Mitsubishi Montero (2002-2004). Manual — part 964

DIAGNOSTIC TROUBLE CODE PROCEDURES <TRANSFER>

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DIAGNOSTIC TROUBLE CODE PROCEDURES

23Ac-339

.

CIRCUIT OPERATION
The free-wheel engage switch is turned ON when the
freewheel engage solenoid valve is activated and the
condition is shifted to the 4WD condition. The power
supply voltage is imposed to the free-wheel engage
switch from the transfer-ECU, and when the free-
wheel engage switch is turned ON, the power supply
voltage from the transfer-ECU is grounded.

.

DTC SET CONDITIONS
When the energizing condition to the free-wheel
engage solenoid valve and the condition of free-
wheel engage switch do not agree, DTC 35 is set as
the open circuit or the short circuit on the free-wheel
engage switch system.

.

TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are:)

• Malfunction of the free-wheel engage switch

• Damaged harness, connector

• Malfunction of the transfer-ECU

AC204169

CONNECTOR : B-27

AD

B-27 (B)

8

4

7

3

5

1

6

2

AC204168

CONNECTOR : B-39

AC

B-39 (GR)

2

1

AC204194

CONNECTORS : E-104, E-114

E-104

E-104

E-114

E-114

AU

51

40

3839

50

41

52

48

37

46

35

47

36

45

34

43

32

44

33

49

42

31

38

28

16

33

22

10

31

19

7

1

18

30

29

17

5

6

21

20

32

8

2

9

25

13

3

24

23

3435

1112

27

26

3637

14

4

15

DIAGNOSTIC TROUBLE CODE PROCEDURES <TRANSFER>

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DIAGNOSTIC TROUBLE CODE PROCEDURES

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DIAGNOSIS

Required Special Tool:

• MB991502: Scan Tool (MUT-II)

STEP 1. Using scan tool MB991502, read the transfer
diagnostic trouble code.

CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 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.23Ac-326

, DTC 34: Free-wheel Engage

Solenoid Valve System.

NO : Go to Step 2.

STEP 2. Using scan tool MB991502, check data list item 38:
Free-wheel Engage Switch.
(1) Connect scan tool MB991502 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 MB991502 to data reading mode for 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 display

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.

ACX01539AD

MB991502

16-PIN

ACX01539AD

MB991502

16-PIN

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STEP 3. Using scan tool MB991502, 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 MB991502 to the data link connector.
(4) Turn the ignition switch to the "ON" position.

(5) Set scan tool MB991502 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.26-37

.

NO : Repair or replace the free-wheel engage solenoid

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

P.26-57

.

ACX02209AC

FREE-WHEEL
ENGAGE SWITCH

ACX01539AD

MB991502

16-PIN

AC000801AC

FREE-WHEEL
ENGAGE SWITCH

B-39 HARNESS
CONNECTOR

OFF

ON

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

P.26-37

.

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.26-35

.

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