Mitsubishi Montero Sport (2004+). Manual — part 598

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55-19

STEP 3. Check the rear heater switch continuity.

Remove the rear heater switch and check continuity.

Q: Is the rear heater switch normal?

YES : Go to Step 4.
NO : Replace. Then go to Step 5.

STEP 4. Check the resister resistance value.

Use an ohmmeter to check the resistance between terminals
number 3 and 4. Check that the measured value is at the stan-
dard value.

Standard value: 3.9

Ω

Q: Is the resistance value correct?

YES : The procedure is complete. (If no malfunctions are

found in all steps, an intermittent malfunction is
suspected. Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points

− How to

Cope with Intermittent Malfunction

P.00-7

.)

NO : Replace. Then go to Step 5.

STEP 5. Retest the system.
NOTE: The condenser fan might not operate when there is an
air conditioning low load from the air conditioning condenser
control, so remove the negative battery terminal and then
check the symptoms after 5 minutes since initial start control
after reconnection.
Q: Is the condenser fan operating correctly?

YES : The procedure is complete.
NO : Go to Step 1.

SWITCH
POSITION

TESTER
CONNECTION

SPECIFIED
CONDITION

At the "OFF"
position

1

− 4

2

− 4

Open circuit

At the "LO"
position

2

− 4

Less than 2 ohms

At the "HI"
position

1

− 4

Less than 2 ohms

AC002861

LO

OFF

HI

AC

AC002863AB

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55-20

INSPECTION PROCEDURE 8: The Rear Heater Air Volume cannot be Controlled in Two Steps.

DIAGNOSIS

STEP 1. Check the rear heater switch continuity.

Remove the rear heater switch and check continuity.

Q: Is the rear heater switch normal?

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

STEP 2. Check the resister resistance value.

Use an ohmmeter to check the resistance between terminals
number 3 and 4. Check that the measured value is at the stan-
dard value.

Standard value: 3.9

Ω

Q: Is the resistance value correct?

YES : The procedure is complete. (If no malfunctions are

found in all steps, an intermittent malfunction is
suspected. Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points

− How to

Cope with Intermittent Malfunction

P.00-7

.)

NO : Replace. Then go to Step 3.

STEP 3. Retest the system.
NOTE: The condenser fan might not operate when there is an
air conditioning low load from the air conditioning condenser
control, so remove the negative battery terminal and then
check the symptoms after 5 minutes since initial start control
after reconnection.
Q: Is the condenser fan operating correctly?

YES : The procedure is complete.
NO : Go to Step 1.

SWITCH
POSITION

TESTER
CONNECTION

SPECIFIED
CONDITION

At the "OFF"
position

1

− 4

2

− 4

Open circuit

At the "LO"
position

2

− 4

Less than 2 ohms

At the "HI"
position

1

− 4

Less than 2 ohms

AC002861

LO

OFF

HI

AC

AC002863AB

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55-21

INSPACTION PROCEDURE 9: When the Heater Control Knob is Set to the "MAX COOL" Position, the
Air-Conditioning does not Cool Sufficiently.

DIAGNOSIS

STEP 1. Check for refrigerant leaks.
Q: Is the refrigerant leaking?

YES : Repair. Then go to Step 4.
NO : Go to Step 2.

STEP 2. 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 3.
NO : Replace. Then go to Step 4.

STEP 3. 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

55-22

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 4.
NO : Replace. Then go to Step 4.

STEP 4. 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