Mitsubishi Montero (2004+). Manual - part 1125

ON-VEHICLE SERVICE

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-211

ON-VEHICLE SERVICE

ABS SENSOR OUTPUT VOLTAGE CHECK

M1353004700020

Refer to GROUP 35B, On-Vehicle service 

P.35B-124

SOLENOID VALVE CHECK

M1353001700032

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)

MB991223
Harness set
A:MB991219
Inspection harness

MB991223
MB991709-01

ABS sensor output 
voltage measurement

TOOL

TOOL NUMBER AND 
NAME

SUPERSESSION

APPLICATION

MB991223

A

AB

B

C

D

ACX01116 AB

ON-VEHICLE SERVICE

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-212

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

M1353004900024

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.

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 MB991958

1. Connect scan tool MB991958 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 MB991958.

Not using scan tool MB991958

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.

AC307591 AB

MB991911

DATA LINK

CONNECTOR

MB991824

MB991827

M-ASTC CONTROL UNIT (M-ASTC-ECU)

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-213

M-ASTC CONTROL UNIT (M-ASTC-ECU)

REMOVAL AND INSTALLATION

M1353002500031

INSTALLATION SERVICE POINTS

.

>>A<< M-ASTC-ECU INITIALIZATION

CAUTION

Perform the following initialization procedure, otherwise 
the following DTCs will be set.

• DTC No.81: G NO ADJ
• DTC No.84: TF NO CHECK
• DTC No.85: M/CYL PRS NO CHECK

NOTE: The SS4 indicator is flashing while the scan tool is con-
nected.
When installing a new M-ASTC-ECU, perform the initialization 
as follows, ensuring that the vehicle remains level.
1. Place the selector lever in the "P" position.

Pre-removal and Post-installation Operation
• Indicator Panel, Lower Center Panel Removal and instal-

lation (Refer to GROUP 52A, Floor Console 

P.52A-7

).

AC204232

5.0 ± 1.0 N·m
44 ± 9 in-lb

1

3

AB

2

REMOVAL STEPS

>>B<<

• CANCELLING THE HBB BUZZER 

OPERATION CHECK MODE (WHEN 
REPLACING THE ABS-ECU)

1. M-ASTC-ECU CONNECTOR

2. GROUND

>>A<<

3. M-ASTC-ECU

REMOVAL STEPS (Continued)

ABS SENSOR

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-214

2. Connect scan tool MB991958 to the data link connector.
3. Turn the ignition switch to the "ON" position.
4. Execute item No.16 "G SNSR: " on the Actuator test.
5. Depress the brake pedal by a pressure of approximately 40 

kg quickly once.

6. Place the shift lever to the N range.

CAUTION

If the transfer is not engaged properly when the transfer 
lever is moved to each position, the initialization has not 
been completed successfully.
7. Move the transfer lever through all positions (2H, 4H, 4HLc, 

4LLc).

CAUTION

The initialization has not been completed while the ASC 
OFF indicator is illuminating and the ASC indicator is 
flashing.The system does not recognize the transfer posi-
tion correctly. Make the system recognize it again.
8. Ensure that the ASC OFF indicator and the ASC indicator 

are off.

9. Turn the ignition switch to the "LOCK" (OFF) position.
10.Disconnect scan tool MB991958.

.

>>B<< CANCELLING THE HBB BUZZER OPERATION 
CHECK MODE (WHEN REPLACING THE ASTC-ECU)
If the ignition switch is turned to the "ON" position after replac-
ing the M-ASTC-ECU, the HBB buzzer will sound for approxi-
mately five seconds. This is because the M-ASTC-ECU is at 
the HBB buzzer operation check mode (for factory production 
line). To stop the tone alarm, carry out one of the following pro-
cedures.

• Erase HBB diagnostic trouble codes by using scan tool 

MB991958 or special tool MB991529. Refer to GROUP 
35A, HBB Trouble Code Diagnosis 

P.35A-13

.

• Drive the vehicle at 40 km/h (25 mph) or more.

ABS SENSOR

REMOVAL AND INSTALLATION

M1354004300014

Refer to GROUP 35B, ABS sensor 

P.35B-129

.

AC307591 AB

MB991911

DATA LINK

CONNECTOR

MB991824

MB991827