Mitsubishi L200. Manual - part 470

AC309090

Depressed

Released

Pressure increase

Pressure decrease

Pressure hold

Lock

Drag force when the
pedal is free

Pedal operation

Solenoid valve
operation (ABS)

Solenoid valve
operation (ASC, ATC)

Checking the brake force

AD

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

1 s

2 s

3 s

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

2 s

1 s

Pressure increase

Pressure decrease

Pressure hold

ON-VEHICLE SERVICE

ACTIVE STABILITY & TRACTION CONTROL SYSTEM (ASTC)

35C-136

10.Turn the wheel by hand and check the change in 

braking force when the brake pedal is depressed. 
When using the braking force tester, depress the 
brake pedal until the braking force is at the 
following values, and check that the braking force 
changes to the brake drag force reading taken in 
step 2 when the actuator is force-driven. The 
result should be as shown in the diagram above.

Front wheel

785 

− 981 N

Rear wheel

588 

− 784 N

11.If the result of inspection is abnormal, repair 

according to the Diagnosis Table below.

Diagnosis Table
M.U.T.-III Display

Operation

Inspection 
result

Judgeme
nt

Probable cause Remedy

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

• Depress brake 

pedal to lock 
wheel.

• Using M.U.T.-III, 

select the wheel to 
be checked and 
force the actuator 
to operate.

• Turn the selected 

wheel manually to 
check the change 
of brake force.

Brake force is 
released for 
three seconds 
after wheels 
have been 
locked.

Normal

−

−

Wheel does not 
lock when 
brake pedal is 
depressed.

Abnormal

Clogged brake 
line other than 
hydraulic unit

Check and 
clean brake 
line

Clogged 
hydraulic circuit 
in hydraulic unit

Replace 
hydraulic 
unit 
assembly

Brake force is 
not released

Incorrect 
hydraulic unit 
brake tube 
connection

Connect 
correctly

Hydraulic unit 
solenoid valve 
not functioning 
correctly

Replace 
hydraulic 
unit 
assembly

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

• Using M.U.T.-III, 

select the wheel to 
be checked and 
force the actuator 
to operate.

• Turn the selected 

wheel manually to 
check the change 
of brake force.

The wheel is 
locked for three 
seconds from 
the state 
without braking 
force.

Normal

−

−

The wheel is 
not locked.

Abnormal

• Incorrect 

hydraulic unit 
brake tube 
connection

• Clogged 

brake line 
other than 
hydraulic unit

Check and 
clean brake 
line

Clogged 
hydraulic circuit 
in hydraulic unit

Replace 
hydraulic 
unit 
assembly

ON-VEHICLE SERVICE

ACTIVE STABILITY & TRACTION CONTROL SYSTEM (ASTC)

35C-137

12.After inspection, disconnect M.U.T.-III 

immediately after turning the ignition switch to the 
"LOCK" (OFF) position. 

Hydraulic unit installation adjustment
Refer to 

P.35C-140

.

1. Operate the pre-removal steps for the hydraulic 

unit.

2. Remove all brake tubes.
3. Remove the protector.
4. Loosen the mounting bolt and nut of the hydraulic 

unit bracket.

5. Install all brake tubes temporarily.
6. Shake hydraulic unit to all directions with both 

hands to make the hydraulic unit bracket insulator 
fit with the unit.

ON-VEHICLE SERVICE

ACTIVE STABILITY & TRACTION CONTROL SYSTEM (ASTC)

35C-138

7. Install the the hydraulic unit bracket with mounting 

bolt and nut not to load the brake tube.

8. Install the protector.
9. Install all brake tubes securely.

NOTE: Install the flare nut taking care not to let 
the brake tube turn together.

10.Operate the post-installation steps of the 

hydraulic unit.

IN THE EVENT OF A DISCHARGED 
BATTERY

M1355006200072

WARNING

If the ABS is not operating, the vehicle will be 
unstable during braking, Do not drive the 
vehicle with the ASTC-ECU connector dis-
connected or with the ASC/ATC not operat-
ing for any other reason.

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 ABS 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

M1355009300078

CAUTION

If the work below is done, finally calibrate the G 
and yaw rate sensor. This is necessary because 
the ASTC-ECU should update the G and yaw rate 
sensor neutral point.

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

1. Park the vehicle on a level surface.

CAUTION

Before connecting or disconnecting the M.U.T.-
III, turn the ignition switch to the "LOCK" (OFF) 
position.
2. Connect M.U.T.-III to the diagnosis connector.
3. Turn the ignition switch to the "ON" position.
4. Select "System Select".
5. Select "ABS/ASC/ASTC/WSS".
6. Select "Special function".
7. Select "Lateral G Sensor Calibration".
8. Turn the ignition switch to the "LOCK" (OFF) 

position.

9. Disconnect M.U.T.-III.

STEERING WHEEL SENSOR 
CALIBRATION

M1355009200071

CAUTION

If the work below is done, finally calibrate the 
steering wheel sensor. This is necessary 
because the ASTC-ECU should update the steer-
ing wheel sensor neutral point.

• Front alignment adjustment
• Steering wheel sensor removal and installa-

tion

1. Park the vehicle on a level surface.

CAUTION

Before connecting or disconnecting the M.U.T.-
III, turn the ignition switch to the "LOCK" (OFF) 
position.
2. Connect M.U.T.-III to the diagnosis connector.
3. Turn the ignition switch to the "ON" position.
4. Select "System Select".
5. Select "Steering angle sensor".
6. Select "Special function".
7. Select "SAS Calibration".
8. Turn the ignition switch to the "LOCK" (OFF) 

position.

9. Disconnect M.U.T.-III.

ASC SWITCH

ACTIVE STABILITY & TRACTION CONTROL SYSTEM (ASTC)

35C-139

ASC SWITCH

REMOVAL AND INSTALLATION

M1353006900042

AC509443AC

1

2

2

<Vehicles without
rear differential lock>

<Vehicles with
rear differential lock>

Removal steps 

1.

Lower panel assembly (Refer to 
GROUP 52A, Instrument panel 
assembly ).

2.

ASC switch

INSPECTION

M1353007100027

ASC SWITCH CONTINUITY CHECK

AC400824AB

1. As shown in the figure, connect the circuit tester 

to the ASC switch as a single unit.

2. Check the continuity status when the ASC switch 

is pressed and when the switch is released.

Item

When the ASC 
switch is 
released (Not 
being operated)

When the ASC 
switch is 
pressed

Continuity 
between 
terminal No. 1 
and No. 2

No continuity

Continuity exists 
(2 

Ω or less)

Continuity 
between 
terminal No. 3 
and No. 4

Continuity exists Continuity exists