Mitsubishi Lancer Evolution VI. Manual — part 58
REAR AXLE –
Troubleshooting <AYC>
27-26
Item No.
Normal value
Checking requirements
Check item
46
Steer sensor (ST-N)
Steering wheel position
Ignition switch: ON
Neutral position
ON
Ignition switch: ON
90 deg. turned
from neutral
position
OFF
47
Steer sensor (ST-1)
Steering wheel position: Turn slowly counterclock-
wise.
Ignition switch: ON
ON and OFF are
indicated alternate-
ly.
48
Steer sensor (ST-2)
Steering wheel position: Turn slowly clockwise.
Ignition switch: ON
ON and OFF are
indicated alternate-
ly.
50
Stop lamp switch
Accelerator pedal position
Ignition switch: ON
Depressed
ON
Ignition switch: ON
Released
OFF
56
Pressure switch
Forced activation No.13 or
No.14 is being executed.
Electric pump in
operation
Low
Electric pump
not in operation
High
59
ABS monitor
ABS monitor
ON
ABS not in operation
OFF
REAR AXLE –
Troubleshooting <AYC>
27-27
ACTUATOR TEST REFERENCE TABLE
The following items can be tested by driving the corresponding actuator forcibly using the MUT-
II
.
Item No.
Check item
Checking requirements
Normal value
10
Air bleeding
Supply current to proportioning
valve in accordance with steering
angle to operate directional valve.
No air is to be bled from the
bleeder plug on the torque transfer
differential.
11
Oil level check
Let the directional valve operate to
left and right 20 times.
To be checked by oil level in
reservoir tank.
12
Electric pump operation
Let the electric pump operate for 5
seconds.
Operation sounds of the electric
pump are to be heard.
13
Clutch operation (left)
Let the directional valve operate to
supply the maximum pressure to the
left clutch.
The operation conditions are to be
checked by the speed difference
between left and right rear wheels
with the wheels raised. For details,
refer to AYC Operation Check on
P.27-34.
14
Clutch operation (right)
Let the directional valve operate to
supply the maximum pressure to the
right clutch.
The operation conditions are to be
checked by the speed difference
between left and right rear wheels
with the wheels raised. For details,
refer to AYC Operation Check on
P.27-34.
15
Control OFF
Turn off the electric pump relay to
deactivate AYC control.
During the test run, some
differences are to be recognized in
running behaviors between when
the system is ON and when it is
OFF.
NOTE
(1) The actuator test is feasible only when the following requirements are all satisfied.
D
All of inputs from four wheel speed sensors show 20 km/h or lower.
D
No system failure is registered.
D
The steering angle is within
±
30 deg. from the neutral position.
(2) The actuator test comes to an end when either of the following conditions is met since the forced
actuation is canceled.
D
Either of inputs from four wheel sensors shows higher than 20 km/h (with exception of Item
No.15 “Control OFF”).
D
Some trouble with the system is registered.
D
Forced activation time expires.
D
MUT-
II
is removed.
D
The clear key of MUT-
II
is operated.
REAR AXLE –
Troubleshooting <AYC>
27-28
CHECK AT AYC-ECU TERMINALS
TERMINAL VOLTAGE LISTING
D
The voltage is to be measured across each terminal and ground terminal.
D
Fig. below shows the arrangement of the terminals.
Terminal
No.
Check item
Check requirement
Normally
1
Lateral acceleration sensor
Ignition switch: ON
2.4 – 2.6 V
(horizontal position)
2
Longitudinal acceleration
sensor ground
Lateral acceleration sensor
ground
At all times
0 V
3
Longitudinal acceleration
sensor
Ignition switch: ON
2.4 – 2.6 V
(horizontal position)
4
Steer sensor (ST-2)
Engine: Idle speed
Turn steering wheel slowly.
0 V
↔
approx. 3 V
flashing
5
Steer sensor (ST-1)
Engine: Idle speed
Turn steering wheel slowly.
0 V
↔
approx. 3 V
flashing
6*
1
FR wheel speed
Vehicle stationary
1 V or less
Forward vehicle slowly.
0 – 5 V
7*
1
FL wheel speed
Vehicle stationary
1 V or less
Forward vehicle slowly.
0 – 5 V
8*
1
RR wheel speed
Vehicle stationary
1 V or less
Forward vehicle slowly.
0 – 5 V
9*
1
FL wheel speed
Vehicle stationary
1 V or less
Forward vehicle slowly.
0 – 5 V
10
Diagnosis selection input
When MUT
-II
is connected
1 V or less
When MUT
-II
is disconnected
System voltage
11
Stop lamp switch
Ignition switch:
ON
Stop lamp switch: ON
System voltage
ON
Stop lamp switch: OFF
1 V or less
12*
1
ABS monitor
When ABS monitor is activated
System voltage
When ABS monitor is deactivated
1 V or less
REAR AXLE –
Troubleshooting <AYC>
27-29
Terminal
No.
Normally
Check requirement
Check item
17
Steer sensor (ST-N)
Engine:
Idle speed
Steering wheel: Neutral position
0.5 V or less
Idle speed
Steering wheel: Turned 90
_
from
neutral position
2.5 – 3.5 V
18
TPS
Ignition switch:
ON
Accelerator pedal: Fully closed
0.3 – 1.0 V
ON
Accelerator pedal: Fully open
4.5 – 5.0 V
23
Diagnosis data input/output
When MUT-
II
is connected
Serial communica-
tion with MUT-
II
When MUT-
II
is disconnected
1 V or less
24
Idle position switch
Ignition switch:
ON
Accelerator pedal: Fully closed
2 V or less
ON
Accelerator pedal: Fully open
4.5 – 5.0 V
25
Accumulator pressure
switch
Ignition switch:
ON
Accumulator internal pressure:
Low
2 V or less
Accumulator internal pressure:
High
System voltage
26
ECU ground
At all times
0 V
31
AYC-ECU power supply
Ignition switch: ON
System voltage
Ignition switch: OFF
0 V
35
AYC motor relay
Ignition switch:
ON
When motor is energized
System voltage
ON
When motor is deenergized
2 V or less
36
AYC warning lamp
Ignition switch:
ON
When lamp is OFF
System voltage
ON
When lamp is ON
2 V or less
37
Directional control valve
(right)
Ignition switch:
ON
Right clutch: ON
System voltage
(right)
ON
Right clutch: OFF
0 V
38
Proportioning valve
Ignition switch:
ON
AYC-ON
0 V to system volt-
age
AYC-OFF
0 V
39
ECU backup power supply
At all times
System voltage
45
Directional control valve
(left)
Ignition switch:
ON
Left clutch: ON
System voltage
(left)
ON
Left clutch: OFF
0 V
46
ECU ground
At all times
0 V
NOTE
*1: Indicates the vehicles with ABS.
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