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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.

Set the gear to “N”.

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).

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

<Pipes between ACD and hydraulic unit>

1.0 dm

<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

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

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

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.)

Air Cleaner Removal (Refer to GROUP 15.)

Battery and Battery Tray Removal

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.

2 N·m

Shift cable and select cable

assembly removal steps

1. Shift knob

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" "AA 7. Clip

A" "AA 8. Select cable connection

(Transmission side)

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

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

Content .. 253 254 255 256 ..