2007 MITSUBISHI LANCER EVOLUTION differential

REAR AXLE -Special Tools27B-6
ToolNumberNameUse
MB990685Torque wrenchMeasurement of the starting torque of wheel
bearing
MB990326Preload socket
MB991113 or
MB990635Steering linkage
pullerDisconnection of ball joint
MB990641Lower arm bush
(A) remover & in-
stallerRemoval and press-fitting of differential
support member bush
MB991439Bush remover &
installerRemoval and press-fitting of differential
support arm bush
MB991460PlugPrevention of differential oil from being
discharged and entry of foreign matter differential>
MB990909Working baseSupporting of the differential carrier
MB991116AdapterSupport of differential carrier assembly
MB990810Side bearing pullerDRemoval of the side bearing inner race
DRemoval of the companion flange

REAR AXLE -Troubleshooting REAR AXLE -Troubleshooting 27B-14
INSPECTION CHART FOR TROUBLE SYMPTOMS
Trouble symptomInspection
procedure No.Reference
page
Communication between MUT-IIand the whole system is not possible.1Refer to
GROUP22
Communication between MUT-IIand 4WD-ECU is not possible.2
GROUP22.
3 ACD mode indicator lamps do not light up when the ignition key is turned to “ON”
(engine stationary).3
3 ACD mode indicator lamps remain lit up after the engine has started.4
AYC is inoperative.
Unable to start or accelerate on slippery road surfaces.527B-14
Rear tires are noisy during low-speed cornering.
Vehicle skews.627B-15
Noise is produced from the torque transfer differential during turning.727B-15
INSPECTION PROCEDURE FOR TROUBLE SYMPTOMS
INSPECTION PROCEDURE 5
AYC is inoperative.
Unable to start or accelerate on slippery road surfaces.
Probable cause
The hydraulic oil level is probably low, there is an oil leak, the hydraulic unit is defective,
or the torque transfer differential is defective.DLow hydraulic oil level
DOil leak
DDefective hydraulic unit
DDefective torque transfer differential
NOTE
This symptom is limited only when the diagnosis code is correct.
NG
Replace the hydraulic unit. (Refer to
P.27B-61.)
NG
Add fluid. (Refer to P.27B-19.)
OKRepair
Check the trouble symptom.NO
Replace the torque transfer differential.
OK
Is foreign matter trapped in the hydrau-
lic line?YES
Repair
OK
Check the fluid level.
(Refer to P.27B-19.)Check the hydraulic pressure line for
leak.
OK
Add gear oil. (Refer to P.27B-16.)
OK
Check hydraulic pressure.
(Refer to P.27-21.)NGBleed the system of air.
(Refer to P.27-19.)
Check the gear oil level. (Refer to
P.27B-16.)NGCheck for oil leak.NG
Repair
Check the AYC for operation.
(Refer to P.27B-20.)Check the trouble symptom. OKOK
NGNormal
NGNG

REAR AXLE -Troubleshooting 27B-15
INSPECTION PROCEDURE 6
Rear tires are noisy during low-speed cornering.
Vehicle skews.
Probable cause
The hydraulic unit or torque transfer differential is probably defective.DDefective hydraulic unit
DDefective torque transfer differential
NOTE
This symptom is limited only when the diagnosis code is correct.
NG
Replace the hydraulic unit. (Refer to
P.27B-61.)
NG
Add fluid. (Refer to P.27B-19.)
OKRepair
Check the trouble symptom.NO
Replace the torque transfer differential.
OK
Is foreign matter trapped in the hydrau-
lic line?YES
Repair
Check the fluid level.
(Refer to P.27B-19.)Check the hydraulic pressure line for
leak.
OK
Check hydraulic pressure.
(Refer to P.27-21.)NGBleed the system of air.
(Refer to P.27-19.)
Check the AYC for operation.
(Refer to P.27B-20.)Check the trouble symptom. OK
NG
NGNG
INSPECTION PROCEDURE 7
Noise is produced from the torque transfer differential
during turning
Probable cause
The torque transfer differential is probably defective.DDefective torque transfer differential
NOTE
This symptom is limited only when the diagnosis code is correct.
NG
Replace the gear oil of the torque transfer differential. (Refer to
P.27B-17.)
Replace the gear oil of the torque transfer differential. (Refer to
P.27B-17.)Normal
Replace the gear oil of the torque transfer differential. (Refer to
P.27B-17.)
Replace the torque transfer differential.
Check the trouble symptom.
OKNG
NG
MUT-IIActuator test
DNo. 06 Clutch operation check (left side) 5 times
DNo. 07 Clutch operation check (right side) 5 times
DSteering wheel on neutral position
DDrive straight in 20 km/h or less
MUT-IIActuator test
DNo. 06 Clutch operation check (left side) 5 times
DNo. 07 Clutch operation check (right side) 5 times
DSteering wheel on neutral position
DDrive straight in 20 km/h or less
Check the trouble symptom.
Normal

REAR AXLE -On-vehicle Service27B-16
DATA LIST REFERENCE TABLE
For check, refer to GROUP 22.
ACTUATOR TEST REFERENCE TABLE
For check, refer to GROUP 22.
CHECK AT 4WD-ECU TERMINALS
For check, refer to GROUP 22.
ON-VEHICLE SERVICE
REAR AXLE TOTAL BACKLASH CHECK
1. Park the vehicle on a flat, level surface.
2. Move the transmission control lever to the neutral position.
Apply the parking brake. Raise the vehicle on a jack.
3. Turn the companion flange clockwise as far as it will go.
Make the mating mark on the dust cover of the companion
flange and on the differential carrier.
4. Turn the companion flange anti-clockwise as far as it
will go, and measure the amount of distance the mating
marks moved.
Limit: 6 mm
5. If the backlash exceeds the limit value, replace the
differential carrier assembly.
GEAR OIL LEVEL CHECK

1. Remove the filler plug.
2. Check that the gear oil level is within the specified range
from the bottom end of the filler plug hole.
3. If the gear oil level exceeds the standard value, add the
specified gear oil up to the bottom end of the filler plug
hole.
Specified gear oil:
Hypoid gear oil
MITSUBISHI Genuine Gear Oil Part No. 8149630
EX, CASTROL HYPOY LS (GL-5, SAE 90),
SHELL-LSD (GL-5, SAE 80W - 90) or equivalent
4. Fit the filler plug and tighten it to the specified torque.
Tightening torque: 49±9 N·m
Mating marks
Upper
limit
Lower
limit
Gear oil
8mm

REAR AXLE -On-vehicle Service27B-17

Differential part
1. Remove the filler plug.
2. Check that the gear oil level is within the specified range
from the bottom end of the filler plug hole.
3. If the gear oil level exceeds the standard value, add the
specified gear oil up to the bottom end of the filler plug
hole.
Specified gear oil:
Hypoid gear oil API classification GL-5 or higher
SAE viscosity Number 90, 80W
NOTE
10_C or more: SAE90, less than 10_C: SAE80W
4. Fit the filler plug and tighten it to the specified torque.
Tightening torque: 49±9 N·m
Torque transfer mechanism part
1. Remove the filler plug.
2. Check that the gear oil level is within the specified range
from the bottom end of the filler plug hole.
3. If the gear oil level exceeds the standard value, add the
specified gear oil up to the bottom end of the filler plug
hole.
Specified gear oil: ATF-SP III
4. Fit the filler plug and tighten it to the specified torque.
Tightening torque: 49±9 N·m
GEAR OIL CHANGE

1. Remove the drain plug to discharge the gear oil.
2. Fit the drain plug and tighten it to the specified torque.
Tightening torque: 49±9 N·m
3. Remove the filler plug and add the specified gear oil
up to the bottom end of the filler plug hole.
Filler plug
Upper limit
Lower limitGear oil
6mm
Filler plug
Upper limit
Lower limitGear oil
6mm

REAR AXLE -On-vehicle ServiceREAR AXLE -On-vehicle Service27B-18
Specified gear oil:
Hypoid gear oil
MITSUBISHI Genuine Gear Oil Part No. 8149630
EX, CASTROL HYPOY LS (GL-5, SAE 90),
SHELL-LSD (GL-5, SAE 80W - 90) or equivalent
Quantity: 0.55 L
4. Fit the filler plug and tighten it to the specified torque.
Tightening torque: 49±9 N·m

Differential part
1. Remove the drain plug to discharge the gear oil.
2. Fit the drain plug and tighten it to the specified torque.
Tightening torque: 49±9 N·m
3. Remove the filler plug and add the specified gear oil
up to the bottom end of the filler plug hole.
Specified gear oil:
Hypoid gear oil API classification GL-5 or higher
SAE viscosity Number 90, 80W
Quantity: 0.55±0.02 L
NOTE
10_C or more: SAE90, less than 10_C: SAE80W
4. Fit the filler plug and tighten it to the specified torque.
Tightening torque: 49±9 N·m
Torque transfer mechanism part
1. Remove the drain plug to discharge the gear oil.
2. Fit the drain plug and tighten it to the specified torque.
Tightening torque: 49±9 N·m
3. Remove the filler plug.
4. Using the oil suction gun (general service tool), between
the body and differential support arm, apply the specified
gear oil up to the under of the filler plug hall.
Specified gear oil: ATF-SP III
Quantity: 0.65 - 0.7 L
5. Fit the filler plug and tighten it to the specified torque.
Tightening torque: 49±9 N·m
Gear oil
Filler plug
Drain plug
Upper limit
Lower limitGear oil
6mm
Filler plug
Drain plug
Oil suction gun
(general service tool)

REAR AXLE -On-vehicle Service27B-19
FLUID LEVEL CHECK
1. Remove the maintenance lid located in the luggage
compartment.
2.
If the vehicle has been run, leave it for 90 min. or more
in an ordinary temperature (10_C–30_C) to allow the
accumulator internal pressure to drop.
NOTE
If the ambient temperature is 10_C or less, allow more
time to leave the vehicle to stand idle.

Set MUT-IIto 16 pin diagnostic connector. Turn the ignition
switch to the ON position, operate MUT-II, drive the
hydraulic unit (item No.03) forcibly, release the pressure in
the accumulator.
Caution
Turn the ignition switch to the LOCK (OFF) position
before connecting or disconnecting the MUT-II.
NOTE
(1) To drive (oil level check mode) forcibly, turn the
directional valve of the hydraulic unit 20 turns from
side to side, release the differential automatically.
Drive can also be cleared forcibly using the Clear
key of MUT-II.
(2) If the function has been stopped by fail safe, the
hydraulic unit can not be cleared forcibly.
3. Check that the fluid level in the oil reservoir is in the
range between MAX and MIN.
4. If the fluid level is lower than MIN, add the specified
fluid.
Specified fluid: ATF-SP III
5. Reinstall the maintenance lid.
BLEEDING
1. Lift up the vehicle.
2. Set the MUT-IIto the 16-pin diagnosis connector.
Caution
Turn the ignition switch to the LOCK (OFF) position
before connecting or disconnecting the MUT-II.
3. Turn the ignition switch to the ON position.
4. Set the steering wheel in the straight-ahead position.
5. Operating the MUT-II, drive the hydraulic unit (item No.02)
forcibly.
NOTE
(1) Drive the bleeding mode forcibly for 5 minutes, release
the operation automatically. Drive can also be cleared
forcibly using the Clear key of MUT-II.
(2) If the function has been stopped by fail safe, the
hydraulic unit cannot be cleared forcibly.

REAR AXLE -On-vehicle Service27B-20
6. Remove the cap of the left bleeder screw on the torque
transfer differential and connect a vinyl hose.
7. Gradually turn the steering wheel clockwise from the
straight-ahead position. At this time, loosen the left bleeder
screw and check that fluid is discharged with air.
8. After air has been completely discharged, tighten bleeder
screw and turn the steering wheel in the straight-ahead
position.
Caution
While the system is being bled of air, add fluid as
necessary to ensure that it is left in the oil reservoir
during the entire procedure.
9. Repeat steps 6 and 7 two to three times until no air
bubbles are recognized in the fluid that comes out. Then,
tighten the bleeder screw to the specified torque.
Tightening torque: 9±1 N·m
10. Perform steps 5 through 8 for the right bleeder screw.
Note, however, that the steering wheel should be turned
conterclockwise.
11. When removing the hydraulic unit, bleed the fluid line
in ACD side. (Refer to GROUP 22 – On-vehicle Service.)
12. After the system has been completely bled of air, check
for the fluid level. (Refer to P. 27B-19.)
Caution
If the system is not completely bled of air, the hydraulic
unit could generate noise, degrading pump durability.
AYC OPERATION CHECK
1. Lift up the vehicles.
2. Set the MUT-IIto the 16-pin diagnosis connector.
Caution
Turn the ignition switch to the LOCK (OFF) position
before connecting or disconnecting the MUT-II.
3. Start the engine.
4. Set the gear to the 2nd gear or above, operate MUT-II,
and check from the service data (Item No.09) that the
wheel speed is within 10 km/h to 20 km/h.
NOTE
(1) Set the steering wheel to the neutral position.
(2) When turning the steering wheel, AYC operates
continually (operation sound from the torque transfer
differential), but it is not system fault. In this case,
set the steering wheel to the neutral position, and
perform the following operations in order to stop the
ACD.
DRelease the clutch.
DSet the gear to ”Neutral”.
DStop the engine.
Bleeder
screw
Vinyl hose