Mitsubishi Montero (2002-2004). Manual — part 878

TRANSFER DIAGNOSIS <ACTIVE TRAC 4WD II>

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AUTOMATIC TRANSMISSION DIAGNOSIS

23Ab-53

ACTUATOR TEST REFERENCE TABLE

M1231111400034

TRANSFER-ECU TERMINAL VOLTAGE
REFERENCE CHART FOR

M1231111500053

NOTE: Two ECUs of the same shape are situated up and down
in a row at the inner part of the floor console. The upper side
ECU is the M-ASTC-ECU. The lower side ECU is the transfer-
ECU.

MUT-II SCAN
TOOL
DISPLAY

ITEM
NO.

INSPECTION
ITEM

TEST CONTENT INSPECTION

REQUIREMENT

NORMAL CONDITION

F/W
SOLENOID

01

Freewheel
solenoid valve

Drives freewheel
solenoid valve

Ignition switch:
ON
Transmission
range: P
Engine: 0 r/min
Vehicle speed: 0
km/h (Vehicle
stop)

Freewheel engage
solenoid valve is switched
from ON to OFF, or from
OFF to ON.

SHIFT
NORMAL

02

Shift actuator

Turns shift
actuator motor to
normal direction

When the position is 2H,
4H and 4HLc, the shift
returns from that position
to original position after
shifting in the order of
2H

→4H→4HLc→4LLc.

When the position is 4LLc,
no shifting is performed.

SHIFT
REVERSE

03

Turns shift
actuator motor to
reverse direction

When the position is 2H,
4HLc and 4LLc, the shift
returns from that position
to original position after
shifting in the order of
4LLc

→4HLc→4H→2H.

When the position is 2H,
no shifting is performed.

AC205185

M-ASTC-ECU

TRANSFER-
ECU

TRANSFER-ECU SIDE CONNECTOR

AB

E-104

E-109

TRANSFER DIAGNOSIS <ACTIVE TRAC 4WD II>

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AUTOMATIC TRANSMISSION DIAGNOSIS

23Ab-54

TERMINAL
NO.

INSPECTION ITEMS

INSPECTION REQUIREMENT

NORMAL CONDITION

1

Shift actuator voltage

Ignition switch: ON
Transmission range:
N

Transfer shift lever
position: 2H

→ 4H

or 4H

→ 4HLc or

4HLc

→ 4LLc

1/2 Battery voltage

→

Battery voltage

→ 1 V or

less

→ 1/2 Battery

voltage

Transfer shift lever
position: 4LLc

→

4HLc or 4HLc

→

4H or 4H

→ 2H

1/2 Battery voltage

→ 1 V

or less

→ 1/2 Battery

voltage

3

Shift actuator voltage

Ignition switch: ON
Transmission range:
N

Transfer shift lever
position: 2H

→ 4H

or 4H

→ 4HLc or

4HLc

→ 4LLc

1/2 Battery voltage

→ 1 V

or less

→ 1/2 Battery

voltage

Transfer shift lever
position: 4LLc

→

4HLc or 4HLc

→

4H or 4H

→ 2H

1/2 Battery voltage

→

Battery voltage

→ 1 V or

less

→ 1/2 Battery

voltage

5

Accelerator pedal
position sensor

Ignition switch: ON
Engine: Stopped
Transmission range:
P

Accelerator pedal:
Fully closed

0.905

− 1.165 V

Accelerator pedal:
Fully open

4.035 V or more

6

M-ASTC-ECU signal
(FR)

Ignition switch: ON

1 V or less

7

Front propeller shaft
speed sensor

Measure between terminals 7 and 18
with an oscilloscope.
Engine: 2,000 r/min
Gear range: 3rd gear
Transfer position: 4HLc

Refer to

P.23Ab-42

,

Inspection Procedure
Using an Oscilloscope.

8

M-ASTC-ECU signal
(RL)

Ignition switch: ON

1 V or less

9

Rear propeller shaft
speed sensor

Measure between terminals 9 and 18
with an oscilloscope.
Engine: 2,000 r/min
Gear range: 3rd gear
Transfer position: 4HLc

Refer to

P.23Ab-42

,

Inspection Procedure
Using an Oscilloscope.

10

M-ASTC-ECU signal
(RR)

Ignition switch: ON

1 V or less

13

ECU power supply

Ignition switch: OFF

0 V

Ignition switch: ON

Battery positive voltage

18

Sensor ground

Always

1 V or less

19

M-ASTC-ECU signal
(FL)

Ignition switch: ON

1 V or less

TRANSFER DIAGNOSIS <ACTIVE TRAC 4WD II>

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AUTOMATIC TRANSMISSION DIAGNOSIS

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20

Transfer shift lever
switch: 2H

Ignition switch: ON
Transmission range:
N

Transfer shift lever
position: 2H

Battery positive voltage

Transfer shift lever
position: Other
than 2H

0 V

21

Transfer shift lever
switch: 4H

Ignition switch: ON
Transmission range:
N

Transfer shift lever
position: 4H

Battery positive voltage

Transfer shift lever
position: Other
than 4H

0 V

22

Transfer shift lever
switch: 4HLc

Ignition switch: ON
Transmission range:
N

Transfer shift lever
position: 4HLc

Battery positive voltage

Transfer shift lever
position: Other
than 4HLc

0 V

23

Transfer shift lever
switch: 4LLc

Ignition switch: ON
Transmission range:
N

Transfer shift lever
position: 4LLc

Battery positive voltage

Transfer shift lever
position: Other
than 4LLc

0 V

25

Ground

Always

1 V or less

26

Ground

Always

1 V or less

31

Back-up power supply

Always

Battery positive voltage

32

Transmission range
switch: N

Ignition switch: ON

Transmission
range: N

Battery positive voltage

Transmission
range: Other than
N

0 V

34

Stoplight switch

Ignition switch: ON

Brake pedal:
Depressed

Battery positive voltage

Brake pedal:
Released

0 V

35

Ground

Always

1 V or less

37

2WD indicator light
(RL)

Ignition switch: ON
Transmission range:
N

Transfer shift lever
position: 4HLc

⇔

4LLc

Battery positive voltage
⇔ 1 V or less → battery

positive voltage

Transfer shift lever
position: 2H

⇔ 4H

⇔ 4HLc

Battery positive voltage

TERMINAL
NO.

INSPECTION ITEMS

INSPECTION REQUIREMENT

NORMAL CONDITION

TRANSFER DIAGNOSIS <ACTIVE TRAC 4WD II>

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AUTOMATIC TRANSMISSION DIAGNOSIS

23Ab-56

38

4WD indicator light (FL) Ignition switch: ON

Transmission range:
N

Transfer shift lever
position: 2H

1V or less

Transfer shift lever
position: Other
than 2H

1 V or less

⇔ battery

positive voltage

39

Ground

Always

1 V or less

40

Center differential lock
indicator light

Ignition switch: ON
Transmission range:
N

Transfer shift lever
position: 2H, 4H

Battery positive voltage

Transfer shift lever
position: 4HLc,
4LLc

1 V or less

41

Free-wheel engage
solenoid valve

Ignition switch: ON
Transmission range:
N

Transfer shift lever
position: 2H

1 V or less

Transfer shift lever
position: Other
than 2H

Battery positive voltage

42

Ground

Always

1 V or less

43

2WD detection switch

Ignition switch: ON
Transmission range:
N

Transfer shift lever
position: 2H

1 V or less

Ignition switch: ON
Transmission range:
N

Transfer shift lever
position: Other
than 2H

Battery positive voltage

44

2WD/4WD detection
switch

Ignition switch: ON
Transmission range:
N

Transfer shift lever
position: 2H, 4H

1 V or less

Transfer shift lever
position: 4HLc,
4LLc

Battery positive voltage

45

4H detection switch

Ignition switch: ON
Transmission range:
N

Transfer shift lever
position: 4H, 4HLc

1 V or less

Transfer shift lever
position: 2H, 4LLc

Battery positive voltage

46

Center differential lock
detection switch

Ignition switch: ON
Transmission range:
N

Transfer shift lever
position: 4HLc,
4LLc

1 V or less

Transfer shift lever
position: 2H, 4H

Battery positive voltage

47

4LLc detection switch

Ignition switch: ON
Transmission range:
N

Transfer shift lever
position: 4LLc

1 V or less

Transfer shift lever
position: Other
than 4LLc

Battery positive voltage

TERMINAL
NO.

INSPECTION ITEMS

INSPECTION REQUIREMENT

NORMAL CONDITION