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