Mitsubishi Montero (2002-2004). Manual — part 1096

The Mitsubishi active skid and traction control sys-
tem (M-ASTC) consists of the following components;
ABS sensors, stoplight switch, hydraulic unit in
hydraulic brake booster (HBB), master cylinder pres-
sure sensor, M-ASTC-ECU, ABS rotor, steering
wheel sensor, G and yaw rate sensor, PCM, Active
skid control system operation indicator light/Active
traction control system operation indicator light,
Active skid control system OFF indicator light, 4WD

indicator light, HBB buzzer, brake system warning
light and Anti-lock braking system warning light. If a
problem occurs in the system, the malfunctioning
components can be identified and the trouble symp-
toms will be memorized by the diagnostic function.
In addition, reading of diagnostic trouble codes and
data list and actuator testing are possible by using
the Scan Tool.
The M-ASTC-ECU runs a self-check for three sec-
onds upon start-up (also ignition switch ON, engine
stopped). The anti-lock braking system warning light
should be illuminated during the self-check and turn
off when the self-check completes.

CONSTRUCTION DIAGRAM

AC204046

ACX02223

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-80

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.

ABS SENSOR

STOPLIGHT SWITCH

G AND YAW RATE SENSOR

STEERING WHEEL SENSOR

ACTIVE SKID CONTROL OFF
SWITCH

2WD/4WD DETECTION SWITCH

4LLc DETECTION SWITCH

CENTER DIFFERENTIAL LOCK
DETECTION SWITCH

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-5

• 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

M1353000900022

Retrieving M-ASTC Diagnostic Trouble Codes

Required Special Tool:

• MB991502: Scan Tool (MUT-II)

CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991502.
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 check for M-ASTC diagnostic

trouble codes.

4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991502.

Erasing M-ASTC Diagnostic Trouble Codes

Required Special Tool:

• MB991502: Scan Tool (MUT-II)

CAUTION

trouble codes.

4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991502.

ACX01539AE

MB991502

16-PIN

ACX01539AE

MB991502

16-PIN

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