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