Mitsubishi Colt Ralliart. Manual - part 534

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55A-44

SERVICE DATA REFERENCE TABLE

M1554005100266

Item No.

Check items

Check contents

02

Ambient temperature sensor Ignition switch: ON

Ambient temperature is the 
same as M.U.T.-III displayed 
temperature

03

Air thermo sensor

Ignition switch: ON

Evaporator outlet temperature 
is the same as M.U.T.-III 
displayed temperature

04

A/C pressure sensor

Ignition switch: ON

According with the chart for 
simple inspection of the A/C 
pressure sensor (Refer to 
GROUP 55, On-vehicle 
Service 

P.55A-51

).

05

Water temperature sensor

Ignition switch: ON

The coolant temperature is 
the same as M.U.T.-III 
displayed temperature

07

Set temperature

Ignition switch: ON

Displays the set temperature

08

Set temperature (control 
part set value)

Ignition switch: ON

Display the control part set 
temperature

15

Outside/Inside air selection 
damper

Ignition switch: ON

Display the outside/inside air 
selection damper position

20

Blower motor

Ignition switch: ON

Display the rotation speed of 
blower motor

21

Blower motor (Target)

Ignition switch: ON

Display the target rotation 
speed of blower motor

30

A/C switch

Ignition switch: ON

Display the A/C switch status

31

A/C switch (control part set 
value)

Ignition switch: ON

A/C switch status

35

Rear window defogger 
switch (control part set 
value)

Ignition switch: ON

Display the rear window 
defogger switch status

36

Blower switch

Ignition switch: ON

Display the blower switch 
status

37

Outside/Inside air selection 
switch

Ignition switch: ON

Display the outside/inside air 
selection switch status

40

Abnormal low pressure 
judgement

Ignition switch: ON

Displays the abnormal low 
pressure judgement

41

Refrigerant leaks judgement Ignition switch: ON

Display the refrigerant leaks 
judgement

42

DEF position flag

Ignition switch: ON

Display the DEF position flag

43

Forcible DEF position flag

Ignition switch: ON

Display the forcible DEF 
position flag

44

Forcible DEF DRY flag

Ignition switch: ON

Display the forcible DEF DRY 
flag

Main

Index

Group

TOC

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55A-45

ACTUATOR TEST TABLE

M1554005200241

Item No.

Check items

Drive content

01

Blower motor: OFF

Stop

02

Blower motor: 8 speed

Middle speed

03

Blower motor: 16 speed

High speed

30

Outside/Inside air selection damper control 
motor

Moved to recirculation-side

31

Moved to outside air-side

40

Rear defogger switch

OFF

41

ON

09*

Condenser fan

Stop

0B*

OPERATION

50*

Idle-up requirement

OFF

51*

Low-load

52*

High-load

NOTE: *: Drive at the engine operation

Main

Index

Group

TOC

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55A-46

CHECK AT COMBINATION METER 
(METER AND A/C-ECU) TERMINALS

M1552010300787

AC206265

AB

35

34

252627

32

31

24

2223

33

29

21

30

36

28

52

49 50 51

44

43

45 46

48

47

41 42

20

19

18

17

7

6

15

14

4

3

1112 13

5

1

9 10

2

16

8

Terminal No.

Check items

Check conditions

Normal conditions

4

Communication with 
heater control (Rear 
defogger switch)

Rear window defogger relay: ON

System voltage

Rear window defogger relay: OFF

0 V

5

Communication with 
heater control 
(Outside/Inside air 
selection switch)

Outside/Inside air selection switch: 
ON 

System voltage

Outside/Inside air selection switch: 
OFF 

0 V

6

Communication with 
heater control (A/C 
switch)

A/C switch: ON

12 V

A/C switch: OFF

0 V

7

Blower switch

IG2: ON
Blower switch: ON

System voltage

Blower switch: OFF

0 V

8

Input from the A/C 
pressure sensor

Refer to 

P.55A-51

Refer to 

P.55A-51

9

Air thermo sensor

Sensor probe temperature 25

°C 

(1.5k 

Ω)

2.2 V

10

Ambient 
temperature sensor

Sensor probe temperature 25

°C 

(1.5k 

Ω)

2.2 V

Main

Index

Group

TOC

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55A-47

11

Heater control panel 
illumination 
(Outside/Inside air 
selection switch)

When setting the air recirculation 
position

12 V

When setting the fresh air position

0 V

12

Heater control panel 
illumination (Rear 
defogger switch)

Defogger switch: ON

12 V

Defogger switch: OFF

0 V

13

Rear defogger relay IG2: ON

System voltage

15

Sensor earth

Always

0 V

16

Outside/Inside air 
selection damper 
control motor

When the damper is moved to the 
inside air recirculation position

0 V

When the damper is moved to the 
fresh air position

System voltage

17

Outside/Inside air 
selection damper 
control motor

When the damper is moved to the 
inside air recirculation position

System voltage

When the damper is moved to the 
fresh air position

0 V

18

Heater control panel 
illumination (A/C 
switch)

A/C switch: ON

12 V

A/C switch: OFF

0 V

29

Heater control power 
supply

IG2: ON

12 V

30

A/C pressure sensor 
power supply

IG2: ON

5 V

31

Ignition switch (IG1) 
power supply

IG1: ON

System voltage

32

Ignition switch (IG2) 
power supply

IG2: ON

System voltage

33

Battery power supply Always

System voltage

34

A/C pressure sensor 
earth

Always

0 V

35

Heater control earth Always

0 V

Terminal No.

Check items

Check conditions

Normal conditions

Main

Index

Group

TOC