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

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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