIS

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POWER STEERING

POWER STEERING DIAGNOSIS