Mitsubishi L200. Manual — part 890
TROUBLESHOOTING
AUTOMATIC AIR CONDITIONER
55B-89
STEP 6. Replace the photo sensor and recheck
the trouble symptom
Check that the A/C works normally.
Q: Is the check result normal?
YES :
This diagnosis is complete.
NO :
Replace the automatic A/C control panel (A/
C-ECU).
SERVICE DATA REFERENCE TABLE
M1554005101098
Item No.
Check items
Check contents
15
Illumination
Displays the illumination condition of the heater control
panel.
19
Ambient temperature sensor
Displays the detected temperature of the Ambient
temperature sensor.
20
Air thermo sensor
Displays the detected temperature of the air thermo
sensor.
21
Interior temperature sensor
Displays the detected temperature of the Interior
temperature sensor.
23
Temperature setting
Displays the set temperature.
24
Engine coolant TEMP. sensor
Displays the detected temperature of the Engine coolant
TEMP. sensor
27
A/C Compressor drive request
Displays the operation of the A/C compressor.
28
Air conditioner switch
Displays the condition of the A/C switch.
30
PTC heater drive request
Displays the condition of the PTC heater drive request
signal.
34
Idle up request
Displays the idle-up condition.
45
In/out select damp poten (target)
Displays the target position of the inside/outside air
selection damper.
46
In/out select damp potentiometer
Displays the condition of inside/outside air selection
damper control motor.
55
Air outlet c/o potentiometer
Displays the set air outlet position.
56
Air outlet c/o potentio. (Target)
Displays the target position of the mode selection
damper.
60
Rear defogger switch
Displays the condition of the rear window defogger
switch.
63
Air mix potentiometer
Displays the condition of air mixing damper control
motor.
67
Photo sensor
Displays the volume of insolation.
68
Front blower fan
Displays the air volume of the blower.
69
Front blower fan (Target)
Displays the target value of the blower motor.
72
Rear defogger relay
Displays the condition of the rear window demister
relay.
ACTUATOR TEST TABLE
M1554005200393
Item No.
Check items
Drive content
1
A/C compressor drive*
OFF
ON
TROUBLESHOOTING
AUTOMATIC AIR CONDITIONER
55B-90
NOTE: *: Drive at the engine operation
CHECK AT THE A/C-ECU TERMINALS
M1552010302749
42
35
39
38
3132
4041
3334
44
43
3637
AC509349AC
C-43
C-44
2
idle up request*
OFF
ON
4
Rear defogger
OFF
ON
5
In/out select damper
Fresh
Recirc
6
Air mixing damper motor
0% (MAX COOL)
− 100% (MAX COOL)
7
Front blower fan
0 V (OFF)
− 12 V (MAX)
8
Air outlet c/o dumper
AUTO
bi-level 1
bi-level 2
bi-level 3
bi-level 4
bi-level 5
DEF
DEF/FOOT 1
DEF/FOOT 2
DEF/FOOT 3
DEF/FOOT 4
DEF/FOOT 5
FACE
FOOT
9
PTC heater drive request
OFF
ON
Item No.
Check items
Drive content
Terminal No.
Check items
Check conditions
Normal conditions
1
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
2
Mode selection
damper control
motor (FACE)
When moving toward FACE
position
System voltage
When moving toward DEF position 0
− 1 V
TROUBLESHOOTING
AUTOMATIC AIR CONDITIONER
55B-91
3
Outside/Inside air
selection damper
control motor
When the damper is moved to the
inside air recirculation position
1 V or less
When the damper is moved to the
fresh air position
System voltage
4
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
1 V or less
5
Output to the
engine-ECU
A/C stopped
1 V or less
• A/C switch: ON
• Blower switch: ON
System voltage
6
Rear cooler switch
(front) indicator
Rear cooler switch (front): ON
System voltage
Rear cooler switch (front): OFF
1.0 V or less
7
Input from diagnosis Ignition switch: ON
Approximately 5 V
8
Battery power supply Always
System voltage
10
Battery power supply IG2: ON
System voltage
11
Communication with
combination meter
−
−
12
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
13
Mode selection
damper control
motor (DEF)
When moving toward DEF position System voltage
When moving toward FACE
position
0
− 1 V
14
Rear defogger relay IG2: ON
System voltage
15
Rear cooler relay
IG2: ON
System voltage
16
Output to the
engine-ECU (A/C2)
When the A/C is under low load
System voltage
When the A/C is under high load
1 V or less
18
Front blower relay
IG2: ON
System voltage
22
Earth
Always
1.0 V or less
32
Air mixing damper
control motor and
potentiometer input
MAX COOL position
Approximately 1
33
Mode selection
damper control
motor and
potentiometer input
DEF position
0.5
− 0.8 V
34
Sensor power
supply:
Ignition switch: IG2
5 V
35
Power transistor
(DRAIN)
Air volume control dial: Maximum
air volume (Preset temperature
18
°C)
0
− 2 V
Terminal No.
Check items
Check conditions
Normal conditions
HEATER CONTROL UNIT
AUTOMATIC AIR CONDITIONER
55B-92
HEATER CONTROL UNIT
REMOVAL AND INSTALLATION
M1554014700750
AC809580
1
3
2
AB
36
Power transistor
(GATE)
Air volume control dial: Maximum
air volume (Preset temperature
18
°C)
System voltage
37
Tail lamp relay
Tail lamp: ON
System voltage
38
Sensor earth
Always
1 V or less
39
Air thermo sensor
Sensor probe temperature 25
°C
(1.5k
Ω)
2.2 V
40
Interior temperature
sensor
Sensor probe temperature: 25
°C
(4k
Ω)
2.1
− 2.7 V
41
Photo sensor input
−
−
43
Rear cooler switch
(front)
Rear cooler switch (front): ON
System voltage
Rear cooler switch (front): OFF
1 V or less
44
Earth
Always
1 V or less
Terminal No.
Check items
Check conditions
Normal conditions
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст