Mitsubishi Lancer Evolution IX. Manual — part 312
TROUBLESHOOTING
REAR AXLE
27-23
STEP 7. Check the harness between direction
valve (LH) connector F-22 terminal No.2 and
4WD-ECU connector C-25 terminal No.15.
AC310739
1 2
Connector: F-22
F-22 (2-B)
AB
Hydraulic unit
assembly
AC310721
18
16
1415
17
23
21
1920
22
26
2425
3
1 2
4 5
10
8
6 7
9
13
12
11
4WD-ECU
C-25 (26-Y)
Connector: C-25
AB
Check the output line for short-circuited or open cir-
cuit.
Q: Is the check result normal?
YES :
Replace the 4WD-ECU.
NO :
Repair the wiring harness.
SYMPTOM CHART
M1272004200027
Trouble symptom
Inspection
procedure No.
Reference page
Communication with the M.U.T.-II/III is not possible
1
Refer to GROUP
22A,
Troubleshooting
−S
ymptom chart
Communication between the M.U.T.-II/III and 4WD-ECU is not
possible
2
Three ACD mode indicator lamps do not light up when the
ignition key is turned to "ON" position (engine stopped).
3
Three ACD mode indicator lamps remain lit up after the engine
has started.
4
AYC is inoperative.
Unable to start or accelerate on slippery road surface.
5
Rear tyres are noisy during low-speed cornering.
Vehicle skews.
6
Noise is produced from the torque transfer differential during
turning.
7
TROUBLESHOOTING
REAR AXLE
27-24
INSPECTION PROCEDURE FOR
TROUBLE SYMPTOMS
INSPECTION PROCEDURE 5: AYC is inoperative. Unable to start or accelerate on slippery road
surfaces.
COMMENTS ON TROUBLE SYMPTOM
The hydraulic oil level is probably low, there is an oil
leak, the hydraulic unit is defective, or the torque
transfer differential is defective.
POSSIBLE CAUSES
• Low hydraulic oil level
• Oil leak
• Malfunction of the hydraulic unit
• Malfunction of the torque transfer differential
DIAGNOSIS
STEP 1.Gear oil level check
Check the gear oil level of AYC differential part and
torque transfer mechanism part (Refer to
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
After checking for oil leakage, repair it and
refill the gear oil (Refer to
STEP 2. Fluid level check
Check the fluid level (Refer to
).
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
After checking the hydraulic pressure line
for fluid leakage, repair it and refill the fluid
(Refer to
STEP 3. AYC operation check
Check the AYC operation (Refer to
Q: Does a malfunction take place again?
YES :
Go to Step 4.
NO :
The procedure is complete.
STEP 4. Oil pump pressure test
Measure the oil pump pressure of the hydraulic unit.
(Refer to
).
Q: Is the check result normal?
YES :
Go to Step 6.
NO :
Go to Step 5.
STEP 5. AYC bleeding
Bleed the AYC system (Refer to
).
Q: Does a malfunction take place again?
YES :
Replace the hydraulic unit (Refer to
).
NO :
Go to Step 6.
STEP 6. Hydraulic pressure line check
Check the hydraulic pressure line for entry of foreign
matter.
Q: Is there foreign matter trapped in the hydraulic
pressure line?
YES :
Remove the foreign matter in the hydraulic
pressure line.
NO :
Replace the torque transfer differential.
INSPECTION PROCEDURE 6: Rear tyres are noisy during low-speed cornering. Vehicle skews.
COMMENTS ON TROUBLE SYMPTOM
The hydraulic unit or the torque transfer differential is
probably defective.
POSSIBLE CAUSES
• Malfunction of the hydraulic unit
• Malfunction of the torque transfer differential
DIAGNOSIS
STEP 1. Fluid level check
Check the fluid level (Refer to
).
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
After checking the hydraulic pressure line
for fluid leakage, repair it and refill the fluid
(Refer to
).
TROUBLESHOOTING
REAR AXLE
27-25
STEP 2. AYC operation check
Check the AYC operation (Refer to
).
Q: Does a malfunction take place again?
YES :
Go to Step 3.
NO :
The procedure is complete.
STEP 3. Oil pump pressure test
Measure the oil pump pressure of the hydraulic unit.
(Refer to
).
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Go to Step 4.
STEP 4. AYC bleeding
Bleed the AYC system (Refer to
).
Q: Does a malfunction take place again?
YES :
Replace the hydraulic unit (Refer to
).
NO :
Go to Step 5.
STEP 5. Hydraulic pressure line check
Check the hydraulic pressure line for entry of foreign
matter.
Q: Is there foreign matter trapped in the hydraulic
pressure line?
YES :
Remove the foreign matter in the hydraulic
pressure line.
NO :
Replace the torque transfer differential.
INSPECTION PROCEDURE 7: Noise is produced from the torque transfer differential during turning
COMMENTS ON TROUBLE SYMPTOM
The torque transfer differential is probably defective.
POSSIBLE CAUSES
• Malfunction of the torque transfer differential
DIAGNOSIS
STEP 1. M.U.T.-II/III actuator test
(1) Replace the torque transfer gear oil (Refer to
(2) Set M.U.T.-II/III to actuator test mode, and drive
the vehicle in straight with the speed 20 km/h or
less and with the steering wheel on neutral
position.
(3) Test the following items for 5 times respectively.
• Item 06: Clutch operation (left)
• Item 07: Clutch operation (right)
OK: Noise is not produced.
Q: Is the check result normal?
YES :
The procedure is complete and replace the
torque transfer gear oil (Refer to
).
NO :
Go to Step 2.
STEP 2. M.U.T.-II/III actuator test
Test again the following items for 5 times respectively
with the same condition described in STEP 2.
• Item 06: Clutch operation (left)
• Item 07: Clutch operation (right)
OK: Noise is not produced.
Q: Is the check result normal?
YES :
The procedure is complete and replace the
torque transfer gear oil (Refer to
).
NO :
Replace the torque transfer differential.
DATA LIST REFERENCE TABLE
M1272004300024
Refer to GROUP 22A, Data list reference table
ACTUATOR TEST REFERENCE TABLE
M1272005200020
Refer to GROUP 22A, Actuator test reference table
CHECK AT 4WD-ECU TERMINAL
M1272004500028
Refer to GROUP 22A, Check at 4WD-ECU terminal
ON-VEHICLE SERVICE
REAR AXLE
27-26
ON-VEHICLE SERVICE
REAR AXLE TOTAL BACKLASH CHECK
M1271001200252
1. Park the vehicle on a flat, level surface.
2. Move the transmission gearshift lever to the
neutral position. Apply the parking brake and jack
up the vehicle.
ACX00962
Mating marks
AC
3. Turn the propeller shaft clockwise as far as it will
go. Make the mating marks on the companion
flange and on the differential carrier.
ACX00964 AC
4. Turn the propeller shaft counterclockwise as far
as it will go, and measure the amount of distance
between the mating marks.
Limit: 6 mm
5. If the backlash exceeds the limit value, replace
the differential carrier assembly.
GEAR OIL LEVEL CHECK
M1272001200330
DIFFERENTIAL PART
AC310749 AB
Filler plug
1. Remove the filler plug.
AC102739
Gear oil
Upper
limit
Lower
limit
6 mm
AF
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: DIA QUEEN LSD gear oil
4. Fit the filler plug and tighten it to the specified
torque.
Tightening torque: 49
± 10 N⋅m
TORQUE TRANSFER MECHANISM PART
AC310750 AB
Filler plug
1. Remove the filler plug.
AC102739
Gear oil
Upper
limit
Lower
limit
6 mm
AF
2. Check that the gear oil level is within the specified
range from the bottom end of the filler plug hole.
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