Mitsubishi Montero (2004+). Manual - part 987

TRANSFER-ECU TERMINAL VOLTAGE REFERENCE CHART FOR

TSB Revision

AUTOMATIC TRANSMISSION

23A-523

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.23A-395

, 

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.23A-395

, 

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

TERMINAL 
NO.

INSPECTION ITEMS

INSPECTION REQUIREMENT

NORMAL CONDITION

TRANSFER-ECU TERMINAL VOLTAGE REFERENCE CHART FOR

TSB Revision

AUTOMATIC TRANSMISSION

23A-524

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

TERMINAL 
NO.

INSPECTION ITEMS

INSPECTION REQUIREMENT

NORMAL CONDITION

TRANSFER-ECU TERMINAL VOLTAGE REFERENCE CHART FOR

TSB Revision

AUTOMATIC TRANSMISSION

23A-525

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

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

TERMINAL 
NO.

INSPECTION ITEMS

INSPECTION REQUIREMENT

NORMAL CONDITION

TRANSFER-ECU TERMINAL VOLTAGE REFERENCE CHART FOR

TSB Revision

AUTOMATIC TRANSMISSION

23A-526

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

48

2WD indicator light 
(RR)

• 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

49

4WD indicator light 
(FR)

• Ignition switch: 

ON

• Transmission 

range: N

Transfer shift lever 
position: 2H

1 V or less

Transfer shift lever 
position: Other 
than 2H

1 V or less 

⇔ battery 

positive voltage

50

Free-wheel engage 
switch

• Engine: Idling

• Transmission 

range: N

• 4WD indicator 

light: Should not 
be flashing

Transfer shift lever 
position: 2H

Battery positive voltage

Transfer shift lever 
position: Other 
than 2H

1 V or less

TERMINAL 
NO.

INSPECTION ITEMS

INSPECTION REQUIREMENT

NORMAL CONDITION