Mitsubishi Lancer Evolution X. Manual - part 227

ON-VEHICLE SERVICE

TSB Revision

POWER STEERING

37-23

4. Move the ball joint stud several times and install the nut on 

the stud. Using the special tool MB990326, measure the ball 
joint rotation torque.

Standard value: 2.9 N⋅ m(26 in-lb) or less

5. If the rotation torque exceeds the standard value, replace 

the tie rod end (Refer to 

P.37-42

).

6. If the rotation torque is under the standard value, check the 

ball joint for end play or ratcheting. If no end play or 
ratcheting, the ball joint can be re-used.

7. Install the tie rod end to the knuckle, then tighten a new jam 

nut to the specified torque.

Tightening torque: 52 ± 2 N⋅ m (38 ± 1 ft-lb)

STATIONARY STEERING EFFORT CHECK

M1372001701067

1. Park the vehicle on a level paved road, position the steering 

wheel in the straight ahead position.

2. Start the engine, and maintain the engine speed at 1,000 ± 

100 r/min.

3. Position the spring scale on the circumference of the 

steering wheel, and measure the steering force at the time 
when the steering wheel is turned to right or left side (within 
the range of one and a half turns) from the center position.

Standard value:
Steering force: 32 N (7.2 lb) or less
Fluctuation band: 5.9 N (1.33 lb) or less

4. If not within the standard value, check and adjust the 

suspected components.

STEERING WHEEL RETURN TO CENTER CHECK

M1372001800793

Conduct a road test:
1. Make both gradual and sudden turns and check the steering 

wheel return. 

2. At a vehicle speed of approximately 22 mph (35 km/h), turn 

the steering wheel 90 degrees, hold a few seconds, then 
release. If the steering wheel then returns 70 degrees or 
more, the return can be judged satisfactory.
NOTE: There will be a momentary feeling or "heaviness" 
when the wheel is turned quickly, but this is not abnormal 
(Oil pump discharge amount is especially apt to be insuffi-
cient during idling). 

ACX01129 AB

MB990326

AC609390AB

AC609395

AB

70˚

70˚

ON-VEHICLE SERVICE

TSB Revision

POWER STEERING

37-24

DRIVE BELT TENSION CHECK

M1372001901180

Refer to GROUP 11A − On-vehicle service − Drive belt tension 

check 

P.11A-7

.

FLUID LEVEL CHECK

M1372002000756

1. Park the vehicle on a flat, level surface.
2. 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).

3. With the engine running, turn the wheel all the way to the left 

and right several times.

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, air bleeding should be done 
(Refer to 

P.37-25

).

FLUID REPLACEMENT

M1372002101273

1. Raise and support the front wheels.
2. Disconnect the return hose connection, and then connect a 

vinyl hose to the return hose, and drain the fluid into a 
container.

3. Disconnect the crank angle sensor connector.
4. While operating the starter motor intermittently, turn the 

steering wheel all the way to the left and right several times 
to drain all of the fluid.

5. Connect the return hose securely, and then secure with the 

clip.

6. Fill the oil reservoir with GENUINE MITSUBISHI POWER 

STEERING FLUID to the lower position of the filler, and then 
bleed the air (Refer to 

P.37-25

).

AC608306

With engine stopped

AC

Fluid level change: Within 5 mm (0.2 in)

With engine running

AC609396AB

Return hose

Container

AC705444 AB

Crank angle sensor

Oil filter

ON-VEHICLE SERVICE

TSB Revision

POWER STEERING

37-25

POWER STEERING SYSTEM AIR BLEEDING

M1372002201269

Perform air bleeding procedure as necessary after replacing 
the steering gear or the steering fluid lines.

Required Special Tools:

• MB991955: M.U.T.-III Sub Assembly

1. Raise and support the front wheels.
2. Disconnect the crank angle sensor connector.

CAUTION

Perform air bleeding only while cranking the engine. If air 
bleeding is performed while the engine is running, air 
could enter the fluid. During air bleeding, refill the steering 
fluid supply so that the level never falls below the lower 
mark on the dipstick.
3. Turn the steering wheel all the way to the left and right five 

or six times while using the starter motor to crank the engine 
intermittently several times (for 15 to 20 seconds).

4. Connect the crank angle sensor connector.
5. Start the engine (idling).
6. Turn the steering wheel to the left and right until there are no 

air bubbles in the oil reservoir.

7. Confirm that the fluid is not milky, and that the level is 

between the high and low dipstick marks.

8. Confirm that there is very little change in the fluid level when 

the steering wheel is turned left and right.

CAUTION

If the fluid level rises suddenly after the engine is stopped, 
the air has not been completely bled. If air bleeding is not 
complete, there will be abnormal noises from the pump 
and the flow-control valve, and this condition could cause 
reduce the life of the power steering components.
9. Confirm that the change in the fluid level is no more than 5 

mm (0.2 inch) when the engine is stopped and when it is 
running.

10.If the change of the fluid level is 5 mm (0.2 inch) or more, 

the air has not been completely bled from the system. The 
air bleeding procedure must be repeated.

AC705444 AB

Crank angle sensor

Oil filter

AC608306

With engine stopped

AC

Fluid level change: Within 5 mm (0.2 in)

With engine running

ON-VEHICLE SERVICE

TSB Revision

POWER STEERING

37-26

11.Use the scan tool MB991958, check if the DTC is set. If it is 

set, erase it.

OIL PUMP PRESSURE TEST

M1372002300962

Required Special Tools:

• MB990662: Power Steering Oil Pressure Gauge
• MB991548: Oil Pressure Gauge Adapter A (Pump Side)
• MB991549: Oil Pressure Gauge Adapter B (Hose Side)

1. Disconnect the pressure hose from the oil pump, and then 

connect the special tools MB991548, MB990662 and 
MB991549.

2. Bleed air, then turn the steering wheel several times while 

the vehicle is not moving so that the temperature of the fluid 
rises to approximately 50 − 60° C (122 − 140° F).

3. Start the engine and idle it at 700 ± 50 r/min.

CAUTION

The pressure gauge shut-off valve must not remain closed 
for more than 10 seconds.
4. Fully close the shut-off valve of the pressure gauge and 

measure the oil pump relief pressure to confirm that it is 
within the standard value range. Open it again immediately 
after checking the pressure.

Standard value: 8.1 − 8.8 MPa (1,175 − 1,276 psi)

5. If it is not within the standard value, replace the oil pump.
6. Check whether or not the hydraulic pressure is the standard 

value when no-load conditions are created by fully opening 
the shut-off valve of the pressure gauge.

Standard value: 1.0 MPa (145 psi)

7. If it is not within the standard value, the probable cause is a 

malfunction of the oil line or steering gear, so check these 
parts and repair as necessary.

AC608435 AI

V. C. I.

USB cable

Data link connector

M.U.T.-III main harness A

AC609397AC

Temperature

Oil reservoir

Power steering oil 
pressure gauge
(MB990662)

Shut-off valve

Oil
pump

Oil pressure 
gauge adapter B
(MB991549)

Oil pressure 
gauge 
adapter A
(MB991548)