Mitsubishi Outlander XL. Manual - part 1178

GENERAL DESCRIPTION

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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

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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

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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

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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