Mitsubishi Montero (2002-2004). Manual - part 470

COMBINATION METERS ASSEMBLY AND VEHICLE SPEED SENSOR

TSB Revision

CHASSIS ELECTRICAL

54A-51

CIRCUIT OPERATION

• The ignition switch (IG1) circuit is the power sup-

ply for the engine coolant temperature gauge.

• Resistance value, which the engine coolant tem-

perature gauge unit sends to the combination 
meter, is dependent on temperature of the engine 
coolant. This change in resistance causes the cir-
cuit current to fluctuate, thus moving the needle 
on the gauge.

.

TECHNICAL DESCRIPTION (COMMENT)
If there is an open in the ignition switch (IG1) circuit, 
the gauge needle will not move at all. If there is an 
open in the ground circuit, the gauge needle will 
move down to the extreme cold position.

.

TROUBLESHOOTING HINTS

• Malfunction of the engine coolant temperature 

gauge unit

• Malfunction of the combination meter (printed-cir-

cuit board or engine coolant temperature gauge 
assembly)

• The wiring harness or connectors may have 

loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector

DIAGNOSIS

Required Special Tool:
MB991223: Harness Set

STEP 1. Check the engine coolant temperature gauge by 
observing the other meters.
Check to see that the speedometer, tachometer and fuel gauge 
operate normally.
Q:  Do all other meters operate?

 YES < other meters all operate > : Go to Step 2.
 NO < one of the meters do not operate > : Refer to 

INSPECTION PROCEDURE 5 

P.54A-55

.

STEP 2. Check the engine coolant temperature gauge unit.
Check to see that the engine coolant temperature gauge unit 
operates normally. Refer to 

P.54A-64

.

Q:  Is the engine coolant temperature gauge unit normal?

YES : Go to Step 3.
NO :  Replace the engine coolant gauge unit. The engine 

coolant gauge should work normally.

COMBINATION METERS ASSEMBLY AND VEHICLE SPEED SENSOR

TSB Revision

CHASSIS ELECTRICAL

54A-52

STEP 3. Measure at combination meter connector D-32 in 
order to the ground circuit to the fuel level sensor.
(1) Disconnect combination meter connector D-32 and 

measure at the wiring harness side.

(2) Measure the resistance value between terminal 11 and 

ground.

• The resistance should equal 2 ohms or less.

Q: Is the measured resistance 2 ohms or less?

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

STEP 4. Check combination meter connector D-32 for 
loose, corroded or damaged terminals, or terminals 
pushed back in the connector.
Q: Is combination meter connector D-32 in good 

condition?
YES : Go to Step 5.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

. The fuel gauge should work normally.

STEP 5. Check the wiring harness between combination 
meter connector D-32 (terminal 11) and ground.
Q: Is the wiring harness between combination meter 

connector D-32 (terminal 11) and ground in good 
condition?
YES : There is no action to be taken.
NO :  Repair the wiring harness. The fuel gauge should 

work normally.

AC204170

CONNECTOR : D-32

CU

HARNESS SIDE

D-32(GR)

D-32(GR)

3

4

16

17

1

2

14

15

5

7 6

19

13

8

9

21

22

20

18

23

10

11

24

25

12

AC204738 EF

HARNESS SIDE: D-32

3

4

16

17

1

2

14

15

5

7 6

19

13

8

9

21

22

20

18

23

10

11

24

25

12

AC204170

CONNECTOR : D-32

CU

HARNESS SIDE

D-32(GR)

D-32(GR)

3

4

16

17

1

2

14

15

5

7 6

19

13

8

9

21

22

20

18

23

10

11

24

25

12

AC204170

CONNECTOR : D-32

CU

HARNESS SIDE

D-32(GR)

D-32(GR)

3

4

16

17

1

2

14

15

5

7 6

19

13

8

9

21

22

20

18

23

10

11

24

25

12

COMBINATION METERS ASSEMBLY AND VEHICLE SPEED SENSOR

TSB Revision

CHASSIS ELECTRICAL

54A-53

STEP 6. Check engine coolant temperature gauge unit 
connector B-38 and combination meter connector D-03 for 
loose, corroded or damaged terminals, or terminals 
pushed back in the connector.
Q: Are engine coolant temperature gauge unit connector 

B-38 and combination meter connector D-03 in good 
condition?
YES : Go to Step 7.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

. The engine coolant gauge should work 

normally.

AC204168

CONNECTOR : B-38

B-38(B)

B-38(B)

AD

1

HARNESS
SIDE

AC204170

CONNECTOR : D-03

AC

D-03(GR)

HARNESS 
SIDE

51

52

61 60

53

54

56

57

55

63

66 65 64

59

62

58

67

D-03(GR)

COMBINATION METERS ASSEMBLY AND VEHICLE SPEED SENSOR

TSB Revision

CHASSIS ELECTRICAL

54A-54

STEP 7. Check the wiring harness between engine coolant 
temperature gauge unit connector B-38 (terminal 1) and 
combination meter connector D-03 (terminal 64).

NOTE: Also check intermediate connector E-111. If intermedi-
ate connector E-111 is damaged, repair or replace the connec-
tor as described in GROUP 00E, Harness Connector 
Inspection 

P.00E-2

.

Q: Is the wiring harness between engine coolant 

temperature gauge unit connector B-38 (terminal 1) and 
combination meter connector D-03 (terminal 64) in good 
condition?
YES : Repair or replace the combination meter. The engine 

coolant gauge should work normally.

NO :  Repair the wiring harness. The engine coolant gauge 

should work normally.

AC204168

CONNECTOR : B-38

B-38(B)

B-38(B)

AD

1

HARNESS
SIDE

AC204170

CONNECTOR : D-03

AC

D-03(GR)

HARNESS 
SIDE

51

52

61 60

53

54

56

57

55

63

66 65 64

59

62

58

67

D-03(GR)

AC204176

CONNECTOR : E-111

BF

15

4

14

37

36

26 27

12

11

35

34

23 24

3

13

25

9

2

8

32

20 21

6

5

17

29

30

18

1

7

19

31

10

22

33

16

28

38