Mitsubishi Montero (2002-2004). Manual - part 903

DIAGNOSTIC TROUBLE CODE PROCEDURES <AUTOMATIC TRANSMISSION>

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

23Ac-95

.

CIRCUIT OPERATION

• Battery positive voltage is applied to the transmis-

sion range switch (terminal 7) when the ignition 
switch is turned "ON."

• Battery positive voltage is applied to the PCM 

(terminal 66) when the selector lever is in the "P" 
range. The PCM judges that the selector lever is 
in the "P" range when the battery positive voltage 
is applied.

• Battery positive voltage is applied to the PCM ter-

minal 67 (75 or 76) when the selector lever is in 
the "R" range ("N" or "D" range). The PCM judges 
that the selector lever is in the "R" range ("N" or 
"D" range) when the battery positive voltage is 
applied.

.

DTC SET CONDITIONS
If the PCM detects no Transmission Range switch 
input signal from any selector position for a continu-
ous period of thirty seconds or more, it is judged that 
there is an open circuit in the transmission range 
switch and DTC 27 is set.

.

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

• Malfunction of the transmission range switch

• Malfunction of the ignition switch

• Damaged harness, connector

• Malfunction of the PCM

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

E-113

E-113

E-11

E-11

BE

E-115

E-115

E-114

E-111, E-114

3

10

16

9

7 8

6

1

4

2

5

11

14

1213

15

1

6

2

7 8 9 10 11 12 13 14

3 4 5

E-111

CONNECTORS : E-11, E-111, E-113, E-114, 
                             E-115

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

8

3

4 5

1

2

6 7

DIAGNOSTIC TROUBLE CODE PROCEDURES <AUTOMATIC TRANSMISSION>

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

23Ac-96

DIAGNOSIS

Required Special Tool:

• MB991502: Scan Tool (MUT-II)

STEP 1. Using scan tool MB991502, check data list item 61: 
Transmission Range Switch.

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 61, 

Transmission Range Switch.

• Move the selector lever to "P," "R," "N," "D" and sport 

mode positions and confirm that the selected transmis-
sion ranges match the positions shown on scan tool 
MB991502. (Sport mode is indicated as "D" on scan tool 
MB991502.)

(4) 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 :  When the transmission range does not match any of 

the positions shown on scan tool MB991502: Go to 
Step 2. When the transmission range does not match 
the "P" position on scan tool MB991502: Go to Step 6. 
When the transmission range does not match the "R" 
position on scan tool MB991502: Go to Step 14 . 
When the transmission range does not match the "N" 
position on scan tool MB991502: Go to Step 21. 
When the transmission range does not match the "D" 
position on scan tool MB991502: Go to Step 28. 
When the transmission range does not match the 
sport mode position on scan tool MB991502 (agrees 
at "D" position): Go to Step 36.

ACX01539AD

MB991502

16-PIN

DIAGNOSTIC TROUBLE CODE PROCEDURES <AUTOMATIC TRANSMISSION>

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

23Ac-97

STEP 2. Check the transmission range switch.
Measure the resistance between the terminals for each selec-
tor position as indicated in the table above

Q: Does the resistance measure less than 2 ohms for each 

selector position?
YES : Go to Step 3.
NO :  Replace the transmission range switch. Refer to 

GROUP 23B, Transmission 

P.23B-18

.

TRANSMISSION 
RANGE

TERMINAL 
CONNECTION OF 
TESTER

SPECIFIED 
CONDITION

P

1 

− 7

Less than 2 ohms.

R

7 

− 8

N

2 

− 7

D

3 

− 7

ACX01187AD

P

R

N

D

DIAGNOSTIC TROUBLE CODE PROCEDURES <AUTOMATIC TRANSMISSION>

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

23Ac-98

STEP 3. Check transmission range switch connector C-04, 
joint connector D-01, junction block connector D-212 and 
intermediate connector E-11 for loose, corroded or 
damaged terminals, or terminals pushed back in the 
connector.
Q: Are the connectors and terminals in good condition?

YES : Go to Step 4.
NO :  Repair or replace the damaged components. Refer to 

GROUP 00E, Harness Connector Inspection 

P.00E-

2

.

AC204395

CONNECTOR : C-04

AF

C-04 (B)

4
9

5

10

3
8

2
7

6

1

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

AC204173

CONNECTOR : D-212

AZ

3

10

9

4

11

8

7

1

5

2

6

JUNCTION BLOCK
(FRONT VIEW)

AC204176

CONNECTOR : E-11

AZ

3

10

16

9

7 8

6

1

4

2

5

11

14

1213

15