Mitsubishi 380. Manual - part 965

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-85

GROUND RESISTANCE AND CONTINUITY 
BETWEEN HARNESS-SIDE CONNECTOR 
TERMINALS AND BODY GROUND

Required Special Tool:
MB991219: Inspection Test Harness
1. Turn the ignition switch to the "LOCK" (OFF) position and 

disconnect the ABS-ECU connectors before checking 
resistance and continuity.

2. Using the Inspection Test Harness (MB991219) to probe the 

wiring harness-side connector, check the resistance and 
continuity between the terminals indicated in the table 
below.

3. The terminal layout is shown in the illustration.

NOTE: If the ABS-8 ECU or the active wheel speed sensor are 

disconnected, or if the wiring is an open/ short circuit, the ABS 
8 ECU will shut off power supply to the respective wheel speed 
sensor. All other wheel speed sensors will operate normally. To 
restore the power supply, the ignition switch must be turned to 
the "OFF" position then to the "ON" position again.

35DB098A

CONNECTOR: A-02

HYDRAULIC UNIT

(WITH BUILT-IN ABS-ECU)

TEST 

HARNESS

(MB991219)

CONNECTOR TERMINAL NO.

SIGNAL

NORMAL CONDITION

1 

− body ground

Ground

Less than 2 ohms

4 

− body ground

Ground

Less than 2 ohms

SPECIAL TOOLS

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-86

SPECIAL TOOLS

M1352000600653

TOOL

TOOL NUMBER AND NAME SUPERSESSION

APPLICATION

MB991958

A: MB991824
B: MB991827
C: MB991910
D: MB991911
E: MB991914
F: MB991825
G: MB991826

MUT-III Sub Assembly

A: Vehicle Communication 

Interface (V.C.I.)

B: MUT-III USB Cable
C: MUT-III Main Harness A 

(Vehicles with CAN 
communication system)

D: MUT-III Main Harness B 

(Vehicles without CAN 
communication system)

E: MUT-III Main Harness C 

(for Daimler Chrysler 
models only)

F: MUT-III Adapter Harness
G: MUT-III Trigger Harness

MB991824

−KIT

NOTE: G: MB991826 
MUT-III Trigger 
Harness is not 
necessary when 
pushing V.C.I. ENTER 
key.

Checking diagnostic 
trouble codes

CAUTION

For vehicles with CAN 
communication, use 
MUT-III main harness A 
to send simulated 
vehicle speed. If you 
connect MUT-III main 
harness B instead, the 
CAN communication 
does not function 
correctly.

MB991910

MB991826

MB991958

MB991911

MB991914

MB991824

MB991827

MB991825

DO NOT USE

A

B

C

D

E

F

G

DO NOT USE

SPECIAL TOOLS

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-87

MB991223 
Harness set
 (A): MB991219
 Inspection harness
 (B): MB991222
 Back probing tool

General service tools

(A): Resistance 
measurement between 
ABS-ECU and wheel 
speed sensors
ABS-ECU terminal 
voltage measurement
ABS-ECU terminal 
(ground) resistance 
measurement
(B): ABS-ECU wheel 
speed sensor signal 
voltage measurement
ABS-ECU wheel speed 
sensor signal 
measurement

TOOL

TOOL NUMBER AND NAME SUPERSESSION

APPLICATION

MB991222

A

B

ON-VEHICLE SERVICE

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-88

ON-VEHICLE SERVICE

WHEEL SPEED SENSOR SIGNAL 
MEASUREMENT

M1352001600667

Required Special Tool:
MB991222: Back probing tool
1. ABS connector (A-02) must remain connected to hydraulic 

unit when checking signal measurements.

2. Remove ABS connector protection cap to access terminal 

location from rear of connector for backprobing.

3. Release the parking brake and lift up the vehicle.
4. Use probe tool MB991222 to measure the output signal at 

the ABS connector A-02 by back probing the terminal 
positions shown in the table below.

NOTE: To check wheel speed sensor connectors, remove 
the rear seat to access the rear wheel speed sensor connec-
tions and remove inner guard (splash shield) to access front 
wheel speed sensors, to confirm the connection of the sen-
sor harness and connector before using the oscilloscope.

5. Connect oscilloscope (as per figure 2) shows, to the 

appropriate terminal positions by back probing (using probe 
MB991222) and check sensor operation individually with 
scope.
Turn the ignition switch to the "ON" position.

TERMINAL NO.

Front left

Front right

Rear left

Rear right

5

10

17

19

OSCILLOSCOPE

ABS-ECU
  (A-02)

Supply

Signal

WHEEL SPEED
    SENSOR

Wheel speed sensor connectors:
      A-04,  A-01,  D-30,  D-31

Terminals:
 5, 10, 17, 19

FIGURE  2

Red

Black

Ground

35DB122A