Mitsubishi Lancer (4A9 engine). Manual — part 38
SPECIAL TOOL
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-5
SPECIAL TOOL
M1355005800349
Tool
Number
Name
Use
MB991910
MB991826
MB991955
MB991911
MB991824
MB991827
MB991825
a
b
c
d
e
f
DO NOT USE
MB991955
a. MB991824
b. MB991827
c. MB991910
d. MB991911
e. MB991825
f. MB991826
M.U.T.-III sub-assembly
a. Vehicle
Communication
Interface (V.C.I.)
b. M.U.T.-III USB cable
c. M.U.T.-III main
harness A (Vehicles
with CAN
communication
system)
d. M.U.T.-III main
harness B (Vehicles
without CAN
communication
system)
e. M.U.T.-III
measurement adapter
f. M.U.T.-III trigger
harness
CAUTION
For vehicles with CAN
communication, use
M.U.T.-III main harness
A to send the simulated
vehicle speed. If you
connect M.U.T.-III main
harness B instead, CAN
communication does
not function correctly.
ASC check (Diagnosis
code display, data list
display and calibration by
M.U.T.-III)
MB991997
TROUBLESHOOTING
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-6
TROUBLESHOOTING
DIAGNOSIS TROUBLESHOOTING FLOW
M1355000900114
Refer to GROUP 00
− How to Use Troubleshooting/
Inspection Service Points .
PRECAUTIONS FOR DIAGNOSIS
M1355009500168
1. ASC controls brake pressure by the assistance of
ECU. The symptoms described in the chart below
may occur during the normal ASC operation, and
they do not indicate any sign of malfunction.
Symptoms
Description of symptoms
• When the ASC operates, the operating noise is generated
from the motor. (Squeak noise)
• Noise is generated from the brake pedal together with the
vibration. (Gride noise)
• When ABS operates, the system repeats the activation and
deactivation. At this time, the noise is generated from the
chassis components. (Clonk: Suspension, Squeaky: Tyres)
These noises are generated when the
system and brake pedal operate
normally, and they do not indicate any
sign of malfunction.
• A slight shock may be felt when depressing the brake pedal
lightly during the low speed driving.
• Small clicking noise may be heard from the engine
compartment.
This noise is generated when the system
operation check (startup check
performed at the vehicle speed which is a
few km/h higher than the predetermined
vehicle speed) is performed, and it does
not indicate malfunction.
2. On the snowy or gravelled roads, a vehicle with
ABS would have longer braking distance
compared to the one without ABS. Considering
this characteristics, advise the customer to drive
the vehicle safely at lower speed and not to put
too much confidence in the ABS system when
driving on the above-mentioned roads.
3. The diagnosis code detection condition depends
on each diagnosis code. When the trouble
symptoms are rechecked, conditions described in
the description for the diagnosis code procedures
should be met.
MB991997
ASC check harness
Voltage inspection at
ASC-ECU terminals
MB992006
MB992006
Extra fine probe
Continuity check and
voltage measurement at
wiring harness or
connector
MB991709
Wiring harness set
Output current measure
at the wheel speed
sensor
Tool
Number
Name
Use
TROUBLESHOOTING
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-7
ABS WARNING LAMP, ASC WARNING/
OPERATION LAMP AND BRAKE
WARNING LAMP CHECK
M1352012001208
Check that ABS and brake warning lamps, ASC
warning/operation lamp illuminate as follows.
NOTE: The brake warning lamp is used as a warning
lamp for parking brake, brake fluid level, and EBD
control.
AC700575AH
ABS warning lamp
ABS warning
lamp, Brake
warning lamp,
ASC warning/
operation lamp
Ignition switch
Illuminated
Approximately 3s
ON
ACC,
LOCK
START
Brake warning lamp
Not
illuminated
ASC warning/
operation lamp
1. When the ignition switch is turned to the ON
position, ABS and brake warning lamps, ASC
warning/operation lamp illuminate.
2. The ABS and brake warning lamps, ASC warning/
operation lamp illuminate for three seconds
*1
and
then turn OFF
*2
.
3. Otherwise, check the diagnosis code.
NOTE:
.
•
*1
: The ABS warning lamp may stay ON until the
vehicle speed reaches 10 km/h. As far as ABS-
ECU stores any diagnosis code related to the
wheel speed sensor malfunction or the motor
malfunction as past trouble, ABS-ECU continues
illuminating the ABS warning lamp until it verifies
that the malfunction for that code is resolved
(startup check).
•
*2
: The brake warning lamp does not turn OFF
when the parking brake is applied or the brake
fluid level is lowered.
DIAGNOSTIC FUNCTION
M1355001000846
ASC-ECU has the following functions for easier sys-
tem checks.
• Diagnosis code set (Refer to
).
• Service data output (Refer to
).
• Actuator test (Refer to
• Freeze frame data output (Refer to ).
All the above items can be diagnosed using M.U.T.-
III.
CHECK OF FREEZE FRAME DATA
The freeze frame data can be checked by using the
M.U.T.-III.
When detecting fault and storing the diagnosis code,
the ECU connected to CAN bus line obtains the data
before the determination of the diagnosis code and
the data when the diagnosis code is determined, and
then stores the ECU status of that time. By analysing
each data from M.U.T.-III, the troubleshooting can be
performed more efficiently. The displayed items are
as the table below.
TROUBLESHOOTING
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-8
Display item list
Item No.
Item name
Data item
Unit
1
Odometer
Total driving distance after the diagnosis code is
generated
km
2
Ignition cycle
Number of times the ignition switch is turned "ON" or
"LOCK (OFF)" after the past failure transition
Number of
counts is
displayed.
4
Accumulated minute Cumulative time for current malfunction of diagnosis
code
min
5
Power supply
voltage
Voltage of power supply when the diagnosis code is
generated
V
8
Lateral G sensor
Lateral G of G and yaw rate sensor when the
diagnosis code is generated
G
9
G sensor
Longitudinal G of G and yaw rate sensor when the
diagnosis code is generated
G
10
Master cylinder
pressure
Master cylinder pressure of Master cylinder pressure
sensor when the diagnosis code is generated
bar
11
Steering angle
Steering angle of steering wheel sensor when the
diagnosis code is generated
bar
12
Yaw rate sensor
Yaw rate of G and yaw rate sensor when the
diagnosis code is generated
G
13
Stop lamp switch
Stop lamp switch condition when the diagnosis code
is generated: OFF/ON
−
21
Pump motor
Pump motor condition when the diagnosis code is
generated: OFF/ON
−
28
ASC/TCL off switch
ASC OFF switch condition when the diagnosis code
is generated: OFF/ON
−
301
ABS control
ABS control when the diagnosis code is generated:
OFF/ON
−
302
Brake TCL control
Traction control (brake control) when the diagnosis
code is generated: OFF/ON
−
303
Engine TCL control
Traction control (engine control) when the diagnosis
code is generated: OFF/ON
−
304
ASC control
ASC control when the diagnosis code is generated:
OFF/ON
−
305
Brake TCL operation Traction control (brake control) operation when the
diagnosis code is generated: Permission/Prohibition
−
401
FL wheel speed
sensor
Wheel speed (FL) when the diagnosis code is
generated
km/h
402
FR wheel speed
sensor
Wheel speed (FR) when the diagnosis code is
generated
km/h
403
RL wheel speed
sensor
Wheel speed (RL) when the diagnosis code is
generated
km/h
404
RR wheel speed
sensor
Wheel speed (RR) when the diagnosis code is
generated
km/h
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