Mitsubishi Galant. Manual - part 518

ANTI-SKID BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM(ABS)

35B-5

4. Disconnect special tool MB991529.

Erasing ABS Diagnostic Trouble Codes

Using Scan Tool MB991502

Required Special Tool:

•

MB991502: Scan Tool (MUT-II)

CAUTION

To prevent damage to scan tool MB991502, always turn the 
ignition switch to the "LOOK" (OFF) position before 
connecting or disconnecting the scan tool.
1. Connect scan tool MB991502 to the data link connector.

2. Turn the ignition switch to the "ON" position.

3. Use scan tool MB991502 to erase ABS diagnostic trouble 

codes.

4. Turn the ignition switch to the "LOOK" (OFF) position.

5. Disconnect scan tool MB991502.

By Special Operation for Brake Pedal

Required Special Tool:

•

MB991529: Diagnostic Trouble Code Check Harness

1. Use special tool MB991529 to ground number 1 terminal of 

the data link connector.

NOTE:  If the ABS-ECU functions have stopped due to the 
fail-safe function, the diagnostic trouble code cannot be 
erased.

WHEN THE DIAGNOSTIC TROUBLE CODE NO.24 
IS OUTPUT

WHEN NO DIAGNOSTIC TROUBLE CODE IS OUT-
PUT

ACX01777

ILLUMINATED

SWITCHED
OFF

PAUSE
TIME 3s

TENS
SIGNAL

PLACE
DIVISION
2s

UNITS
SIGNAL

1.5s

0.5s

0.5s

AB

ACX01778

ILLUMINATED

SWITCHED
OFF

0.25s

AB

AC003081 AB

16 PIN

MB991502

AC003716 AB

DATA LINK 
CONNECTOR 

MB991529

ANTI-SKID BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM(ABS)

35B-6

2. Depress the brake pedal and hold it.

3. Turn the ignition switch to the "ON" position.

4. After turning the ignition switch to the "ON", release the 

pedal within three seconds. Repeat this process of pressing 
and releasing the brake pedal 10 continuous times.

5. Turn the ignition switch to the "LOOK" (OFF) position.

6. Disconnect special tool MB991529.

DIAGNOSTIC TROUBLE CODE CHART

M1352011300076

Follow the inspection chart that is appropriate for the 
diagnostic trouble code.

AC000937

IGNITION SWITCH

ON

OFF

STOPLIGHT SWITCH

ON

OFF

ABS WARNING LIGHT

ON

OFF

DIAGNOSTIC TROUBLE
CODE MEMORY

3 s

WITHIN
3 s

WITH-
IN 1 s

WITH-
IN 1 s

WITH-
IN 1 s

WITH-
IN 1 s

WITH-
IN 1 s

WITH-
IN 1 s

WITH-
IN 1 s

WITH-
IN 1 s

WITH-
IN 1 s

WITH-
IN 1 s

1 s

1 s

ERASING
COMPLETED

AB

1ST

2ND

3RD

4TH

5TH

6TH

7TH

8TH

9TH

10TH

DIAGNOSTIC
TROUBLE CODE NO.

INSPECTION ITEM

DIAGNOSTIC CONTENT REFERENCE PAGE

11

Front right wheel speed 
sensor

Open circuit or short cir-
cuit

P.35B-8

12

Front left wheel speed 
sensor

13

Rear right wheel speed 
sensor

14

Rear left wheel speed 
sensor

16

Power supply system

ABS-ECU power supply 
voltage below or above 
the standard value. Not 
displayed if the voltage 
recovers.

Check the battery. (Refer 
to GROUP 54A, Battery 

−

 

On-vehicle Service - 
Battery Check

P.54A-5

)

21Front right wheel speed sensor

P.35B-8

22

Front left wheel speed sensor

23

Rear right wheel speed sensor

24

Rear left wheel speed sensor

38

Stoplight switch system

P.35B-13

ANTI-SKID BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM(ABS)

35B-7

41Solenoid valve inside hy-

draulic unit

Open circuit or short cir-
cuit

P.35B-19

42

ABS-ECU

Replace the hydraulic unit
(Integrated with ABS-
ECU)

51Hydraulic unit solenoid valve relay open or short cir-

cuit

P.35B-19

53

Malfunction of hydraulic unit

P.35B-19

63

ABS-ECU

Replace the hydraulic unit 
(Integrated with ABS-
ECU)

DIAGNOSTIC
TROUBLE CODE NO.

INSPECTION ITEM

DIAGNOSTIC CONTENT REFERENCE PAGE

ANTI-SKID BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM(ABS)

35B-8

DIAGNOSTIC TROUBLE CODE PROCEDURES

DTC 11, 12, 13, 14: Wheel Speed Sensor (Open circuit or short circuit)
DTC 21, 22, 23, 24: Wheel Speed Sensor

AC003851

Wheel Speed Sensor Circuit

AB

AC003855AB

CONNECTORS: A-03, A-22, A-36

A-36

A-03

A-22

AC003856AB

CONNECTOR: C-05

COMBINATION
METER