Mitsubishi Montero (2002-2004). Manual - part 1146

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-201

CHECK AT M-ASTC-ECU

M1353001400020

The M-ASTC-ECU also controls the ABS system. 
For the terminal voltage reference table, refer to 
GROUP 35B, Check at M-ASTC-ECU 

P.35B-115

.

AC205660

ON

OFF

ON

OFF

ON

OFF

3s

ITEM No. 05 - 08 DRIVE PATTERN

CONTROL SOLENOID 
VALVE IN

CONTROL SOLENOID 
VALVE OUT

SELECT SOLENOID 
VALVE
(SA1, SA2, SA3, STR)

CORRESPONDING 
WHEEL BRAKE PRESSURE

HOLD

AB

SPECIAL TOOLS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-202

SPECIAL TOOLS

M1353000600021

TOOL

TOOL NUMBER AND 
NAME

SUPERSESSION

APPLICATION

MB991502
Scan tool (MUT-II)

MB991496-OD

For checking of Active 
skid control system 
[Diagnostic trouble code 
display when using the 
scan tool (MUT-II)]

MB991348
Test harness set

MB991496-OD

For checking of G and 
yaw rate sensor

MB991223
Harness set
A:MB991219
Inspection harness

MB991223
MB991709-01

ABS sensor output 
voltage measurement

B991502

MB991348

MB991223

A

AB

B

C

D

ON-VEHICLE SERVICE

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-203

ON-VEHICLE SERVICE

ABS SENSOR OUTPUT VOLTAGE CHECK

M1353004700019

Refer to GROUP 35B, On-Vehicle service 

P.35B-119

SOLENOID VALVE CHECK

M1353001700021

Measure the resistance between the following solenoid valve 
terminals.

• Control solenoid valve IN (FR): Between terminals (19) − 

(34) 

• Control solenoid valve OUT (FR): Between terminals (20) − 

(34) 

• Control solenoid valve IN (FL): Between terminals (21) − 

(34)

• Control solenoid valve OUT (FL): Between terminals (22) − 

(34)

• Control solenoid valve IN (RR): Between terminals (15) − 

(34) 

• Control solenoid valve OUT (RR): Between terminals (16) − 

(34) 

• Control solenoid valve IN (RL): Between terminals (13) − 

(34) 

• Control solenoid valve OUT (RL): Between terminals (14) − 

(34)

• Select solenoid valve (SA1): Between terminals (18) − (34)

• Select solenoid valve (SA2): Between terminals (17) − (34)

• Select solenoid valve (SA3): Between terminals (12) − (34)

• Select solenoid valve (STR): Between terminals (11) − (34)

Standard value: 
Control solenoid valve IN: 4.75 

− 5.25 Ω 

Control solenoid valve OUT: 2.0 

− 2.4 Ω 

Select solenoid valve: 3.5 

− 3.9 Ω

IN THE EVENT OF A DISCHARGED BATTERY

M1353004900013

WARNING

If the ABS is not operating, the vehicle posture will be 
unstable during braking. Do not drive the vehicle with 
the M-ASTC-ECU connector disconnected or with the 
ABS not operating.

If the engine is started using a booster cable when the battery 
is completely flat, and the vehicle is then driven without waiting 
for the battery to be recharged, the engine may misfire and it 
may not be possible to drive the vehicle. This is because the 
ABS consumes a large amount of current when carrying out its 
initial checks. If this happens, recharge the battery fully.

ACX01116 AB

ON-VEHICLE SERVICE

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-204

Initializing the M-ASTC-ECU (Action to be taken 
when the battery is removed

)

When the battery is removed, the neutral point of the steering 
wheel sensor will be erased, the Active skid control system 
OFF indicator light will illuminates and DTC 83 (ST NO ADJ) 
will be set. In this case, make the steering wheel sensor learn 
the neutral point by following one of the procedures below.

Using scan tool MB991502

1. Connect scan tool MB991502 to the data link connector.

2. Turn the ignition switch to the "ON" position.
3. Turn the steering wheel 8

°or more, and then return it to the 

neutral (straight forward) position.

4. Execute item No.14 "ST SNSR: 0 " on the Actuator test.
5. Ensure that the Active skid control system OFF indicator 

light is off.

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

Not using scan tool MB991502

CAUTION

1. If a different diameter or size of tires are equipped, the M-

ASTC-ECU may not learn the neutral position.

Turn the steering wheel 8

°or more, and then return the 

steering wheel to straight-ahead position.

2. Drive the vehicle straight forward at 35 km/h (25 mph) for 

approximately one second.

3. Ensure that the Active skid control system OFF indicator 

light is off.

ACX01539AE

MB991502

16-PIN