Mitsubishi Montero (2004+). Manual — part 956

TRANSFER DIAGNOSIS <ACTIVE TRAC AWD II>

TSB Revision

AUTOMATIC TRANSMISSION

23A-399

HOW TO PERFORM ACTUATOR TEST

Required Special Tools:

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

• MB991824: 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 "SS4II" from the "POWER TRAIN" tab.
6. Select "MITSUBISHI."
7. Select "Actuator Test."
8. Choose an appropriate item and select the "OK" button.

FAIL-SAFE/BACKUP FUNCTIONS

M1231111000058

When malfunctions of the main sensors or actuators
are detected by the transfer-ECU, the transfer is con-
trolled by pre-set control logic to maintain safe condi-
tions for driving.

The following table shows how the fail-safe/backup
function affects vehicle driveability and operation.

AC307591 AC

MB991911

MB991824

MB991827

AC307591

DATA LINK

CONNECTOR

MALFUNCTIONING ITEM

JUDGMENT CONDITION

CONTROL CONTENTS DURING
MALFUNCTION

Power supply voltage

Power supply voltage is 9.5 V and less. Control start prohibited
Power supply voltage is 18 V and over. Control stop

Main relay (inside of ECU)

Voltage at relay OFF is 6 V and over, or
voltage at relay ON is 6 V and less.

Control stop

Accelerator pedal position
(APP) sensor

APP sensor voltage at idle condition is
less than 0.2 V.

Vehicle speed limitation

Front propeller shaft speed
sensor 1

Input signal from front propeller shaft
speed sensor is unstable during low
and medium speed driving. (When
malfunction is detected during 2WD

→

4WD shifting)

Control start prohibited

TRANSFER DIAGNOSIS <ACTIVE TRAC AWD II>

TSB Revision

AUTOMATIC TRANSMISSION

23A-400

Front propeller shaft speed
sensor 2

Input signal from front propeller shaft
speed sensor is unstable at freewheel
engage switch ON condition. (When
malfunction is detected at 4WD
condition)

Control start prohibited

Rear propeller shaft speed
sensor 1

Input signal from rear propeller shaft
speed sensor is unstable when APP
sensor voltage is 1.5 V and over. (When
malfunction is detected at 2WD and
4WD conditions)

Control start prohibited

Rear propeller shaft speed
sensor 2

Input signal from rear propeller shaft
speed sensor is unstable when
freewheel engage switch is ON
condition. (When malfunction is
detected at 4WD condition)

Control start prohibited

Stoplight switch

Stoplight switch ON was detected for 15
minutes at vehicle speed of 15 km/h
and over.

Control continued

Transfer shift lever switch

Input signal from transfer shift lever
switch is unstable.

Control start prohibited

Transfer position switch 1

Shifting of transfer has not been
completed during driving.

Control prohibited

Transfer position switch 2

Input signals from detection switches
are unstable.

Control prohibited

Freewheel engage solenoid
valve

Energizing condition to solenoid valve
and ECU terminal voltage do not
accord.

Control start prohibited

Freewheel engage switch

Energizing condition to solenoid valve
and freewheel engage switch condition
do not accord.

Control prohibited

Shift actuator abnormality

ECU terminal voltage is more than main
relay voltage (90% of specified voltage)
or lower than main relay voltage (10%
of specified voltage).

Control stop

Shift actuator short-circuited

Actual value of actuator current is more
than target value +1A.

Control stop

Shift actuator open-circuited

Main relay voltage is 6V and over or
actual value of actuator current is less
than 0.1 A.

Control stop

Shift actuator overload

Accumulation time to drive actuator
exceeds 5 minutes.

Control stop

Dissimilar tire diameter

Speed difference between front wheel
and rear wheel at 4WD condition is
larger than set value.

Vehicle speed limitation

M-ASTC-ECU malfunction

Open circuit in all signal lies with the
M-ASTC-ECU

Control continued

Transfer-ECU malfunction

Malfunction of ECU was detected.

Control stop

MALFUNCTIONING ITEM

JUDGMENT CONDITION

CONTROL CONTENTS DURING
MALFUNCTION

TRANSFER DIAGNOSIS <ACTIVE TRAC AWD II>

TSB Revision

AUTOMATIC TRANSMISSION

23A-401

DIAGNOSTIC TROUBLE CODE CHART

M1231111100066

CODE

DIAGNOSIS ITEM

REFERENCE PAGE

11

Power supply voltage system

Low voltage

P.23A-402

12

Over voltage

P.23A-402

13

Main relay system (inside of ECU)

Relay malfunction

P.23A-408

21

Accelerator pedal position (APP) sensor system Open-circuit/sensor

malfunction

P.23A-409

22

Front propeller shaft speed sensor system

Open-circuit/short-
circuit/sensor
malfunction

P.23A-415

23

P.23A-415

24

Rear propeller shaft speed sensor system

Open-circuit/short-
circuit/sensor
malfunction

P.23A-427

25

P.23A-427

26

Stoplight switch system

Open-circuit/short-
circuit/lamp
failure/switch failure

P.23A-439

31

Transfer shift lever switch system

Open-circuit/short-
circuit/switch failure

P.23A-448

32

Transfer position switch system

Transfer shift
mechanism
malfunction/actuator
malfunction

P.23A-457

33

Transfer position switch system

Open-circuit/short-
circuit/switch failure

P.23A-457

34

Free-wheel engage solenoid valve system

Open-circuit/short-
circuit/solenoid valve
malfunction

P.23A-468

35

Free-wheel engage switch system

Open-circuit/short-
circuit/switch failure

P.23A-481

41

Shift actuator system (short-circuit, open-circuit) Open-circuit/short-

circuit/actuator
malfunction/ECU
malfunction

P.23A-492

42

Shift actuator system (short-circuit)

Short-circuit/actuator
malfunction/ECU
malfunction

P.23A-499

43

Shift actuator system (open-circuit)

Open-circuit/actuator
malfunction/ECU
malfunction

P.23A-499

44

Shift actuator system (Overload)

Transfer shift
mechanism
malfunction/actuator
malfunction

P.23A-505

TRANSFER DIAGNOSIS <ACTIVE TRAC AWD II>

TSB Revision

AUTOMATIC TRANSMISSION

23A-402

DIAGNOSTIC TROUBLE CODE PROCEDURES <TRANSFER>

DTC.11, 12: Power Supply Voltage System

45

Dissimilar tire diameter

Incorrect tire
pressure/dissimilar
tire size

P.23A-511

51

Transfer-ECU malfunction

Replace the
transfer-ECU

61

M-ASTC-ECU malfunction

Open-circuit/short-
circuit/ECU
malfunction

P.23A-512

CODE

DIAGNOSIS ITEM

REFERENCE PAGE

ACX02030AB

Power Supply System Circuit

AC204170

CONNECTOR : D-01

CD

9 10

8

6 7

31 32

30

29

18 19 20 21

5

4

2

1

3

27

26

24

23

25

12 13 14 15 16 17

28

11
22
33