Mitsubishi Outlander XL. Manual — part 1178

GENERAL DESCRIPTION

M15502000001USA0000010000

The blower, heater, and evaporator have been
integrated with the heater and A/C system to achieve
greater fan power and noise reduction.

Item

Specification

Heater control assembly

Dial type

Compressor

MSC90CAS

Compressor model

Scroll type

Refrigerant and quantity g (oz)

R-134a (HFC-134a), 480 - 520 (16.9 - 18.3)

SAFETY PRECAUTIONS

Wear safety goggles and gloves when servicing
the refrigeration system to prevent severe
damage to eyes and hands.
Because R-134a refrigerant is a hydro fluorocarbon
(HFC) which contains hydrogen atoms in place of
chlorine atoms, it will not cause damage to the ozone
layer.
Ozone filters out harmful radiation from the sun. To
assist in protecting the ozone layer, Mitsubishi Motors
Corporation recommends an R-134a refrigerant
recycling device.
Refrigerant R-134a is transparent and colorless in
both the liquid and vapor state. Since it has a boiling
point of -29.8°C (-21.64°F) at atmospheric pressure,
it will be a vapor at all normal temperatures and
pressures. The vapor is heavier than air, non-
flammable, and non-explosive. The following
precautions must be observed when handling
R-134a.

Do not heat R-134a above 40°C (104.0°F) or it may
catch fire and explode.
R-134a evaporates so rapidly at normal atmospheric
pressures and temperatures that it tends to freeze
anything it contacts. For this reason, extreme care
must be taken to prevent any liquid refrigerant from
contacting the skin and especially the eyes. Always
wear safety goggles when servicing the refrigeration
part of the A/C system. Keep a bottle of sterile mineral
oil handy when working on the refrigeration system.

1.

Should any liquid refrigerant get into your eyes, use
a few drops of mineral oil to wash them out. R-134a
is rapidly absorbed by the oil.

2.

Next, splash your eyes with plenty of cold water.

3.

Call your doctor immediately even if irritation has
ceased.

Keep R-134a containers upright when charging
the system.
In most instances, moderate heat is required to bring
the pressure of the refrigerant in its container above
the pressure of the system when charging or adding
refrigerant.
A bucket or large pan of hot water not over 40°C
(104.0°F) is all the heat required for this purpose. Do
not heat the refrigerant container with a blow torch or
any other means that would raise temperature and
pressure above this temperature. Do not weld or
steam-clean on or near the system components or
refrigerant lines.

The leak detector for R-134a should be used to
check for refrigerant gas leaks.

Do not allow liquid refrigerant to touch bright
metal or it will be stained.
When metering R-134a into the refrigeration system,
keep the supply tank or cans in an upright position. If
the refrigerant container is on its side or upside down,
liquid refrigerant will enter the system and damage the
compressor.
Refrigerant will tarnish bright metal and chrome
surfaces, and in combination with moisture can
severely corrode all metal surfaces.

AIR CONDITIONING

55A-3

GENERAL DESCRIPTION

OPERATION

CONDENSER FAN AND RADIATOR FAN
CONTROL
The ECM judges the required revolution speed of
radiator fan motor and condenser fan motor using the
input signals transmitted from A/C switch, output shaft
speed sensor and engine coolant temperature
sensor.

COMPRESSOR CONTROL

When operating the A/C switch

｠

The fin thermo sensor, which senses the
temperature of the air flowing out of the evaporator
directly, deactivates the compressor at 1°C (33.8°
F) or below.

｠

The A/C pressure sensor turns OFF when the
refrigerant pressure becomes excessively high or
low, thus protecting the compressor circuit (See
Table below).

｠

When the air thermo sensor is activated, and the
ignition switch, blower switch, and A/C switch are
ON, the A/C compressor clutch relay is energized.

When operating the mode selection dial

｠

The A/C will work when automatically the mode
selection dial is set to the "Defroster" or "Defroster/
foot" position, or the temperature control dial is set
to the "MAXIMUM A/C" position. In other dial
positions, when the A/C switch is turned on, the A/
C will work.

A/C Compressor Clutch Relay ON Conditions

Ignition switch (IG2)

ON

Blower speed selection dial

ON

A/C switch

ON

Mode selection dial

defroster

Temperature control dial

MAXIMUM
A/C

Air thermo sensor

*

Pressure detected
by A/C pressure
sensor

2.94 MPa (427 psi) or less [If
the

refrigerant

pressure

exceeds 2.94 MPa (427 psi),
A/C compressor clutch relay is
not ON condition until the
refrigerant pressure has been
measured up to 2.35 MPa
(341 psi) or less.]

ON

0.19 MPa (27psi) or more [If
the refrigerant pressure falls
short of 0.19 MPa (27psi), A/C
compressor clutch relay is not
ON

condition

until

the

refrigerant pressure has been
measured up to 0.22 MPa
(32psi) or more.]

A/C compressor clutch relay driving transistor
(within ECM)

ON

55A-4

AIR CONDITIONING

GENERAL DESCRIPTION

SERVICE PRECAUTION(S)

CAUTION LABELS

M15502000909USA0000010000

ZC6036270000

The refrigerant gas warning label must be affixed in the location
shown in the figure on the left. Follow the instructions on the label
when servicing.

ZC603626

1

2

3

3

2

0000

4

No.

Contents

1

Name of A/C manufacturer

2

Amount of refrigerant

3

Name of compressor oil

4

Parts number

MANUAL A/C DIAGNOSIS

INTRODUCTION TO HEATER, AIR CONDITIONING AND VENTILATION DIAGNOSIS

M15502000122USA0000010000

Air is drawn into the heater assembly from either the
outside, or from the inside of the passenger cabin if
DEFROST, maximum cooling or RECIRCULATION
are selected. The air is then forced through the
evaporator where heat is removed, cooling and de-
humidifying the air. Depending on the temperature
selected, a portion of this air is then forced through the
heater core to achieve the selected discharge
temperature.

If the system does not cool properly, look for a
problem with the refrigerant, blower or air distribution
systems. If the system does not heat properly, look for
a problem with the coolant, blower or air distribution
systems. In either case all system fuses, circuit
breaker and relays should be checked.

HEATER, AIR CONDITIONING AND VENTILATION DIAGNOSTIC TROUBLESHOOTING

STRATEGY

M15502000096USA0000010000

Use these steps to plan your diagnostic strategy. If
you follow them carefully, you will be sure that you
have exhausted most of the possible ways to find a
heater, air conditioning and ventilation fault.

1.

Gather information from the customer.

2.

Verify that the condition described by the customer
exists.

3.

Find the malfunction by following the Symptom
Chart. (Refer to P.55A-60.)

4.

Verify that the malfunction is eliminated.

AIR CONDITIONING

55A-5

SERVICE PRECAUTION(S)

DIAGNOSTIC FUNCTION

M15502000911USA0000010000

HOW TO CONNECT THE SCAN TOOL (M.U.T.-III)

Required Special Tools:

｠

MB991958: Scan Tool (M.U.T.-III Sub Assembly)

｠

MB991824: Vehicles Communication Interface (V.C.I.)

｠

MB991827: M.U.T.-III USB Cable

｠

MB991910: M.U.T.-III Main Harness A (Vehicles with
CAN communication system)

ZC501967

AC404789

ZC5019680000

MB991824

MB991827

MB991910

Data link

connector

To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991958.

1.

Ensure that the ignition switch is at the "LOCK" (OFF) position.

2.

Start up the personal computer.

3.

Connect special tool MB991827 to special tool MB991824 and
the personal computer.

4.

Connect special tool MB991910 to special tool MB991824

5.

Connect special tool MB991910 to the data link connector.

6.

Turn the power switch of special tool MB991824 to the "ON"
position.

NOTE:

When the special tool MB991824 is energized, the

special tool MB991824 indicator light will be illuminated
in a green color.

7.

Start the scan tool system on the personal computer.

NOTE:

Disconnecting scan tool MB991958 is the reverse of

the connecting sequence, making sure that the ignition
switch is at the "LOCK" (OFF) position.

HOW TO READ AND ERASE DIAGNOSTIC

TROUBLE CODES

Required Special Tools:

｠

MB991958: Scan Tool (M.U.T.-III Sub Assembly)

｠

MB991824: Vehicles Communication Interface (V.C.I.)

｠

MB991827: M.U.T.-III USB Cable

｠

MB991910: M.U.T.-III Main Harness A (Vehicles with
CAN communication system)

To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991958.

NOTE:

If the battery voltage is low, diagnostic trouble

codes will not be set. Check the battery if scan tool
MB991958 does not display.

1.

Connect the scan tool MB991958 to the data link connector.

55A-6

AIR CONDITIONING

MANUAL A/C DIAGNOSIS