Mitsubishi Lancer Evolution X. Manual - part 205

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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

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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.

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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.

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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.