Mitsubishi Lancer Evolution X. Manual — part 205

ON-VEHICLE SERVICE

TSB Revision

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-285

4. When carrying out the actuator tests No. 01 to 04, perform

the actuator tests using scan tool while depressing the brake
pedal. When carrying out the actuator tests No.05 to 08,
perform the actuator tests using scan tool without
depressing the brake pedal. When carrying out the actuator
tests, rotate the wheel by hands to confirm that the braking
force changes.
NOTE:

.

•

While performing the actuator test, the ABS warning light
flashes at a rate of 2 Hz.

•

When ASC-ECU is disabled due to the fail-safe function,
the M.U.T.-III actuator test cannot be performed.

•

After the actuator test has been performed, the ABS
warning light, brake warning light, ASC warning display,
and ASC OFF indicator light illuminate until the ignition
switch is turned to ON again or the communication
between scan tool and ASC-ECU is terminated.

AC400780AE

M.U.T.-III actuator test
(No.01, 02, 03, 04) start

M.U.T.-III actuator test
(No.05, 06, 07, 08) start

M.U.T.-III actuator test
(No.01, 02, 03, 04)

M.U.T.-III actuator test
(No.05, 06, 07, 08)

M.U.T.-III actuator test
(No.05, 06, 07, 08)

M.U.T.-III actuator test
(No.01, 02, 03, 04)

Pedal operation

Depressed

Released

Solenoid valve position
(ABS)

Increase in pressure

Steady pressure

Reduction in pressure

Increase in pressure

Steady pressure

Reduction in pressure

Solenoid valve position
(TCL)

Checking the brake force

Checking the brake force

Lock

When the pedal is free

Those with a braking effort

Approx.
1 seconds

Approx.
1 seconds

Approx.
2 seconds

Approx.
2 seconds

Approx.
3 seconds

Approx.
3 seconds

Those without a braking effort

ON-VEHICLE SERVICE

TSB Revision

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-286

5. This is indicated as shown in the above.
6. When any malfunction has been found, take a necessary

action according to the "Judgment Table."

Judgment Table

7. After the inspection, turn the ignition switch to the LOCK

(OFF) position, and then disconnect scan tool.

Display on scan
tool

Operation

Inspection result Judgment Probable cause

Remedy

01 FL wheel
ABS drive
02 FR wheel
ABS drive
03 RL wheel
ABS drive
04 RR wheel
ABS drive

• Depress the brake

pedal to lock the
vehicle.

• Select the vehicle

to be inspected
using scan tool,
perform the
actuator test.

• Rotate the selected

wheel by hands to
confirm the braking
force.

Braking force
decreases for 3
seconds from
the lock status.

Normal

−

−

The wheel
does not lock
even if the
brake pedal is
depressed.

Error

Clogged brake line
other than hydraulic
unit

Check and
clean the brake
line.

Clogged hydraulic
circuit in the hydraulic
unit

Replace the
hydraulic unit
assembly.

Braking force
does not
decrease.

Faulty routing of
hydraulic unit brake
tube

Route the
brake tube
correctly.

Malfunction of
hydraulic unit solenoid
valve operation

Replace the
hydraulic unit
assembly.

05 FL wheel
TCL drive
06 FR wheel
TCL drive
07 RL wheel
TCL drive
08 RR wheel
TCL drive

• Select the vehicle

to be inspected
using scan tool,
perform the
actuator test.

• Rotate the selected

wheel by hands to
confirm the braking
force.

Lock condition
occurs for 3
seconds from
the status
without braking
force.

Normal

−

−

The wheel
does not lock.

Error

• Faulty routing of

hydraulic unit brake
tube

• Clogged brake line

other than hydraulic
unit

Check and
clean the brake
line.

Clogged hydraulic
circuit in the hydraulic
unit

Replace the
hydraulic unit
assembly.

ON-VEHICLE SERVICE

TSB Revision

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-287

IN THE EVENT OF A DISCHARGED BATTERY

M1355006200146

WARNING

If the ASC is not operating, the vehicle will be unsta-
ble during braking, Do not drive the vehicle with the
ASC-ECU connector disconnected or with the ASC
not operating.

If the engine is started using a booster cable when the battery
is completely flat, and the vehicle is then driven without waiting
for the battery to be recharged, the engine may misfire and it
may not be possible to drive the vehicle. This is because the
ASC consumes a large amount of current when carrying out its
initial checks. If this happens, recharge the battery fully.

G AND YAW RATE SENSOR CALIBRATION

M1355009300142

CAUTION

Before performing calibration, check that the G and yaw
rate sensor-related diagnostic trouble code is not set.

CAUTION

After the next operation has been completed, carry out the
calibration to make ASC-ECU learn the neutral point of the
G and yaw rate sensor.

• G and yaw rate sensor replacement
• ASC-ECU replacement

.

<Vehicles without TC-SST>

1. Park the vehicle on a level surface.
2. Turn the ignition switch to the ON position.
3. Turn the ignition key to the LOCK (OFF) position.

CAUTION

Before connecting or disconnecting scan tool, always turn
the ignition switch to the LOCK (OFF) position.
4. Check that the ignition key is in the LOCK (OFF) position,

and then set scan tool.

5. Turn the ignition switch to the ON position.
6. On the Menu, select "System selection."
7. On the "System selection," select "ABS/ASC/ASTC/WSS" in

the "System table," and then click the "OK" button.

8. In the "ABS/ASC/ASTC/WSS" field, select "Special

function".

9. In the "Special function," select "Learn sensor neutral

position."

10.Among the selected items, select "Learn G-sensor neutral

position" and then press the "OK" button.

11."Learn G-sensor neutral position: Are you sure to execute

the selected item? Note: Check the execution conditions." is
displayed. Then, press the "OK" button.

12."Execute command: Executed" is displayed. Then, press

the "OK" button.

ON-VEHICLE SERVICE

TSB Revision

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-288

13.Among the selected items, select "Learn lateral G-sensor

neutral position" and then press the "OK" button.

14."Learn lateral G-sensor neutral position: Are you sure to

execute the selected item? Note: Check the execution
conditions." is displayed. Then, press the "OK" button.

15."Execute command: Executed" is displayed. Then, press

the "OK" button.

16.The neutral point is learned.
17.Turn the ignition key to the LOCK (OFF) position, and

remove scan tool from the vehicle.

.

<Vehicles with TC-SST (When the G and yaw rate
sensor is replaced)>

1. Perform Step 1−15 of G and yaw rate sensor calibration

vehicle without TC-SST.

2. On the Menu, select "System selection."
3. On the "System selection," select "ACD/AYC" in the "System

table," and then click the "OK" button.

4. In the "ACD/AYC" field, select "Special function".
5. In the "Special function," select "Learn sensor neutral

position."

6. Among the selected items, select "Learn lateral G-sensor

neutral position" and then press the "OK" button.

7. "Learn lateral G-sensor neutral position: Are you sure to

execute the selected item? Note: Check the execution
conditions." is displayed. Then, press the "OK" button.

8. "Execute command: Executed" is displayed. Then, press the

"OK" button.

9. Among the selected items, select "Learn G-sensor neutral

position" and then press the "OK" button.

10."Learn G-sensor neutral position: Are you sure to execute

the selected item? Note: Check the execution conditions." is
displayed. Then, press the "OK" button.

11."Execute command: Executed" is displayed. Then, press the

"OK" button.

12.The neutral point is learned.
13.Turn the ignition key to the LOCK (OFF) position, and

remove scan tool from the vehicle.