Mitsubishi Montero (2004+). Manual — part 575

RV METER

TSB Revision

CHASSIS ELECTRICAL

54A-269

STEP 3. Using scan tool MB991958, read the A/C
diagnostic trouble code.

CAUTION

To Prevent to damage to scan toll MB991958, always turn
the ignition switch to "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 "ON" position.
(3) Read the A/C diagnostic trouble code.
Q: Is A/C diagnostic trouble code 13 or 14 set?

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

STEP 4. Check the ambient air temperature sensor.

(1) Remove the radiator grille.
(2) Remove the ambient air temperature sensor.
(3) Measure the resistance between the ambient air

temperature sensor terminals at two or more temperature
conditions.

Q: Does the resistance value exist within the characteristic

graph?
YES : There is no action to be taken.
NO : Replace the ambient air temperature sensor.

AC306409AF

MB991911

MB991824

MB991827

ACX2146 AB

RV METER

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CHASSIS ELECTRICAL

54A-270

STEP 5. Check ambient air temperature sensor connector
A-29 and RV meter connector D-08 <vehicles with
automatic air conditioning system> or RV meter connector
D-07 <vehicles with manual air conditioning system> for
loose, corroded or damaged terminals, or terminals
pushed back in the connector.

Q: Are ambient air temperature sensor connector A-29 and

RV meter connector D-08 <vehicles with automatic air
conditioning system> or RV meter connector D-07
<vehicles with manual air conditioning system> in good
condition?
YES <Vehicles with automatic air conditioning system>
:

Go to Step 6 .

YES <Vehicles with manual air conditioning system> :

Go to Step 8 .

NO : Repair or replace them. Refer to GROUP 00E,

Harness Connector Inspection

P.00E-2

.

AC204166

CONNECTOR : A-29

AP

A-29(B)

A-29(B)

1

2

HARNESS
SIDE

AC204188

D-08(B)

1

3

4

2

12

1413

11

6

7

8

10 9

18

19

20

16

17

5

15

AC204188

CONNECTORS: D-07, D-08

BT

HARNESS SIDE

HARNESS SIDE

D-07(B)

22

23

30

31

25

26

33

34

32

24

28

3635

27

29

21

D-07(B)

D-08(B)

RV METER

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CHASSIS ELECTRICAL

54A-271

STEP 6. Check the RV meter and A/C-ECU <vehicles with
automatic air conditioning system> circuit by
backprobing.

(1) Do not disconnect RV meter connector D-08.
(2) Ignition switch: "ACC" position.
(3) Measure the voltage (waveform) between the terminal 9

and the ground using an oscilloscope by backprobing.

(4) Measure the voltage (waveform) between terminal 10 and

ground by backprobing.

(5) Measure the voltage (waveform) between terminal 19 and

ground by backprobing.

Q: Is the measured voltage Hi = 4 to 5 volts and Lo = 0 to 1

volt?
YES : Replace the RV meter.
NO : Go to Step 7.

AC204738

20

19

18

17

7

6

15

14

4

3

11 12 13

5

1

9 10

2

16

8

AC204738 DV

HARNESS SIDE: D-08

AC204738 DW

HARNESS SIDE: D-08

20

19

18

17

7

6

15

14

4

3

11 12 13

5

1

9 10

2

16

8

AC204738 DX

HARNESS SIDE: D-08

20

19

18

17

7

6

15

14

4

3

11 12 13

5

1

9 10

2

16

8

RV METER

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CHASSIS ELECTRICAL

54A-272

STEP 7. Check the harness wires between RV meter
connector D-08 (terminal 9 and 10 and 19) and A/C-ECU
connector D-23 (terminal 16 and 17 and 6).

Q: Are harness wires between RV meter connector D-08

(terminal 9 and 10 and 19) and A/C-ECU connector D-23
(terminal 16 and 17 and 6) in good condition?
YES : Go to Step 9.
NO : Repair or replace them. Refer to GROUP 00E,

Harness Connector Inspection

P.00E-2

.

AC204188

D-08(B)

1

3

4

2

12

1413

11

6

7

8

10 9

18

19

20

16

17

5

15

AC204188

CONNECTORS: D-08, D-23

BU

HARNESS SIDE

HARNESS SIDE

D-08(B)

D-23(B)

D-23(B)

1

3

4

2

12

1413

11

6

7

8

10 9

18

19

20

16

17

5

15