Mitsubishi Montero Sport (2004+). Manual - part 599

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55-23

INSPACTION PROCEDURE 10: Warm Air does not Go Out From the Air Outlets

DIAGNOSIS

STEP 1. Check the water shut motor

CAUTION

When the motor stops, disconnect battery cable.
Follow the table below to check the water shut motor for correct 
operation.

Q: Does water shut motor work normally?

YES : Go to Step 2.
NO :  Replace. Then go to Step 3.

STEP 2. Check the water shut valve controller continuity.
NOTE: When the temperature control knob is at the "MAX 
COOL" position, power is supplied to the water shut relay.

LEVER POSITION BATTERY 

CONNECTION

LEVER 
OPERATION

At the open position

• Connect 

terminal 3 to the 
positive battery 
terminal

• Connect 

terminal 1 to the 
negative battery 
terminal

The lever moves 
from the open 
position to the 
closed position

At the close 
position

• Connect 

terminal 3 to the 
positive battery 
terminal

• Connect 

terminal 2 to the 
negative battery 
terminal

The lever moves 
from the closed 
position to the open 
position

AC306351AB

OPEN 
SIDE

CLOSE
SIDDE

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55-24

Follow the table below to check the water shut valve controller 
for continuity.

Q: Is the water shut valve controller in good condition?

YES : Go to Step 3.
NO :  Replace. Then go to Step 3.

STEP 3. Check symptoms.
Q: Is the cool air discharged?

YES : This diagnosis is complete. (If no malfunctions are not 

found in all steps, an intermittent malfunction is 
suspected. Refer to Introduction, How to Use 
Troubleshooting/Inspection Service Points 

− How to 

Cope with Intermittent Malfunction 

P.00-7

.)

NO :  Go to Step 1 .

TEMPERATURE 
CONTROL KNOB 
POSITION

BATTERY CONNECTION TESTER 

CONNECTION

SPECIFIED 
CONDITION

At the "MAX 
COOL" position

• Connect 

terminal 7 to 
the positive 
battery 
terminal

• Connect 

terminal 3 to 
the negative 
battery 
terminal

3 

− 8

Less than 2 
ohms

At the other than 
"MAX COOL" 
position

• Connect 

terminal 7 to 
the positive 
battery 
terminal

• Connect 

terminal 3 to 
the negative 
battery 
terminal

1 

− 3

Less than 2 
ohms

AC002849

DEFROSTER

SWITCH

AB

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55-25

INSPECTION AT THE AUTOMATIC COMPRESSOR CONTROLLER TERMINAL

M1552010300602

1

2 3 4 5 6

7 8

9 10

11 12 13 14 15 16 17 18 19 20

AC000026

AB

TERMINAL 
NO.

CHECK ITEM

CHECKING REQUIREMENTS

NORMAL CONDITION

1

IG2 power supply

Ignition switch ON

Battery positive voltage

2

A/C switch input

A/C switch OFF or blower switch OFF

0 V

A/C switch ON   Ignition switch ON   
Blower switch ON

Battery positive voltage

4

Air conditioning output

A/C compressor clutch relay OFF

0 V

A/C compressor clutch relay ON

Battery positive voltage

8

Ground

At all times

Continuity

9

Ground

At all times

Continuity

14

Air thermo sensor power 
supply

At all times

4.8 

− 5.2 V

15

Air thermo sensor input

Sensor temperature 25

°C (77°F) (4 kΩ) 2.3 − 2.9 V

16

Outside air temperature 
sensor power supply

At all times

4.8 

− 5.2 V

17

Outside air temperature 
sensor input

Sensor temperature 25

°C (77°F) (4 kΩ) 2.3 − 2.9 V

18

Backup power supply

At all times

Battery positive voltage

19

Outside air temperature 
output

Sensor temperature 15

°C (52°F) or 

more

Battery positive voltage

Sensor temperature 18

°C (64°F) or 

more

2 V or more

SPECIAL TOOLS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55-26

SPECIAL TOOLS

M1552000600248

TOOL

TOOL NUMBER AND 
NAME

SUPER SESSION

APPLICATION

MB991367
Special spanner

MB991367-01

Armature mounting nut of 
compressor removal and 
installation

MB991386
Pin

MIT217213

MB990784
Ornament remover

General service tool

Meter bezel assembly removal

B991367

MB990784