Mitsubishi Montero (2004+). Manual - part 1028

 

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Mitsubishi Montero (2004+). Manual - part 1028

 

 

HYDRAULIC BRAKE BOOSTER (HBB) DIAGNOSIS

TSB Revision

BASIC BRAKE SYSTEM

35A-111

• The wire between buzzer connector E-107 (terminal 2) and 

transfer-ECU connector E-104 (terminal 51)

NOTE:  Also check intermediate connector E-114 for loose, 
corroded, or damaged terminals, or terminals pushed back in 
the connector. If intermediate connector E-114 is damaged, 
repair or replace the damaged component(s) as described in 
GROUP 00E, Harness Connector Inspection 

P.00E-2

. If the 

connector has been repaired or replaced, go to Step 5.

Q: Is the harness wire damaged?

YES : Repair or replace it and then go to Step 5.
NO :  Replace the buzzer (Refer to 

P.35A-142

). Then go to 

Step 5.

AC204727AB

CONNECTOR: E-107

E-107

HARNESS 
CONNECTOR: 
COMPONENT 
SIDE

E-107

AC204728 AB

CONNECTOR: E-104

E-104

HARNESS CONNECTOR: 
COMPONENT SIDE

E-104

AC204548AN

CONNECTOR: E-114

E-114

HYDRAULIC BRAKE BOOSTER (HBB) DIAGNOSIS

TSB Revision

BASIC BRAKE SYSTEM

35A-112

STEP 5. Retest the system.

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Using scan tool MB991958, check actuator test and sound 

the buzzer.

Q: Does the buzzer sound for three seconds and then 

stop? 
YES : 
The procedure is complete.
NO :  Start over at Step 1.

DATA LIST REFERENCE TABLE

M1352011500683

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

AC307591 AB

MB991911

DATA LINK

CONNECTOR

MB991824

MB991827

MUT-III SCAN 
TOOL DISPLAY

ITEM 
NO.

CHECK ITEM

CHECKING REQUIREMENT

NORMAL 
CONDITION

BATT. 
VOLTAGE

31

M-ASTC-ECU 
power supply 
voltage

Ignition switch: ON

6.5 

− 22.3 V

ACCUM SW 
(PL)

76

Pressure switch (for 
low-pressure 
warning)

Ignition switch: ON

ON

ACCUM SW 
(PH)

77

Pressure switch (for 
pump motor control)

Ignition switch: ON When the pump motor 

is not operating.

OFF

When the pump motor 
is operating.

ON

MOTOR RLY

79

Motor relay A, B

Ignition switch: ON When the pump motor 

is not operating.

OFF

When the pump motor 
is operating.

ON

HYDRAULIC BRAKE BOOSTER (HBB) DIAGNOSIS

TSB Revision

BASIC BRAKE SYSTEM

35A-113

ACTUATOR TEST REFERENCE TABLE

M1351013500103

The scan tool activates the following actuators for 
testing.
NOTE: 

.

If the M-ASTC-ECU is inoperative, actuator test-
ing cannot be carried out.

Actuator testing is only possible when the vehicle 
is stationary.

CHECK AT M-ASTC-ECU

M1351013600069

Terminal Voltage Check Chart

NOTE: Do not measure terminal voltage during the approxi-
mately three seconds after the ignition switch is turned to the 
"ON" position. The M-ASTC-ECU performs the initial check 
during that period.
Measure the voltage between terminal (4), (22), (56) or (64) 
(ground terminals) and each respective terminal by 
backprobing.

MUT-III SCAN 
TOOL DISPLAY

NO.

ITEM

DRIVE CONTENT

Activation when the system fails

HBB MOTOR

11

Pump motor

Drives the pump motor 
for one second.

Disabled

HBB BUZZER

12

Buzzer

Drives the buzzer for 
three seconds.

Disabled

BRKE WARN LMP 23

Brake warning 
light

Illuminates the brake 
warning light.

Enabled (However, disabled when 
the brake warning light can not be 
activated)

AC203901

AC204627AT

M-ASTC-ECU

M-ASTC-ECU CONNECTORS

HYDRAULIC BRAKE BOOSTER (HBB) DIAGNOSIS

TSB Revision

BASIC BRAKE SYSTEM

35A-114

TERMINAL 
NO.

SIGNAL

CHECKING REQUIREMENT

NORMAL CONDITION

9

M-ASTC-ECU 
power supply

Ignition switch: ON

Battery positive voltage

11

Pressure switch 
(Pump motor 
control)

Ignition switch: 
ON

Brake fluid pressure: LOW
(Pump motor operates.)

Approximately 6V

Brake fluid pressure: HIGH
(Pump motor does not operate.)

Less than 2V

12

Pump motor 
current 
detection (

−)

Ignition switch: ON

Less than 2V

14

Pump motor 
current 
detection (+)

Ignition switch: 
ON

Pump motor does not operate.

Less than 2V

Pump motor operates.

Battery positive voltage

24

Motor relay B

Ignition switch: 
ON

Pump motor does not operate.

Battery positive voltage

Pump motor operates.

Less than 2V

25

Pump motor 
monitor

Ignition switch: ON

Less than 2V

48

Motor relay A

Ignition switch: 
ON

Pump motor does not operate.

Battery positive voltage

Pump motor operates.

Less than 2V

54

Buzzer

Ignition switch: 
ON

Buzzer does not sound.

Battery positive voltage

Buzzer sounds.

Less than 2V

57

Pressure switch 
(low-pressure 
warning)

Ignition switch: 
ON

Brake fluid pressure: EXTRA LOW
(Buzzer sounds.)

Approximately 9V

Brake fluid pressure: NORMAL
(Buzzer does not sound.)

Approximately 4V

63

M-ASTC-ECU 
power supply

Ignition switch: ON

Battery positive voltage

81

Brake warning 
light

Engine: Idling

The warning light does not 
illuminate.

Less than 2V

The warning light illuminates.

Battery positive voltage

 

 

 

 

 

 

 

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