Mitsubishi 380. Manual — part 209

AUTO A/C DIAGNOSIS

HEATER, AIR CONDITIONING AND VENTILATION

55-132

STEP 5. Check the wiring harness between photo sensor
connector C-04 (terminals 3, 4) and A/C-ECU connector
C-15 (terminal 19), C-16 (terminal 25).
Q: Is the wiring harness between photo sensor connector

C-04 (terminals 3, 4) and A/C-ECU connector C-15
(terminal 19), C-16 (terminal 25) in good condition?
YES : Go to Step 6.
NO : Repair the wiring harness. Check that the air

conditioning works normally.

STEP 6. Replace the photo sensor.

Q: Does the A/C operate normally?

YES : No action is necessary and testing is complete.
NO : Replace the A/C-ECU. Check that the air conditioning

works normally.

STEP 7. Check the refrigerant level.
Use the refrigerant recovery station to remove all of the refrig-
erant, and then calculate the amount of the refrigerant and
charge it.

Q: Is the refrigerant level correct?

YES : Refer to GROUP 55A, Symptom Chart

P.55-68

.

NO : Correct the refrigerant level. Check that the air

conditioning works normally. (Refer to GROUP 55A
On-vehicle Service

P.55-141

).

25DB070A

CONNECTORS: C-15, C-16

C-16 (B)

HARNESS SIDE

C-16

C-15

C-15 (B)

HARNESS SIDE

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

25DB136A

CONNECTOR: C-04

HARNESS SIDE

AUTO A/C DIAGNOSIS

HEATER, AIR CONDITIONING AND VENTILATION

55-133

DATA LIST REFERENCE TABLE

M1554005100136

MUT-III
DIAGNOSTIC
TOOL DISPLAY

ITEM
NO.

INSPECTION ITEM

INSPECTION REQUIREMENT

NORMAL VALUE

Inside
temperature
sensor

59

Interior temperature
sensor

Ignition switch: ON

Inside air
temperature and
temperature
displayed on the
diagnostic tool are
identical.

Outside
temperature
sensor

58

Outside temperature
sensor

Ignition switch: ON

Outside air
temperature and
temperature
displayed on the
diagnostic tool are
identical.

Air thermo sensor 20

Air thermo sensor

Ignition switch: ON

The temperature
measured behind
the evaporator
matches the
displayed value on
the diagnostic tool
while the engine is
cold.

Pressure sensor

61

A/C pressure sensor Ignition switch: ON

Measured refrigerant
pressure is nearly
equal to the value
shown on the
diagnostic tool
(MPa).

Water
temperature
sensor

62

Engine coolant
temperature sensor
(Data received by
CAN
Communication)

Ignition switch: ON

Engine coolant
temperature and
temperature
displayed on the
diagnostic tool are
identical.

Photo sensor

67

Photo sensor

Ignition switch: ON

Amount of light is
proportional to
voltage displayed on
the diagnostic tool.

Air mix
potentiometer

63

Air mixing damper
control motor
potentiometer

Ignition switch: ON Damper

position

Opening degree (V)

MAX. HOT

Approx. 5

MAX. COOL

Approx. 0

Air mix
potentiometer
(Target)

64

Target value for air
mixing damper
control motor
potentiometer

Ignition switch: ON Damper

position

Opening degree (V)

MAX. HOT

Approx. 5

MAX. COOL

Approx. 0

AUTO A/C DIAGNOSIS

HEATER, AIR CONDITIONING AND VENTILATION

55-134

Air outlet c/o
potentiometer

55

Mode selection
damper control
motor potentiometer

Ignition switch: ON Damper

position

Opening degree (V)

FACE

Approx. 5

FOOT

Approx. 3.75

FOOT/DEF.

Approx. 2.5

DEF.

Approx. 1.75

Air outlet c/o
potentiometer
(target)

56

Target value for
mode selection
damper control
motor potentiometer

Ignition switch: ON Damper

position

Opening degree (V)

FACE

Approx. 5

FOOT

Approx. 3.75

FOOT/DEF.

Approx. 2.5

DEF.

Approx. 1.75

In/out air
changeover
damper motor

65

Outside/inside air
selection damper
control motor

Ignition switch: ON Damper set

position

Damper position

Fresh air
position

FRESH

Air recirculation
position

RECIRC

Front blower fan

68

Blower motor

Ignition switch: ON

The actual air
volume (blower
motor speed)
corresponds to the
air volume shown on
the diagnostic tool.

Front blower
motor voltage

71

Blower motor

Ignition switch: ON

The air volume set
by the heater control
corresponds to the
value shown on the
diagnostic tool. (V)

Air conditioning
switch state

1

Air conditioning
switch

Ignition switch: ON Air conditioning

switch: ON

Diagnostic tool
indication: "pressed"

Air conditioning
switch: OFF

Diagnostic tool
indication: "release"

Rear defogger
switch state

7

Rear window
defogger switch

Ignition switch: ON Rear window

defogger
switch: ON

Diagnostic tool
indication: "pressed"

Rear window
defogger
switch: OFF

Diagnostic tool
indication: "release"

Refrigerant
pressure

73

Refrigerant pressure Ignition switch: ON

The diagnostic tool
indication is normal

MUT-III
DIAGNOSTIC
TOOL DISPLAY

ITEM
NO.

INSPECTION ITEM

INSPECTION REQUIREMENT

NORMAL VALUE

AUTO A/C DIAGNOSIS

HEATER, AIR CONDITIONING AND VENTILATION

55-135

Temperature
setting

23

Temperature setting
actual

Ignition switch: ON

The actual setting
corresponds with
diagnostic tool
display.

Vehicle speed

26

Actual vehicle speed Ignition switch: ON

The vehicle speed
corresponds with
diagnostic tool
display.

A/C compressor
drive request

27

Compressor clutch

Engine: ON

Compressor:
ON

Diagnostic tool
indication: "ON"

Compressor:
OFF

Diagnostic tool
indication: "OFF"

Illumination

15

Display lighting

Ignition switch: ON

Lights: ON

Diagnostic tool
indication: "ON"

Lights: OFF

Diagnostic tool
indication: "OFF"

Engine speed

23

Actual engine speed Engine: ON

The engine speed
corresponds with
diagnostic tool
display.

In/out air select
switch state

3

In/out air select
switch

Ignition switch: ON In/out air

switch: ON

Diagnostic tool
indication: "pressed"

In/out air
switch: OFF

Diagnostic tool
indication: "release"

Rear defogger
relay

72

Rear defogger relay

Ignition switch: ON

Rear defogger:
ON

Diagnostic tool
indication: "ON"

Rear defogger:
OFF

Diagnostic tool
indication: "OFF"

MUT-III
DIAGNOSTIC
TOOL DISPLAY

ITEM
NO.

INSPECTION ITEM

INSPECTION REQUIREMENT

NORMAL VALUE