Mitsubishi Montero (2004+). Manual — part 1069

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-119

ACX01113AC

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

1s

2s

ITEM No. 01 - 04 DRIVE PATTERN

CONTROL SOLENOID
VALVE IN

CONTROL SOLENOID
VALVE OUT

SELECT SOLENOID
VALVE (FR)

SELECT SOLENOID
VALVE (FL)

CORRESPONDING
WHEEL BRAKE PRESSURE

INCREASE

DECREASE

HOLD

INCREASE

ITEM No. 09, 10 DRIVE PATTERN

CONTROL SOLENOID
VALVE OUT (RH)*

CONTROL SOLENOID
VALVE OUT (LH)*

<ITEM No. 10 ONLY>

SELECT SOLENOID
VALVE (FR)

SELECT SOLENOID
VALVE (FL)

NOTE
*: WHEN CARRYING OUT ITEM No. 09, THE FRONT WHEELS ARE DRIVEN, AND WHEN
CARRYING OUT ITEM No. 10 THE REAR WHEELS ARE DRIVEN.

0.8s 0.8s

2.5s

0.8s

2.5s

0.8s 0.8s

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-120

CHECK AT M-ASTC-ECU

M1352011800402

TERMINAL VOLTAGE CHECK CHART

NOTE: There are two ECUs with the same shape inside the
floor console, one above the other. The upper ECU is the
M-ASTC-ECU. The lower ECU is the transfer-ECU.
NOTE: Do not measure terminal voltage for approximately
three seconds after the ignition switch is turned "ON." The
M-ASTC-ECU performs the initial check during that period.
1. Measure the voltages between terminals (4), (12), (56) or

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

2. The terminal layouts are shown in the illustrations.

AC203901

AC204627AY

M-ASTC-ECU

M-ASTC-ECU CONNECTORS

TRANSFER-ECU

CONNECTOR
TERMINAL NO.

SIGNAL

CHECKING REQUIREMENT

NORMAL
CONDITION

1

Control solenoid valve
OUT (Rear right wheel)

Ignition switch: ON

Battery positive
voltage

2

Control solenoid valve IN
(Rear right wheel)

Ignition switch: ON

Battery positive
voltage

3

Control solenoid valve
OUT (Front left wheel)

Ignition switch: ON

Battery positive
voltage

5

PI valve

Ignition switch: ON

Battery positive
voltage

6

Cut valve

Ignition switch: ON

Battery positive
voltage

7

Select solenoid valve
(Front right wheel)

Ignition switch: ON

Battery positive
voltage

8

Select solenoid valve
(Front left wheel)

Ignition switch: ON

Battery positive
voltage

10

Control solenoid valve IN
(Front left wheel)

Ignition switch: ON

Battery positive
voltage

19

Stoplight switch input

Stoplight switch: ON

Battery positive
voltage

Stoplight switch: OFF

2 V or less

24

M-ASTC-ECU power
supply

Ignition switch: ON

Battery positive
voltage

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-121

42

Control solenoid valve IN
(Front right wheel)

Ignition switch: ON

Battery positive
voltage

43

Control solenoid valve
OUT (Front right wheel)

Ignition switch: ON

Battery positive
voltage

44

Control solenoid valve IN
(Rear left)

Ignition switch: ON

Battery positive
voltage

45

Control solenoid valve
OUT (Rear light wheel)

Ignition switch: ON

Battery positive
voltage

50

Pressure sensor power
supply

Ignition switch: ON

Approximately 5 V

55

Valve relay monitor

Ignition switch: ON

Battery positive
voltage

59

Pressure sensor

Ignition switch: ON

Approximately
0.14

− 4.85 V

62

ABS warning light output Ignition

switch: ON

When light is switched off

Battery positive
voltage

When light is illuminated

2 V or less

74

Active skid control
system operation
warning light output

Ignition
switch: ON

When light is switched off

Battery positive
voltage

When light is illuminated

2 V or less

75

2WD/4WD detection
switch input

Ignition
switch: ON

Transfer selector lever
position: 2H, 4H

Battery positive
voltage

Transfer selector lever
position: 4HLc, 4LLc

2 V or less

76

4LLc detection switch
input

Ignition
switch: ON

Transfer selector lever
position: 4LLc

Battery positive
voltage

Transfer selector lever
position: 2H, 4H, 4HLc

2 V or less

80

Center differential lock
switch input

Ignition
switch: ON

Transfer selector lever
position: 2H, 4H

Battery positive
voltage

Transfer selector lever
position: 4HLc, 4LLc

2 V or less

81

Brake warning light
output

Ignition
switch: ON

When light is switched off

2 V or less

When light is illuminated

Battery positive
voltage

CONNECTOR
TERMINAL NO.

SIGNAL

CHECKING REQUIREMENT

NORMAL
CONDITION

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-122

RESISTANCE AND CONTINUITY BETWEEN
HARNESS-SIDE CONNECTOR TERMINALS

NOTE: There are two ECUs with the same shape inside the
floor console, one above the other. The upper ECU is the
M-ASTC-ECU and has a blue connector. The lower ECU is the
transfer-ECU and has a green connector.
1. Turn the ignition switch to the "LOCK" (OFF) position and

disconnect the M-ASTC-ECU.

2. Check between the terminals indicated in the table below.
3. The terminal layouts are shown in the illustration.

86

2WD detection switch
input

Ignition
switch: ON

Transfer selector lever
position: 2H

Battery positive
voltage

Transfer selector lever
position: 4H, 4HLc, 4LLc

2 V or less

87

4H detection switch input Ignition

switch: ON

Transfer selector lever
position: 2H, 4LLc

Battery positive
voltage

Transfer selector lever
position: 4H, 4HLc

2 V or less

CONNECTOR
TERMINAL NO.

SIGNAL

CHECKING REQUIREMENT

NORMAL
CONDITION

AC203901

AC204627AY

M-ASTC-ECU

M-ASTC-ECU CONNECTORS

TRANSFER-ECU

CONNECTOR
TERMINAL NO.

SIGNAL

NORMAL CONDITION

30

− 31

Front-left ABS sensor

1.0

− 1.5 kΩ

60

− 61

Rear-right ABS sensor

1.0

− 1.5 kΩ

46

− 47

Rear-left ABS sensor

1.0

− 1.5 kΩ

27

− 28

Front-right ABS sensor

1.0

− 1.5 kΩ

4

− body ground

Ground

Less than 2 ohms

22

− body ground

Ground

Less than 2 ohms

56

− body ground

Ground

Less than 2 ohms

64

− body ground

Ground

Less than 2 ohms