Mitsubishi Montero (2004+). Manual - part 1073

 

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Mitsubishi Montero (2004+). Manual - part 1073

 

 

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-3

System Check Sound

When starting the engine, a thudding sound can 
sometimes be heard coming from the engine com-
partment. This is a normal sound during the Active 
skid control system self-check.

Active Skid Control System Operation 
Sounds and Sensations 

During normal operation, the Active skid control sys-
tem makes several sounds that may seem unusual 
at first:

• A whining sound is caused by the ABS hydraulic 

unit motor.

• When pressure is applied to the brake pedal, the 

pulsation of the pedal causes a scraping sound.

M-ASTC DIAGNOSIS

INTRODUCTION TO MITUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM 
DIAGNOSIS

M1353002700024

The M-ASTC system controls the vehicle by braking 
force and engine output. If any maladjustment or 
trouble related to these elements is present, its per-
formance may be deteriorated.

TROUBLESHOOTING STRATEGY

M1353000800025

Use these steps to plan your diagnostic strategy. If 
you follow them carefully, you will be sure that you 
have exhausted most of the possible ways to find an 
M-ASTC fault.
1. Gather information about the problem from the 

customer.

2. Verify that the condition described by the 

customer exists.

3. Check the vehicle for any M-ASTC DTC.
4. If you cannot verify the condition and there are no 

M-ASTC DTCs, the malfunction is intermittent. 
Refer to GROUP 00, How to use 
Troubleshooting/Inspection Service Points 

− How 

to Cope with Intermittent Malfunctions 

P.00-6

.

5. If you can verify the condition but there are no 

M-ASTC DTCs, or the system cannot 
communicate with the scan tool, check that the 
basic brake system is operating properly.

• If the basic brake system is not operating prop-

erly, refer to the GROUP 35A, Basic Brake Sys-
tem Diagnosis

P.35A-6

.

• If the basic brake system is operating properly, 

refer to 

P.35B-85

.

6. If there is an M-ASTC DTC, record the number of 

the DTC, then erase the DTC from the memory 
using the scan tool.

7. Duplicate the M-ASTC DTC set conditions to see 

if the same M-ASTC DTC will set again.

1.

ABS SENSOR

2.

STOPLIGHT SWITCH

3.

G AND YAW RATE SENSOR

4.

STEERING WHEEL SENSOR

5.

ACTIVE SKID CONTROL OFF 
SWITCH

6.

2WD/4WD DETECTION SWITCH

7.

4LLc DETECTION SWITCH

8.

CENTER DIFFERENTIAL LOCK 
DETECTION SWITCH

9.

2WD DETECTION SWITCH

10. 4H DETECTION SWITCH
11. MASTER CYLINDER PRESSURE 

SENSOR

12. HYDRAULIC UNIT IN HYDRAULIC 

BRAKE BOOSTER (HBB)

13. VALVE RELAY

14. HBB BUZZER
15. ACTIVE SKID CONTROL SYSTEM 

OPERATION INDICATOR 
LIGHT/ACTIVE TRACTION 
CONTROL SYSTEM OPERATION 
INDICATOR LIGHT

16. ACTIVE SKID CONTROL SYSTEM 

OFF INDICATOR LIGHT

17. 4WD INDICATOR LIGHT
18. DATA LINK CONNECTOR
19. POWER CONTROL MODULE 

(PCM)

20. MITUBISHI ACTIVE SKID AND 

ACTIVE TRACTION CONTROL 
UNIT(M-ASTC-ECU)

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-4

• If the same M-ASTC DTC sets again, perform the 

diagnostic procedures for the DTC. Refer to 

P.35B-8

.

• If you cannot get the same M-ASTC DTC to set 

again, the malfunction is intermittent. Refer to 
GROUP 00, How to use Troubleshooting/Inspec-
tion Service Points 

− How to Cope with Intermit-

tent Malfunctions

P.00-6

.

TROUBLE CODE DIAGNOSIS

M1353000900033

Retrieving M-ASTC Diagnostic Trouble Codes

.

Required Special Tools:

•  MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: MUT-III USB Cable

• MB991911: MUT-III Main Harness B

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. Ensure that the ignition switch is at the "LOCK" (OFF) 

position.

2. Start up the personal computer.
3. Connect special tool MB991827 to special tool MB991824 

and the personal computer.

4. Connect special tool MB991911 to special tool MB991824.
5. Connect special tool MB991911 to the data link connector.
6. Turn the power switch of special tool MB991824 to the "ON" 

position.
NOTE: When special tool MB991824 is energized, special 
tool MB991824 indicator light will be illuminated in a green 
color.

7. Start the MUT-III system on the personal computer.
NOTE: Disconnecting scan tool MB991958 is the reverse of the 
connecting sequence, making sure that the ignition switch is at 
the "LOCK" (OFF) position.

Erasing M-ASTC Diagnostic Trouble Codes

.

Required Special Tools:

•  MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: MUT-III USB Cable

• MB991911: MUT-III Main Harness B

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.

NOTE: If the battery voltage is low, diagnostic trouble codes 
will not be set. Check the battery if scan tool MB991958 
does not display.

AC307591 AC

MB991911

MB991824

MB991827

AC307591

DATA LINK

CONNECTOR

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-5

1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Select "Interactive Diagnosis" from the start-up screen.
4. Select "System select."
5. Choose "ABS/ASC/ASTC" from the "CHASSIS" tab.
6. Select "MITSUBISHI."
7. Select "Diagnostic Trouble Code."
8. If a DTC is set, it is shown.
9. Choose "Erase DTCs" to erase the DTC.

HOW TO READ DATA LIST

Required Special Tools:

•  MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: MUT-III USB Cable

• MB991911: MUT-III Main Harness B

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. Select "Interactive Diagnosis" from the start-up screen.
4. Select "System select."
5. Choose "ABS/ASC/ASTC" from the "CHASSIS" tab.
6. Select "MITSUBISHI."
7. Select "Data List."
8. Choose an appropriate item and select the "OK" button.

AC307591 AC

MB991911

MB991824

MB991827

AC307591

DATA LINK

CONNECTOR

AC307591 AC

MB991911

MB991824

MB991827

AC307591

DATA LINK

CONNECTOR

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-6

HOW TO PERFORM ACTUATOR TEST

Required Special Tools:

•  MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: MUT-III USB Cable

• MB991911: MUT-III Main Harness B

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. Select "Interactive Diagnosis" from the start-up screen.
4. Select "System select."
5. Choose "ABS/ASC/ASTC" from the "CHASSIS" tab.
6. Select "MITSUBISHI."
7. Select "Actuator Test."
8. Choose an appropriate item and select the "OK" button.

AC307591 AC

MB991911

MB991824

MB991827

AC307591

DATA LINK

CONNECTOR

 

 

 

 

 

 

 

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