Mitsubishi Galant. Manual - part 526

 

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Mitsubishi Galant. Manual - part 526

 

 

ANTI-SKID BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM(ABS)

35B-37

STEP 6. Check the harness wire between combination 
meter connector C-30 and ABS warning light relay 
connector A-10X.
(1) Remove the combination meter. (Refer to GROUP 54A, 

Combination Meter

P.54A-65

.)

(2) Check the harness wire between combination meter of 

connector C-30 terminal 8 and ABS warning light relay 
connector A-10X terminal 5.

Q: Are any harness wire between the combination meter 

connector A-30 and ABS warning light relay connector 
A-10X damage?
YES : 
Replace the ABS-ECU then go to Step 7.
NO :  Repair the harness wire and then go to Step 7.

STEP 7. Check symptoms

Q: Does the ABS warning light remain illuminated after the 

engine is started?
YES : 
Return to Step 1.
NO :  This diagnosis is complete.

INSPECTION PROCEDURE 4 , Faulty ABS operation

TECHNICAL DESCRIPTION (COMMENT)
The cause depends on driving and road surface 
conditions, so diagnosis may be difficult. However, if 
no diagnostic trouble code is displayed, carry out the 
following inspection.

TROUBLESHOOTING HINTS
The most likely cause for this case:

Malfunction of the hydraulic unit

DIAGNOSIS

Check the hydraulic unit.

Refer to 

P.35B-43

. If the hydraulic unit (integrated with 

ABS-ECU) is malfunctioning, replace it. Then check that the 
malfunction symptom is eliminated.

DATA LIST REFERENCE TABLE

M1352011500070

The following items can be read by the scan tool 
from the ABS-ECU input data.

AC003919

CONNECTOR: C-30

AB

AC003923 AB

CONNECTOR: A-10X

RELAY BOX IN

ENGINE 

COMPARTMENT

ANTI-SKID BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM(ABS)

35B-38

ACTUATOR TEST REFERENCE TABLE

M1352011600055

The scan tool activates the following actuators for 
testing.

NOTE: If the ABS-ECU is inoperative, actuator 
testing cannot be carried out.

NOTE: Actuator testing is only possible when the 
vehicle is stationary. If the vehicle speed during 
actuator testing exceeds 10 km/h (6 mph), forced 
actuation will be canceled.

ACTUATOR TEST SPECIFICATIONS

CHECK AT ABS-ECU

M1352011800071

TERMINAL VOLTAGE CHECK CHART
1. Measure the voltages between terminals (8) and 

(24) (ground terminals) and each respective 
terminal.

2. The terminal layouts are shown in the illustrations 

below.

MUT-II SCAN 
TOOL DISPLAY

ITEM NO.

CHECK ITEM

CHECKING
REQUIREMENTS

NORMAL VALUE

ECU VOLTAGE

16

ABS-ECU power supply 
voltage

Ignition switch power 
supply voltage and valve 
monitor voltage

 16 V

FR SNSR

11

Front-right wheel speed 
sensor

Drive the vehicle

Vehicle speeds 
displayed on the 
speedometer and 
scan tool are 
identical.

FL SNSR

12

Front-left wheel speed 
sensor

RR SLSR

13

Rear-right wheel speed 
sensor

RL SNSR

14

Rear-left wheel speed 
sensor

STOPLIGHT SW 36

Stoplight switch

Depress the brake pedal. ON

Release the brake pedal. OFF

NO.

ITEM

PARTS TO BE
ACTIVATED

01Solenoid valve for 

front-left wheel

Solenoid valves and 
pump motors in the 
hydraulic unit (simple 
inspection mode)

02

Solenoid valve for 
front-right wheel

03

Solenoid valve for 
rear-left wheel

04

Solenoid valve for 
rear-right wheel

AC000971AC

ACTIVATION PATTERN

A

B

C

SOLENOID
VALVE

END OF
FORCED
ACTION

START OF
FORCED
ACTION

1 s

2 s

PUMP
MOTOR

ON

OFF

NOTE
A:
B:
C:

HYDRAULIC PRESSURE DECREASES
HYDRAULIC PRESSURE HOLDS
HYDRAULIC PRESSURE INCREASES

ANTI-SKID BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM(ABS)

35B-39

NOTE: Do not measure terminal voltage for 
approximately three seconds after the ignition switch 
is turned "ON." The ABS-ECU performs the initial 
check during that period.

RESISTANCE AND CONTINUITY BETWEEN 
HARNESS-SIDE CONNECTOR TERMINALS
1. Turn the ignition switch to the "LOCK" (OFF) 

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

2. Check between the terminals indicated in the 

table below.

3. The terminal layouts are shown in the illustration 

below.

AC003648

CONNECTOR
TERMINAL 
NO.

SIGNAL

CHECKING REQUIREMENT

NORMAL 
CONDITION

4

ABS-ECU 
power supply

Ignition switch: "ON" 

Battery positive 
voltage

Ignition switch: "START" 

Approximately 0 V

7

Scan tool

Connect the scan tool

Serial communica-
tion with scan tool

Do not connect the scan tool

1 V or less

9

Solenoid valve 
power supply

Always

Battery positive 
voltage

14

Input from
diagnostic 
indication selection

Connect the scan tool

Approximately 0 V

Do not connect the scan tool

Approximately 12 V

16

Output to ABS 
warning light 
relay control

Ignition switch: 
"ON"

The light is switch off.

1 V or less

The light is illuminated.

Battery positive 
voltage

18

Input from stoplight 
switch

Stoplight switch: "ON"

Battery positive
voltage

Stoplight switch: "OFF"

Approximately 0 V

25

Motor power sup-
ply

Always

Battery positive
voltage

ANTI-SKID BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM(ABS)

35B-40

AC003647

CONNECTOR
TERMINAL NO.

SIGNAL

NORMAL CONDITION

 2

Front-left wheel speed sensor

1.28 

 1.92 k

22 

 23

Rear-right wheel speed sensor

1.28 

 1.92 k

19 

 20

Front-right wheel speed sensor

1.28 

 1.92 k

 6

Rear-left wheel speed sensor

1.28 

 1.92 k

 body ground

Solenoid valve ground

Continuity

24 

 body ground

Motor ground

Continuity

 

 

 

 

 

 

 

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