Mitsubishi Evolution X. Manual — part 812
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DIAGNOSIS
TSB Revision
ACTIVE SKID CONTROL SYSTEM (ASC)
35C-255
DATA LIST REFERENCE TABLE
M1355001500216
The following items of ECU input data can be read
using the scan tool.
1. The system is normal.
Item No.
Check item
Check conditions
Normal conditions
01
FL wheel speed sensor
Perform a test run of the vehicle. The speedometer display and
scan tool display almost agree
with each other. <Vehicle
stopped: Approximately 0.7
km/h (1.1 mph)>
02
FR wheel speed sensor
03
RL wheel speed sensor
04
RR wheel speed sensor
05
Power supply voltage
System voltage (10 to 18 V
ASC operable range)
07
Brake switch (input)
The brake pedal is depressed.
ON
The brake pedal is released.
OFF
08
Lateral G sensor (+: left
turn, -: right turn)
Vehicle stopped (level)
-0.11 to 0.11 G
Running
-1 to 1 G
09
G sensor (+: deceleration,
-: acceleration)
Vehicle stopped (level)
-0.11 to 0.11 G
Running
-1 to 1 G
10
Master cylinder pressure
The brake pedal is depressed.
Increases by the amount of
the brake pedal depression.
The brake pedal is released.
-3 to 3 bar
11
Steering angle (+: left turn,
-: right turn)
Vehicle stopped (Steering wheel
in neutral position)
-6 to 6 deg
Running
Nearly the same as the
steering wheel operation angle
<-720 to 720 deg (ASC-ECU
normal detection value)>
When removed from vehicle
(Steering wheel sensor as a
single unit)
Nearly the same as the
steering wheel operation angle
<-850 to 850 deg (Sensor
normal value as a single unit)>
12
Yaw rate sensor (+: left
turn, -: right turn)
Vehicle stopped (level)
-3.6 to 3.6 deg/s
Running
-100 to 100 deg/s
14
Brake switch
The brake pedal is depressed.
ON
The brake pedal is released.
OFF
15
Emission test mode
Emission test mode: ON
ON
Emission test mode: OFF
OFF
26
Brake fluid pressure
switch
Brake fluid level is lower than the
"LOWER" marking.
Low
Brake fluid level is higher than
the "LOWER" marking.
Normal
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DIAGNOSIS
TSB Revision
ACTIVE SKID CONTROL SYSTEM (ASC)
35C-256
28
ASC/TCL off switch
ASC OFF switch not operated
(ASC control is available)
ON
When ASC OFF switch is
operated (pressed shortly) (ASC
control is prohibited)
OFF
When ASC OFF switch is
operated (pressed and held for
15 seconds or more) (ASC OFF
control is prohibited by fail-safe.)
ON
45
SAS OK flag
When the learning is completed
Comp
When the learning is not
completed
Not Comp
When the steering wheel sensor
is faulty
SAS fail
SAS fail&Not Comp
65
Engine Speed
When the accelerator pedal is
depressed (engine started)
The tachometer display and
the scan tool display almost
agree with each other.
66
Engine torque
Displays the engine torque.
67
APS sensor
Displays the accelerator pedal
opening angle.
68
Allow ESP torque request Engine torque intervention is
permitted
Allow
70
Target gear
The shift lever is operated
Displays the shift lever
position.
71
Actual gear
72
Master cylinder pressure
Offset
Master cylinder pressure sensor
correction amount at the master
cylinder pressure sensor
calibration
-8 to 8 bar
73
Lateral G sensor offset
Lateral G sensor correction
amount at G and yaw rate sensor
calibration
-0.17 to 0.17 G
86
Ignition switch
Ignition switch is "ON" position
ON
87
Ignition switch (input)
Ignition switch is "ON" position
ON
Ignition switch is "START"
position
START
88
Vehicle speed
Perform a test run of the vehicle. The speedometer display and
scan tool display almost agree
with each other.
91
Brake pressure sensor
The brake pedal is depressed.
Pressed
The brake pedal is released.
Not pressed
96
G sensor offset
Longitudinal G sensor correction
amount at G and yaw rate sensor
calibration
-0.3 to 0.3 G
97
Yaw rate sensor offset
Yaw rate sensor correction
amount at G and yaw rate sensor
calibration
-6.0 to 6.0 deg/s
Item No.
Check item
Check conditions
Normal conditions
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DIAGNOSIS
TSB Revision
ACTIVE SKID CONTROL SYSTEM (ASC)
35C-257
2. System shutdown by ECU
While ASC-ECU is disabled by the diagnostic
function, the scan tool displayed data is different
from the actual measurement.
ACTUATOR TEST REFERENCE TABLE
M1355001600172
Using scan tool, the following actuators can be forc-
ibly operated:
NOTE:
.
•
ABS, TCL, and skid control are operated by
ASC-ECU.
•
When ASC-ECU is disabled due to the fail-safe
function, the actuator test cannot be performed.
•
The actuator test can be performed only when
the vehicle is stationary.
•
While the actuator test is performed, the ABS
warning light flashes at a rate of 2 Hz.
•
After the actuator test has been performed, the
brake warning light, ABS warning light, ASC ON
indicator light, and ASC OFF indicator light illumi-
nate until the ignition switch is turned to ON again
or the communication between scan tool and
ASC-ECU is terminated.
.
105
Power supply voltage (input)
System voltage (10 to 18 V
ASC operable range)
120
Parking brake switch
(input)
When the parking brake lever is
pulled up.
ON
When the parking brake lever is
released.
OFF
128
ASC/TCL off switch
When the ASC OFF switch is
pressed.
ON
When the ASC OFF switch is not
pressed.
OFF
129
FL wheel cylinder
pressure
The brake pedal is depressed.
Increases by the amount of
the brake pedal depression.
The brake pedal is released.
-3 to 3 bar
130
FR wheel cylinder
pressure
The brake pedal is depressed.
Increases by the amount of
the brake pedal depression.
The brake pedal is released.
-3 to 3 bar
131
RL wheel cylinder
pressure
The brake pedal is depressed.
Increases by the amount of
the brake pedal depression.
The brake pedal is released.
-3 to 3 bar
132
RR wheel cylinder
pressure
The brake pedal is depressed.
Increases by the amount of
the brake pedal depression.
The brake pedal is released.
-3 to 3 bar
133
FL wheel cylinder pres.
offset
Wheel cylinder fluid pressure
sensor correction amount
-8 to 8 bar
134
FR wheel cylinder pres.
offset
135
RL wheel cylinder pres.
offset
136
RR wheel cylinder pres.
offset
Item No.
Check item
Check conditions
Normal conditions
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DIAGNOSIS
TSB Revision
ACTIVE SKID CONTROL SYSTEM (ASC)
35C-258
Actuator test specifications
.
Operation pattern of items 01 to 08
Item No.
Check item
Driven component
01
FL wheel ABS drive
Solenoid valve for the corresponding
channel of the hydraulic unit and pump
motor (simplified inspection mode)
02
FR wheel ABS drive
03
RL wheel ABS drive
04
RR wheel ABS drive
05
FL wheel TCL drive
06
FR wheel TCL drive
07
RL wheel TCL drive
08
RR wheel TCL drive
09
Engine TCL drive
Outputs the engine torque control signal
(engine torque = 0 N
⋅ m) to the engine
ECU for three seconds.
AC400776
1seconds
2 seconds
Approx. 0.05
seconds
Approx. 0.01
seconds
AB
End
Scan tool actuator test
(Item No.05, 06, 07, 08) start
End
Increase in pressure
Steady pressure
Reduction in pressure
Increase in pressure
Steady pressure
Reduction in pressure
Drive
Stop
Cut valve,
Suction valve
(TCL/Skid control)
Solenoid valve
(ABS)
Pump motor
Scan tool actuator test
(Item No.01, 02, 03, 04) start
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