Mitsubishi Outlander GS45X. Manual — part 1028

AUTOMATIC A/C DIAGNOSIS

TSB Revision

AUTOMATIC AIR CONDITIONING

55B-3

COMPRESSOR CONTROL

When operating the A/C switch

• The air thermo sensor, which senses the temper-

ature of the air flowing out of the evaporator,
deactivates the compressor at 3

°C (37.4°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 ener-
gized.

When operating the mode selection dial

• The A/C will work when the mode selection dial is

set to the "Defroster" or "Defroster/foot" position,
or the temperature control dial is set to the "MAX-
IMUM 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

AUTOMATIC A/C DIAGNOSIS

INTRODUCTION

M1554006200095

After air is taken in through the damper, it is fed to
the evaporator by the blower fan and motor and
cooled. The air cooled by the air mix damper is
mixed appropriately with the warmed air to achieve a

comfortable temperature. If the A/C does not operate
or the cooled air is not discharged, the system com-
ponents or relay may be faulty.

Ignition switch (IG2)

ON

NOTE: A/C compressor clutch relay is
de-energized when any one switch,
sensor or control unit shown on the left
turns off.
NOTE: The components marked by

*

communicate with the ECM. If the air
thermo sensor detects a temperature of
3

°

C (37.4

°

F), the A/C-ECU will turn off

the A/C compressor clutch relay.

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

AUTOMATIC A/C DIAGNOSIS

TSB Revision

AUTOMATIC AIR CONDITIONING

55B-4

AUTOMATIC A/C TROUBLESHOOTING STRATEGY

M1554004700492

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.55B-12

)

4. Verify malfunction is eliminated.

DIAGNOSTIC FUNCTION

M1552019800358

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)

CAUTION

To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting 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 M.U.T.-III 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)

ZC501967

AC404789

AC701411AB

MB991824

MB991827

MB991910

Data link
connector

AUTOMATIC A/C DIAGNOSIS

TSB Revision

AUTOMATIC AIR CONDITIONING

55B-5

CAUTION

To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting 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.
2. Turn the ignition switch to the "ON" position.
3. Select "System select" from the start-up screen.
4. Select "From 2006 MY" of "Model Year." When the "Vehicle

Information" is displayed, check the contents.

5. Select "Air Conditioner" from "System List", and press the

"OK" button.
NOTE: When the "Loading Option Setup" list is displayed,
check the applicable item.

6. Select "Diagnostic Trouble Code" to read the DTC.
7. If a DTC is set, it is shown.
8. Choose "Erase DTCs" to erase the DTC.

HOW TO READ DATA LIST

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)

CAUTION

To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
1. Connect the scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Select "System select" from the start-up screen.
4. Select "From 2006 MY" of "Model Year." When the "Vehicle

Information" is displayed, check the contents.

5. Select "Air Conditioner" from "System List", and press the

"OK" button.
NOTE: When the "Loading Option Setup" list is displayed,
check the applicable item.

6. Select "Data List."
7. Choose an appropriate item and select the "OK" button.

HOW TO PERFORM ACTUATOR TEST

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

AUTOMATIC A/C DIAGNOSIS

TSB Revision

AUTOMATIC AIR CONDITIONING

55B-6

• MB991910: M.U.T.-III Main Harness A (Vehicles with

CAN communication system)

CAUTION

To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
1. Connect the scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Select "System select" from the start-up screen.
4. Select "From 2006 MY" of "Model Year." When the "Vehicle

Information" is displayed, check the contents.

5. Select "Air Conditioner" from "System List", and press the

"OK" button.
NOTE: When the "Loading Option Setup" list is displayed,
check the applicable item.

6. Select "Actuator Test."
7. Choose an appropriate item and select the "OK" button.

HOW TO DIAGNOSE THE CAN BUS LINE

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)

CAUTION

To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Select "CAN bus diagnosis" from the start-up screen.
4. When the vehicle information is displayed, confirm that it

matches the vehicle whose CAN bus lines will be
diagnosed.

• If they match, go to Step 8.

• If not, go to Step 5.

5. Select "view vehicle information" button.
6. When the vehicle information is displayed, confirm again

that it matches the vehicle which is being diagnosed.

• If they match, go to Step 8.

• If not, go to Step 5.

7. Press the "OK" button.
8. When the options are displayed, choose the options (mark

the check) and then select "OK".