Mitsubishi Grandis. Manual — part 325
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-185
33
Rear control fan OFF
switch<Vehicles with rear
heater, rear cooler or dual
automatic A/C>
Rear air volume adjusting
switch: AUTO
AUTO
Rear air volume adjusting
switch: 1
Lo
Rear air volume adjusting
switch: 2
Me
Rear air volume adjusting
switch: 3
Hi
34
Rear defogger switch
Rear window defogger
switch: ON
ON
Rear window defogger
switch: OFF
OFF
35
PTC heater switch
<Vehicles with rear heater,
rear cooler or dual
automatic A/C>
Heater switch ON
ON
Heater switch OFF
OFF
36
Rear fan SW lamp (Front)
<Vehicles with rear heater,
rear cooler or dual
automatic A/C>
Rear fan switch: ON
ON
Rear fan switch: OFF
OFF
37
Rear control OFF SW lamp
(Front) <Vehicles with rear
heater, rear cooler or dual
automatic A/C>
Rear fan switch: ON
ON
38
Rear control OFF SW lamp
<Vehicles with rear heater,
rear cooler or dual
automatic A/C>
Rear air volume adjusting
switch: OFF
ALL OFF
Rear air volume adjusting
switch: AUTO
AUTO
Rear air volume adjusting
switch: 1
Lo
Rear air volume adjusting
switch: 2
Me
Rear air volume adjusting
switch: 3
Hi
−
ALL ON
39
PTC heater lamp <Vehicles
with rear heater or dual
automatic A/C>
Heater switch ON
ON
Heater switch OFF
OFF
40
Illuminations power supply
Lighting switch: ON
ON
Lighting switch: OFF
OFF
41
PTC heater relay <Vehicles
with rear heater or dual
automatic A/C>
PTC heater relay: ON
ON
PTC heater relay: OFF
OFF
Item No.
Check items
Inspection status
The display contents under
normal conditions
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-186
ACTUATOR TEST TABLE
M1554005200188
50
Front Temperature setting
−
Display the temperature
control dial position (18.0 -
32.0
°C)
51
Rear Temperature setting
<Vehicles with rear heater,
rear cooler or dual
automatic A/C>
−
Display the rear temperature
control lever position (20.0 -
30.0
°C)
55
Refrigerant leak
Normal refrigerant level
NORMAL
Checking refrigerant level
Checking
Defective refrigerant level
Fail
56
Low pressure
Normal refrigerant pressure NORMAL
Checking refrigerant
pressure
Checking
Defective refrigerant
pressure
Fail
Item No.
Check items
Inspection status
The display contents under
normal conditions
Item No.
Check items
Drive content
01
Front blower fan: OFF
Stop
02
Front blower fan: Middle
Middle speed
03
Front blower fan: High
High speed
04
Rear blower fan: OFF <Vehicles with rear
heater, rear cooler or dual automatic A/C>
Stop
05
Rear blower fan: AUTO <Vehicles with rear
heater, rear cooler or dual automatic A/C>
AUTO
06
Rear blower fan: Lo <Vehicles with rear heater,
rear cooler or dual automatic A/C>
Low speed
07
Rear blower fan: Middle <Vehicles with rear
heater, rear cooler or dual automatic A/C>
Middle speed
08
Rear blower fan: High <Vehicles with rear
heater, rear cooler or dual automatic A/C>
High speed
09
Condenser fan: OFF
Stop
0A
Condenser fan: 50%
Middle speed
0B
Condenser fan: 100%
High speed
10
F.Air mix dumper motor: 0%
Opening angle: Approximately 0% (MAX
COOL)
11
F.Air mix dumper motor: 50%
Opening angle: Approximately 50%
12
F.Air mix dumper motor: 100%
Open angle: Approximately 100% (MAX
COOL)
13
R.Air mix dumper motor: 0% <Vehicles with
rear heater, rear cooler or dual automatic A/C>
Opening angle: Approximately 0% (MAX
COOL)
14
R.Air mix dumper motor: 50% <Vehicles with
rear heater, rear cooler or dual automatic A/C>
Opening angle: Approximately 50%
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-187
CHECK AT A/C-ECU TERMINALS
M1552010300668
15
R.Air mix dumper motor: 100% <Vehicles with
rear heater, rear cooler or dual automatic A/C>
Open angle: Approximately 100% (MAX
COOL)
20
Air outlet c/o dumper: FACE
Air outlet at FACE position
21
Air outlet c/o dumper: Bi-Level
Air outlet at FACE/FOOT position
22
Air outlet c/o dumper: FOOT
Air outlet at FOOT position
23
Air outlet c/o dumper: DEF/FOOT
Air outlet at DEF/FOOT position
24
Air outlet c/o dumper: DEF
Air outlet at DEF position
30
In/out changeover dumper: Recirc
Moved to recirculation-side
31
In/out changeover dumper: Fresh
Moved to outside air-side
40
Rear defogger switch: OFF
Rear window defogger OFF
41
Rear defogger switch: ON
Rear window defogger ON
42
PTC heater relay: OFF <Vehicles with rear
heater or dual automatic A/C>
PTC heater OFF
43
PTC heater relay: ON <Vehicles with rear
heater or dual automatic A/C>
PTC heater ON (air outlet at FACE or
DEF position, not operate with blower
OFF)
50
Idle up request: OFF
Idle rpm (not operate with compressor
ON)
51
Idle up request: low load
Idle up with low load rpm
52
Idle up request: high lode
Idle up with high load rpm
Item No.
Check items
Drive content
5152 5354 5556 57585960 61
62 6364656667686970 7172
1 2 3 4 5 6 7 8 9 10 111213
20
19
18
17
16
15
14
2122 2324 25 26
313233 3435 36 37 38
39 4041 42 43 44 4546
AC303234
<C-08>
<C-11>
<C-09>
AB
Terminal
No.
Check items
Check conditions
Normal conditions
1
Sensor earth
Always
0 V
2
Front power transistor
(DRAIN)
Air volume control dial: Maximum
air volume (Preset temperature
18
°C)
0
− 2 V
3
Front power transistor (GATE) Air volume control dial: Maximum
air volume (Preset temperature
18
°C)
System voltage
4
Back-up power supply
Always
System voltage
5
ACC power supply
Ignition switch: ACC
System voltage
6
IG2 power supply
Ignition switch: IG2
System voltage
7
Earth
Always
0 V
8~10
−
−
−
11
Compressor relay input
Compressor relay: ON
System voltage
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-188
12
Rear window defogger relay
Rear window defogger relay: ON
0
− 1 V
13
PTC heater switch indicator
<Vehicles with rear heater or
dual automatic A/C>
PTC heater switch: ON
0
− 1 V
PTC switch: OFF
0 V
14
Sensor power supply:
Ignition switch: IG2
5 V
15
Rear temperature control
lever <Vehicles with dual
automatic A/C>
Rear temperature control lever
MAX HOT position
0 V
16, 17
−
−
−
18
Interior temperature sensor
Sensor probe temperature: 25
°C
(4k
Ω)
2.1
− 2.7 V
19
Air thermo sensor
Sensor probe temperature: 25
°C
(4k
Ω)
2.1
− 2.7 V
20
Front air mix damper motor
(Potentiometer input)
Front air mix damper motor MAX
HOT position
1.2
− 1.6 V
21
Air outlet changeover damper
motor (Potentiometer input)
DEF position
0.5
− 0.8 V
22
Rear air mix damper motor
(Potentiometer input)
<Vehicles with dual automatic
A/C>
Rear air mix damper motor MAX
HOT position
0.8
− 1.2 V
23
Solar sensor input
Brightness 0 lux
5 V
Brightness 100000 lux or more
0 V
24
Ambient temperature sensor
Sensor probe temperature 25
°C
(1.5k
Ω)
2.1
− 2.7 V
25
A/C pressure sensor input
Refer to
26
Heat switch <Vehicles with
dual automatic A/C>
Ignition switch: IG2
Heater switch ON
System voltage
31
Front air mix damper motor
(COOL)
When the front air conditioner is
moved to the COOL position
System voltage
When the front air conditioner is
moved to the HOT position
0
− 1 V
32
Front air mix damper motor
(HOT)
When the front air conditioner is
moved to the HOT position
System voltage
When the front air conditioner is
moved to the COOL position
0
− 1 V
33
Air outlet changeover damper
motor (FACE)
When moving toward FACE
position
System voltage
When moving toward DEF position 0
− 1 V
34
Air outlet changeover damper
motor (DEF)
When moving toward DEF position System voltage
When moving toward FACE
position
0
− 1 V
Terminal
No.
Check items
Check conditions
Normal conditions
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