Mitsubishi Lancer Evolution IX. Manual - part 615

TROUBLESHOOTING <ACD>

MANUAL TRANSMISSION (FF)

22A-143

16

Steering operation 
angle

Ignition switch: ON

Steering wheel: Steer by 90 
degrees to the right

R90 deg

Steering wheel: Steer by 90 
degrees to the left

L90 deg

17

Steering angle 
velocity

Ignition switch: ON

Steering wheel: No steering 0 deg/s
Steering wheel: Steer

The display 
changes 
according to the 
revolution 
speed.

18

Pressure sensor

During electric pump motor operations

1.0 

− 1.6 MPa

19

Pressure sensor 
power supply

Ignition switch: ON

Approx.5 V

20

Valve power supply

Ignition switch: ON

System voltage

21

Steering wheel 
sensor voltage 
<ST-1>

Ignition switch: ON

Steering wheel: Turn

1 

− 2 V and 2.5 − 

4.5 V are 
displayed 
alternately.

22

Steering wheel 
sensor voltage 
<ST-2>

Ignition switch: ON

Steering wheel: Turn 

1 

− 2 V and 2.5 − 

4.5 V are 
displayed 
alternately.

23

Steering wheel 
sensor voltage 
<ST-N>

Ignition switch: ON

Steering wheel: Neutral

1 

− 2 V

Steering wheel: Turn

2.5 

− 4.5 V

51

Idle switch

Ignition switch: ON

Accelerator pedal: Full 
closed

ON

Accelerator pedal: Press

OFF

52

Steering wheel 
sensor <ST-N>

Ignition switch: ON

steering wheel: Neutral

ON

Steering wheel: Turn from 
the neutral position

OFF

53

Steering wheel 
sensor <ST-1>

Ignition switch: ON

Steering wheel: Turn slowly ON and OFF are 

displayed 
alternately.

54

Steering wheel 
sensor <ST-2>

Ignition switch: ON

Steering wheel: Turn slowly ON and OFF are 

displayed 
alternately

55

Steering wheel 
sensor learning 
<ST-N>

Perform actual driving

Steering wheel sensor 
neutral position learning 
executed

ON

Steering wheel sensor 
neutral position learning 
un-executed

OFF

56

Stop lamp switch

• Ignition switch: ON

• Engine: Stopped

Brake pedal: Depress

ON

Brake pedal: Release

OFF

Item 
No.

Check item

Check condition

Normal 
condition

TROUBLESHOOTING <ACD>

MANUAL TRANSMISSION (FF)

22A-144

57

Motor monitor

Electric pump motor is currently operating

ON

Electric pump motor is currently not operating

OFF

58

Oil pressure state

Electric pump motor is currently operating

LOW

Electric pump motor is currently not operating

HIGH

59

Directional valve 
<Right>

AYC clutch right side is currently operating

ON

AYC clutch right side is currently not operating

OFF

60

Directional valve 
<Left>

AYC clutch left side is currently operating

ON

AYC clutch left side is currently not operating

OFF

61

ABS monitor

ABS is currently operating

ON

ABS is currently not operating

OFF

62

Parking brake switch

• Ignition switch: ON

• Engine: Stopped

Parking brake lever: Pull

ON

Parking brake lever: 
Release

OFF

63

ACD mode switch

• Ignition switch: ON

• Engine: Stopped

ACD mode switch: Press

ON

ACD mode switch: Release OFF

Item 
No.

Check item

Check condition

Normal 
condition

TROUBLESHOOTING <ACD>

MANUAL TRANSMISSION (FF)

22A-145

ACTUATOR TEST JUDGEMENT VALUE

M1221011300017

1. The actuator test can be executed only when all 

the following conditions are satisfied.

• All wheel speed sensor inputs below 20 km/h.

• No system malfunction detected.

• Steering angle is within ±30 degrees from the 

neutral position.

2. When the actuator test corresponds to one of the 

following conditions, forced driving will be cleared.

• When any one of the wheel speed sensor input is 

detected to be above 20 km/h. (excluding Item 
No.08 "Control OFF").

• When system malfunction is detected. (excluding 

diagnostic code No.82, 84, and 85).

• When the forced drive time is exceeded.

• When the M.U.T.-II/III is removed.

• When the Clear key of the M.U.T.-II/III is oper-

ated.

Item 
No.

Check item

Test description

Normal state

01

Bleeding <ACD>

Input current to the proportional valve 
according to the steering angle, and 
operate the proportional valve for five 
minutes.

Make sure no air leaks from the 
bleeder screw on the transfer.

02

Bleeding <AYC>

Input current to the proportional valve 
according to the steering angle, and 
operate the directional valve for five 
minutes.

Make sure no air leaks from the 
bleeder screw on the torque transfer 
differential.

03

Check the oil 
volume

Operate the directional valve to the left 
and right for 20 seconds.

Check that the oil volume of the 
reservoir tank is appropriate.

04

Electric pump drive Operate the electric pump for 5 seconds. Operation sounds of the electric 

pump can be heard.

05

Check the 
operations of the 
ACD

Operate the proportional valve <ACD> 
and supply the maximum oil pressure to 
the multi plate clutch.

Generate the tight corner braking 
phenomenon.

06

Check clutch 
operations <Left>

Operate the direction valve and supply 
the maximum oil pressure to the left 
clutch.

When the wheels are lifted, speed 
difference will occur between the 
rear left and right wheels.

07

Check clutch 
operations <Right>

Operate the direction valve and supply 
the maximum oil pressure to the right 
clutch.

When the wheels are lifted, speed 
difference will occur between the 
rear left and right wheels.

08

Control OFF

Turn OFF the electric pump relay, and 
turn OFF the control of the ACD and 
AYC.

In actual driving, there is difference 
between control ON and OFF.

TROUBLESHOOTING <ACD>

MANUAL TRANSMISSION (FF)

22A-146

CHECK AT 4WD-ECU TERMINALS

M1221011400014

AC310529AB

C-26

C-25

Terminal 
No.

Check item

Check condition

Normal state

1

Proportional 
valve <ACD>

Operate the Proportional 
valve in the actuator test 
(Item No.01). <ACD>

While executing the 
actuator test

System voltage

After completing the 
actuator test

1 V or less

3

Proportional 
valve <AYC>

Operate the Proportional 
valve in the actuator test 
(Item No.02). <AYC>

While executing the 
actuator test

System voltage

After completing the 
actuator test

1 V or less

6

Wheel speed 
sensor <FL>

Vehicle is stopping

1 V or less

Moving forward slowly

0 

⇔ 5 V flushing

7

Wheel speed 
sensor <RR>

Vehicle is stopping

1 V or less

Moving forward slowly

0 

⇔ 5 V flushing

8

Wheel speed 
sensor <RL>

Vehicle is stopping

1 V or less

Moving forward slowly

0 

⇔ 5 V flushing

9

Wheel speed 
sensor <FR>

Vehicle is stopping

1 V or less

Moving forward slowly

0 

⇔ 5 V flushing

10

Pressure sensor 
earth

Any time

1 V or less

11

Lateral G-sensor Ignition switch: ON Vehicle horizontal state

2.4 

− 2.6 V

13

4WD-ECU 
power supply

Ignition switch: OFF

0 V

Ignition switch: ON

System voltage

14

Directional valve 
<Right>

Operate the directional 
valve <right> in the 
actuator test (Item No.07)

While executing the 
actuator test

System voltage

After completing the 
actuator test

1 V or less

15

Directional valve 
<Left>

Operate the directional 
valve <left> in the 
actuator test (Item No.06)

While executing the 
actuator test

System voltage

After completing the 
actuator test

1 V or less

16

Electric pump 
relay power 
supply

When the electric pump motor is not operating

0 V

While the electric pump motor is operating

System voltage

23

Longitudinal 
G-sensor

Ignition switch: ON Vehicle horizontal state

2.4 

− 2.6 V

26

ECU earth

Any time

1 V or less