Mitsubishi Montero (2004+). Manual - part 977

TRANSFER DIAGNOSIS <ACTIVE TRAC AWD II>

TSB Revision

AUTOMATIC TRANSMISSION

23A-483

STEP 1. Using scan tool MB991958, read the transfer 
diagnostic trouble code.

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) Check for transfer diagnostic trouble code.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC 34 set?

YES : Refer to 

P.23A-468

, DTC 34: Free-wheel Engage 

Solenoid Valve System.

NO :  Go to Step 2.

STEP 2. Using scan tool MB991958, check data list item 38: 
Free-wheel Engage Switch.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Transmission range should be "N" range.
(4) See scan tool MB991958 to data reading mode.

• Item 38: Free-wheel Engage Switch.

• When the transfer shift lever position is other than 

2H, the display should be "ON."

• When the transfer shift lever position is 2H, the dis-

play should be "OFF."

(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the switch operating properly?

YES : It can be assumed that this malfunction is intermittent. 

Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

− How to 

Cope with Intermittent Malfunction 

P.00-6

.

NO :  Go to Step 3.

AC307591 AC

MB991911

MB991824

MB991827

AC307591

DATA LINK

CONNECTOR

AC307591 AC

MB991911

MB991824

MB991827

AC307591

DATA LINK

CONNECTOR

TRANSFER DIAGNOSIS <ACTIVE TRAC AWD II>

TSB Revision

AUTOMATIC TRANSMISSION

23A-484

STEP 3. Using scan tool MB991958, check the free-wheel 
engage switch circuit.
(1) Remove the free-wheel engage switch.
(2) Do not disconnect connector B-39.

(3) Connect scan tool MB991958 to the data link connector.
(4) Turn the ignition switch to the "ON" position.

(5) Set scan tool MB991958 to data reading mode for item 38, 

Free-wheel Engage Switch.

• When the free-wheel engage switch is released (OFF), 

the display should be "OFF."

• When the free-wheel engage switch is pressed (ON), 

the display should be "ON."

(6) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the switch operating properly?

YES : Go to Step 4.
NO :  Go to Step 5.

STEP 4. Check the free-wheel engage solenoid valve.
Refer to GROUP 26, On-vehicle Service 

− Solenoid Valve 

Operation Check 

P.26-16

.

Q: Is the solenoid valve normal?

YES : Repair or replace the actuator assembly and 

free-wheel engage clutch. Refer to GROUP 26, 
Differential Carrier and Free-wheel Clutch 

P.26-40

.

NO :  Repair or replace the free-wheel engage solenoid 

valve and vacuum hoses. Refer to GROUP 26, 
Solenoid Valve and Vacuum Hose 

P.26-59

.

ACX02209 AC

FREE-WHEEL
ENGAGE SWITCH

ACX01539AD

MB991502

16 PIN

AC000801AC

FREE-WHEEL
ENGAGE SWITCH

B-39 HARNESS
CONNECTOR

OFF

ON

TRANSFER DIAGNOSIS <ACTIVE TRAC AWD II>

TSB Revision

AUTOMATIC TRANSMISSION

23A-485

STEP 5. Check the free-wheel engage switch.
Refer to GROUP 26, Differential Carrier and Free-wheel Clutch 

P.26-39

.

Q: Is the switch operating properly?

YES : Go to Step 6.
NO :  Replace the free-wheel engage switch. Refer to 

GROUP 26, Differential Carrier and Free-wheel 
Clutch 

P.26-37

.

STEP 6. Measure the power supply voltage at freewheel 
engage switch B-39.
(1) Disconnect connector B-39 and measure at the harness 

side.

(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal 2 and ground.

• The voltage should measure 10.5 volts.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage 10.5 volts?

YES : Go to Step 12.
NO :  Go to Step 7.

AC204168

CONNECTOR : B-39

AC

B-39 (GR)

2

1

AC204918 AF

B-39 HARNESS CONNECTOR : 
COMPONENT SIDE

1

2

TRANSFER DIAGNOSIS <ACTIVE TRAC AWD II>

TSB Revision

AUTOMATIC TRANSMISSION

23A-486

STEP 7. Measure the switch output voltage at transfer-ECU 
connector E-104 by backprobing.
(1) Do not disconnect connector E-104.
(2) Turn the ignition switch to the "ON" position.
(3) Transmission range should be "N" range.

(4) Measure the voltage between terminal 50 and ground by 

backprobing.

• When the transfer shift lever position is 2H, voltage 

should measure 10.5 volts.

• When the transfer shift lever position is other than 2H, 

voltage should measure 0 volt.

(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage within the specified range?

YES : Go to Step 10.
NO :  Go to Step 8.

AC204176

CONNECTOR : E-104

BA

51

40

3839

50

41

52

48

37

46

35

47

36

45

34

43

32

44

33

49

42

31

AC204918 BY

E-104 HARNESS CONNECTOR : 
HARNESS SIDE

51

40

3839

50

41

52

48

37

46

35

47

36

45

34

43

32

44

33

49

42

31