Mitsubishi Lancer Evolution 7. Manual — part 255
MANUAL TRANSMISSION - On-vehicle Service
22A-43
4. Set the gear to the 2nd gear or above, operate the 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) The ACD may continue operating (operation sounds
can be heard) when the steering wheel is steered,
this is not a system fault. In this case, set the steering
wheel to the neutral position, and perform the following
operations to stop the ACD.
D
Release the clutch.
D
Set the gear to “N”.
D
Stop the engine
5. Perform the MUT-II actuator test (Item No.05), and forcibly
drive the transfer.
NOTE
(1) The actuator test (Item No. 05: ACD Operation Check
Mode) is performed for 1 minute, after which it will
be cleared automatically. Drive can also be cleared
during forced driving using the clear key of the MUT-II.
(2) If the hydraulic unit function has been stopped by
fail-safe, the transfer cannot be forcibly driven.
6. Check that the front and rear wheel speeds satisfy the
following in the MUT-II actuator test (Item No.05).
<Actuator test: While executing Item No. 05>
The front wheel will be faster than the back wheels by
more than 2 km/h.
NOTE
If the above are not satisfied, check the oil pressure as
the system may be faulty.
HYDRAULIC PRESSURE CHECK <VEHICLES
WITH ACD OR VEHICLES WITH ACD AND AYC>
1. Lift up the vehicle.
2. Set the MUT-II to the 16-pin diagnosis connector.
Caution
Turn the ignition switch to the “LOCK”(OFF) position
before connecting or disconnecting the MUT-II.
3. Disconnect the hydraulic unit and transfer connector
assembly, and connect the special tool to the hydraulic
unit.
4. Turn the ignition switch to “ON”.
5. Perform the MUT-II actuator test (Item No.05), and forcibly
drive the hydraulic unit.
NOTE
(1) The actuator test (Item No. 05 ACD Operation Check
Mode) is performed for 1 minute, after which it will
be cleared automatically. Drive can also be cleared
during forced driving using the clear key of the MUT-II.
MD998330
MB991705
MANUAL TRANSMISSION - On-vehicle Service
22A-44
(2) If the hydraulic unit function has been stopped by
fail-safe, the hydraulic unit cannot be forcibly driven.
6. Check that the generated oil pressure of the hydraulic
unit satisfies the standard value.
Standard value: 1.0 – 1.6 MPa
Caution
While the oil pressure is checked, add fluid as
necessary to ensure that it is left in the oil reservoir
during the entire procedure.
7. If the measured value exceeds the standard value, replace
the hydraulic unit.
8. Connect the hydraulic unit and transfer connector
assembly, and tighten the flare nut at the specified torque.
Tightening torque: 34 ± 5 N·m (when screw is dry)
26 ± 4 N·m (when screw is applied with oil)
9. Supply the specified fluid up to the MAX level of the
oil reservoir, and bleed the oil pressure pipes.
Specified fluid: DIA QUEEN ATF SP III
Quantity:
0.9 dm
3
<Pipes between ACD and hydraulic unit>
1.0 dm
3
<Pipes between ACD and hydraulic unit>
WHEEL SPEED SENSOR OUTPUT VOLTAGE
MEASUREMENT <VEHICLES WITH ACD
(VEHICLES WITHOUT AYC)>
1. Lift the vehicle, and release the parking brake.
2. Disconnect the 4WD-ECU connector, and measure at
the connector of the harness.
Caution
Insert the probe from the harness of the connector.
Inserting in the terminal side may cause contact fault.
3. Rotate the measured wheel by about 1/2 to 1
rotations/second, and check the output voltage between
the following terminals using a circuit tester (AC mV range)
or oscilloscope.
Terminal No.
Front left
Front right
Rear left
Rear right
6
9
8
7
19
22
21
20
MANUAL TRANSMISSION - On-vehicle Service
22A-45
Output voltage:
Above 70 mV when measured with the circuit
tester
Above 200 mVP-P when measured with the
oscilloscope
4. If the output voltage is lower than the above values, the
following reasons may be suspected. Check or replace
the wheel speed sensor.
D
Excessive clearance between the ball piece of the
wheel speed sensor and ABS rotor
D
Wheel speed sensor faul
INSPECTION PROCEDURE USING OSCILLOSCOPE
After checking the connected state of the harness of the
wheel speed sensor and connector, and measure the output
voltage waveform of each wheel speed sensor on the
oscilloscope as follows.
Start the engine, shift the transmission to the 1st gear to
rotate the driving wheel, and rotate the non-driving wheel
at constant velocity with the hand.
NOTE
1. It is also possible to actually drive the vehicle and observe
the waveform.
2. The output voltage is low if the wheel speed is low and
gradually increases as the speed increases.
<Waveform observation points>
Phenomenon
Probable cause
Solution
Waveform amplitude is too small or
not output at all
Wheel seed sensor fault
Replace the sensor
Excessive waveform amplitude
(However allowed if above the
i i
lit d
f 100 V)
Excessive vibration or concentricity of
the axle hub
Replace the hub
(
minimum amplitude of 100 mV)
4WD-ECU earth fault
Correct
Noise in the waveform or waveform
i
b
l
Open circuit of the sensor
Replace the sensor
is abnormal
Open circuit of the harness
Replace the harness
Wheel speed sensor installation fault
Correct the installation of the sensor
Chipping or flattening of the ABS rotor
Replace the ABS rotor
Caution
As the wheel speed sensor cable follows the movement of the front or rear suspension, it will
change considerably on poor condition roads. Therefore, also observe the output voltage waveform
of the wheel speed sensor with the sensor harness vibrated to simulate special conditions such
as driving in poor road conditions.
When rotated with the hand
When idling (5 – 6 km/h)
1st gear
10.0 ms/DIV
IV/DIV
MANUAL TRANSMISSION - Transmission Control
22A-46
TRANSMISSION CONTROL
REMOVAL AND INSTALLATION
Pre-removal Operation
D
Strut Tower Bar Removal and Installation (Refer
to GROUP 42.)
D
Air Cleaner Removal (Refer to GROUP 15.)
D
Battery and Battery Tray Removal
D
Air Pipe C, Air By-pass Hose, Air Hose D, Air Hose
E, and Air Hose A Removal (Refer to GROUP 15
- Intercooler.)
Caution: SRS
Be careful not to subject the SRS-ECU to any
shocks during removal and installation of the
shift cable and select cable assembly.
12
±
2 N·m
3
4
2
1
5
6
7
8
6
9
10
12
±
2 N·m
11
Shift cable and select cable
assembly removal steps
1. Shift knob
D
Front floor console
(Refer to GROUP 52A)
2. Snap pin
3. Select cable connection
(Shift lever side)
4. Clip
5. Shift cable connection
(Shift lever side)
6. Snap pin
A
A" "AA 7. Clip
A
A" "AA 8. Select cable connection
(Transmission side)
A
A" "AA 9. Shift cable connection
(Transmission side)
"
AA 10. Shift cable and Select cable assem-
bly
Shift lever assembly removal steps
1. Shift knob
D
Front floor console
(Refer to GROUP 52A)
2. Snap pin
3. Select cable connection
(Shift lever side)
4. Clip
5. Shift cable connection
(Shift lever side)
11. Shift lever assembly
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