Mitsubishi Montero (2002-2004). Manual - part 956

DIAGNOSTIC TROUBLE CODE PROCEDURES <TRANSFER>

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

23Ac-307

DTC 31: Tansfer Shift Lever Switch System

ACX02035AB

Transfer Shift Lever Switch 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

DIAGNOSTIC TROUBLE CODE PROCEDURES <TRANSFER>

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

23Ac-308

.

CIRCUIT OPERATION

• Battery positive voltage is applied to the transfer 

shift lever switch (terminal 1) when the ignition 
switch is turned "ON."

• Battery positive voltage is applied to the transfer-

ECU terminal 20, 21, 22, or 23 when the transfer 
shift lever is in the "2H," "4H," "4HLc" or "4LLc." 
The transfer-ECU judges that the transfer shift 
lever is in the "2H," "4H," "4HLc" or "4LLc" when 
the battery positive voltage is applied.

.

DTC SET CONDITIONS
In the case that the input signal from the transfer shift 
lever switch is open or shorted, the DTC 31 is set as 
the open circuit or the short circuit of the transfer shift 
lever switch system.

.

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

• Malfunction of the transfer shift lever switch

• Malfunction of the ignition switch

• Damaged harness, connector

• Malfunction of the transfer-ECU

AC204191

CONNECTORS : D-208, D-212

5 6

2

4

3

1

JUNCTION BLOCK
(FRONT VIEW)

3

10

9

4

11

8

7

1

5

2

6

D-208

D-208

D-212

D-212

AS

AC204194

CONNECTORS : E-11, E-109

E-109

E-109

E-11

E-11

AW

3

10

16

9

7 8

6

1

4

2

5

11

14

1213

15

11 12

25

24

13

26

9

22

7

6

20

19

8

21

10

23

5

4

17

2

1

15

14

3

16

18

AC204175

CONNECTOR : E-116

AH

6

2

5

4

3

1

DIAGNOSTIC TROUBLE CODE PROCEDURES <TRANSFER>

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

23Ac-309

DIAGNOSIS

Required Special Tool:

• MB991502: Scan Tool (MUT-II)

STEP 1. Using scan tool MB991502, check data list item 06: 
Transfer Shift Lever Position.

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) Set scan tool MB991502 to data reading mode for item 06, 

Transfer Shift Lever Position.

• Display should be the same as the actual transfer shift 

lever position.

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

YES : If 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 2.

STEP 2. Check the transfer shift lever switch.
Check for resistance between terminals for each transfer shift 
lever position.

Q: Is switch operating properly?

YES : Go to Step 3.
NO :  Replace the transfer shift lever switch. Refer to, 

Transmission Control 

P.23Aa-37

.

ACX01539AD

MB991502

16-PIN

TRANSFER SHIFT 
LEVER POSITION

TERMINAL 
NUMBER

SPECIFIED 
CONDITION

2H

1 

− 3

Less than 2 ohms.

4H

1 

− 5

4HLc

1 

− 6

4LLc

1 

− 2

ACX01331AB

4LLc

4HLc

4H

2H

DIAGNOSTIC TROUBLE CODE PROCEDURES <TRANSFER>

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

23Ac-310

STEP 3. Measure the power supply voltage at transfer shift 
lever switch connector E-116.
(1) Disconnect connector E-116 and measure at harness side.
(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal 1 and ground.

• The voltage should measure battery positive voltage.

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

YES : Go to Step 6.
NO :  Go to Step 4.

AC204175

CONNECTOR : E-116

AH

6

2

5

4

3

1

AC204918 CI

E-116 HARNESS CONNECTOR : 
COMPONENT SIDE

3

1

4

5

6

2