Mitsubishi Lancer Evolution 7. Manual — part 282
REAR AXLE -
Troubleshooting <AYC>
27B-13
Code No. 73 Directional control valve (left) system
Probable cause
This code is output when the directional control valve (left) control circuit is open-
or short-circuited.
D
Defective directional control valve (left)
D
Defective harness or connector
D
Defective 4WD-ECU
<Vehicles with ACD + AYC>
NG
Check and repair the harness between
directional control valve (left) and body
earth.
OK
Check the trouble symptom.
OK
Replace 4WD-ECU.
NG
Checktheharnessbetweendirectional
control valve (left) and 4WD-ECU.
NG
Repair
OK
Check the trouble symptom.
OK
Check the following connectors:
C-44, C-130*, C-134, F-24, F-25
NG
Repair
OK
Measure at directional control valve
(left) connector F-25.
D
Disconnect the connector and
measure at the directional control
valve side.
D
Resistance between 1 and body
earth
OK: 2 Ω or less
NG
Check the following connectors:
F-25, F-24
NG
Repair
Measure at directional control valve
(left) connector F-25.
D
Disconnect the connector and
measure at the directional control
valve side.
D
Resistance between 1 and 2
OK: 19 - 21 Ω or less
NG
Replace the hydraulic unit. (Refer to
P27B-61.)
*: L.H. drive vehicles
<Vehicles with ACD>
OK
Check and repair the harness between
4WD-ECU and body earth.
Measure at 4WD-ECU connector
C-43.
D
Disconnect the connector and
measure at the harness side.
D
Resistance between 50 and body
earth
OK: 2 Ω or less
NG
Check the following connector:
C-43
NG
Repair
OK
Replace 4WD-ECU.
OK
Check the following connector:
C-43
NG
Repair
NG
Repair
REAR AXLE -
Troubleshooting <AYC>
REAR AXLE -
Troubleshooting <AYC>
27B-14
INSPECTION CHART FOR TROUBLE SYMPTOMS
Trouble symptom
Inspection
procedure No.
Reference
page
Communication between MUT-II and the whole system is not possible.
1
Refer to
GROUP 22
Communication between MUT-II and 4WD-ECU is not possible.
2
GROUP 22.
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.
5
27B-14
Rear tires are noisy during low-speed cornering.
Vehicle skews.
6
27B-15
Noise is produced from the torque transfer differential during turning.
7
27B-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.
D
Low hydraulic oil level
D
Oil leak
D
Defective hydraulic unit
D
Defective 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.)
OK
Repair
Check the trouble symptom.
NO
Replacethetorquetransferdifferential.
OK
Is foreign matter trappedin thehydrau-
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.)
NG
Bleed the system of air.
(Refer to P.27-19.)
Check the gear oil level. (Refer to
P.27B-16.)
NG
Check for oil leak.
NG
Repair
Check the AYC for operation.
(Refer to P.27B-20.)
Check the trouble symptom.
OK
OK
NG
Normal
NG
NG
REAR AXLE -
Troubleshooting <AYC>
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.
D
Defective hydraulic unit
D
Defective 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.)
OK
Repair
Check the trouble symptom.
NO
Replacethetorquetransferdifferential.
OK
Is foreign matter trappedin thehydrau-
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.)
NG
Bleed 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
NG
NG
INSPECTION PROCEDURE 7
Noise is produced from the torque transfer differential
during turning
Probable cause
The torque transfer differential is probably defective.
D
Defective 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.
OK
NG
NG
MUT-II Actuator test
D
No. 06 Clutch operation check (left side) 5 times
D
No. 07 Clutch operation check (right side) 5 times
D
Steering wheel on neutral position
D
Drive straight in 20 km/h or less
MUT-II Actuator test
D
No. 06 Clutch operation check (left side) 5 times
D
No. 07 Clutch operation check (right side) 5 times
D
Steering wheel on neutral position
D
Drive straight in 20 km/h or less
Check the trouble symptom.
Normal
REAR AXLE -
On-vehicle Service
27B-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
<Vehicles with mechanical LSD>
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
8 mm
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