Mitsubishi L200. Manual — part 421

GENERAL INFORMATION

ANTI-SKID BRAKING SYSTEM (ABS)

35B-5

SYSTEM CONFIGURATION DIAGRAM

AC800759AB

Wheel speed sensor (FL)

FR solenoid valve (OUT)

FR solenoid valve (IN)

FL solenoid valve (OUT)

FL solenoid valve (IN)

RR solenoid valve (OUT)

RR solenoid valve (IN)

RL solenoid valve (OUT)

RL solenoid valve (IN)

Stop lamp switch

ECU power supply

ABS-ECU

Combination meter
(Brake warning lamp,
ABS warning lamp)

Diagnosis connector

Wheel speed sensor (RL)

Wheel speed sensor (RR)

Wheel speed sensor (FR)

Stop
lamp
switch

Rear-right wheel (RR)

Front-right wheel (FR)

Wheel speed sensor

Hydraulic unit

Front-left wheel (FL)

Rear-left wheel (RL)

G-sensor <4WD>

Wheel speed
sensor

Wheel speed
sensor

Wheel speed sensor

G-sensor
<4WD>

Rear differential
lock detection switch
<Vehicles with rear differential lock>

Rear differential
lock detection switch
<Vehicles with rear differential lock>

NOTE: Broken lines show CAN-bus line.

SERVICE SPECIFICATIONS

ANTI-SKID BRAKING SYSTEM (ABS)

35B-6

ABS ELECTRICAL CIRCUIT DIAGRAM

AC903839

Front wheel
speed sensor

Rear wheel
speed sensor

(RH)

(RH)

(LH)

(LH)

Diagnosis
connector

AB

Motor power source

Solenoid valve power source

ABS-ECU

Motor power source

Solenoid valve

Hydraulic unit

Stop lamp
switch

No.12
15A

Fusible
link No.23

Ignition
switch (IG1)

Relay
box

Fusible
link No.22

Fusible
link No.21

No.15
7.5A

J/B
(Fuse)

G-sensor

No.12
15A

Fusible
link No.20

Combination meter

ABS
warning
lamp

Brake
warning
lamp

<4WD>

Rear differential
lock detection
switch

ON

OFF

<Vehicles with rear
differential lock>

ON

OFF

GND

SERVICE SPECIFICATIONS

M1352000301150

Item

Standard value

Wheel speed sensor current mA

5

− 9 or 11 − 17

Wheel speed sensor insulation resistance M

Ω

1.5 or more

G-sensor voltage V <4WD>

Stationary vehicles

2.4

− 2.6

Arrow mark downward

3.55

− 3.95

Power supply from the ABS-ECU 4.75

− 5.25

SPECIAL TOOLS

ANTI-SKID BRAKING SYSTEM (ABS)

35B-7

SPECIAL TOOLS

M1352000601850

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 simulated
vehicle speed. If you
connect M.U.T.-III main
harness B instead, the
CAN communication
does not function
correctly.
ABS check (Diagnosis
code display, and data list
display by M.U.T.-III)

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-8

TROUBLESHOOTING

STANDARD FLOW OF DIAGNOSTIC
TROUBLESHOOTING

M1352011100867

Refer to GROUP 00, How to Use Troubleshooting/
Inspection Service Points .

NOTES WITH REGARD TO DIAGNOSIS

M1352012600296

1. The ABS is a system which controls the brake

pressure by means of the operation of the ECU.
Accordingly, the following symptoms may occur at
times, but these are a sign of normal ABS
operation, and do not indicate a malfunction.

Phenomenon

Explanation of phenomenon

When the engine starts, a knocking sound can be heard coming
from the engine compartment.

This sound occurs as a result of system
operation checking, and is not a
malfunction.

• Sound of the motor inside the ABS hydraulic unit operation.

(whine)

• Sound is generated along with vibration of the brake pedal.

(scraping)

• When ABS operates, sound is generated from the vehicle

chassis due to repeated brake application and release.
(Thump: suspension; squeak: tyres)

This is the sound of normal system
operation, and is not a malfunction.

Shocks are felt if the brake pedal is depressed when driving at
low speed.

This is due to system operation checking
(starting-of check when the vehicle speed
reaches a certain number of km/h) and is
not a malfunction.

2. For road surfaces such as snow-covered roads

and gravel roads, the braking distance for
vehicles with ABS can sometimes be longer than
that for other vehicles. Accordingly, advise the
customer to drive safely on such roads by
lowering the vehicle speed and not being too

overconfident.

3. Diagnosis detection condition can vary depending

on the diagnosis code. Make sure that checking
requirements listed in the "Comment" are satisfied
when checking the trouble symptom again.

MB991709

Wiring harness set

Checking the ABS-ECU
and output current
measure at the wheel
speed sensor

MB991348

MB991348

Test harness set

Checking the G-sensor
<4WD>

MB992006

MB992006

Extra fine probe

Continuity check and
voltage measurement at
harness wire or connector

Tool

Number

Name

Use