Mitsubishi Grandis. Manual — part 324
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-181
Step 5. Check the wiring harness between C-106
A/C-ECU connector terminal No.5 and the
ignition switch (ACC).
NOTE:
Prior to the wiring harness inspection, check joint
connector C-01 and intermediate connector C-125,
and repair if necessary.
• Check the A/C-ECU power supply line for open
circuit.
Q: Is the check result normal?
YES :
The trouble can be an intermittent
malfunction (Refer to GROUP 00, How to
Cope with Intermittent Malfunction
NO :
Repair the wiring harness.
Step 6. Voltage measurement at C-106 A/C-ECU
connector.
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Measure the voltage between terminal 4 and
body earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 8.
NO :
Go to Step 7.
AC310632AK
Connectors: C-01, C-106 <RHD>
C-01
C-106
C-01
C-106
Harness side
AC310628AB
Connector: C-125 <RHD>
AC310631AB
Connectors: C-106 <RHD>
Harness side
AC310507
Connector C-106
(Harness side)
BK
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-182
Step 7. Check the wiring harness between C-106
A/C-ECU connector terminal No.4 and the fusible
link (26).
NOTE:
Prior to the wiring harness inspection, check joint
connector C-31 and intermediate connector C-125,
and repair if necessary.
• Check the rear fan switch power supply line for
open circuit.
Q: Is the check result normal?
YES :
The trouble can be an intermittent
malfunction (Refer to GROUP 00, How to
Cope with Intermittent Malfunction
NO :
Repair the wiring harness.
Step 8. Resistance measurement at the C-106
front power transistor connector.
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Continuity between terminal 7 and body earth
OK: 2
Ω or less
Q: Is the check result normal?
YES :
Replace the A/C-ECU.
NO :
Go to Step 9.
AC310632 AM
Connectors: C-31, C-106 <RHD>
C-31
C-106
C-31
C-106
Harness side
AC310628AB
Connector: C-125 <RHD>
AC310631AB
Connectors: C-106 <RHD>
Harness side
AC310506
Connector C-106
(Harness side)
AU
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-183
Step 9. Check the wiring harness between C-106
A/C-ECU connector terminal No.7 and body
earth.
NOTE: Prior to the wiring harness inspection, check
joint connector C-01, and repair if necessary.
• Check the A/C-ECU earth line for open circuit.
Q: Is the check result normal?
YES :
The trouble can be an intermittent
malfunction (Refer to GROUP 00, How to
Cope with Intermittent Malfunction
NO :
Repair the wiring harness.
SERVICE DATA REFERENCE TABLE
M1554005100192
AC310614
AG
Connectors: C-01, C-106 <LHD>
C-01
C-106
C-01
C-106
Harness side
Item No.
Check items
Inspection status
The display contents under
normal conditions
01
Inside temperature sensor
−
Interior temperature is the
same as MUT-III displayed
temperature
02
Outside temperature sensor −
Ambient temperature is the
same as MUT-III displayed
temperature
03
Air thermo sensor
−
Evaporator outlet temperature
is the same as MUT-III
displayed temperature
04
Pressure sensor
−
Refrigerant pressure is the
same as MUT-III displayed
pressure.
05
heater water temperature
sensor
−
The coolant temperature is
the same as MUT-III
displayed temperature
06
Photo sensor
−
The amount of solar radiation
is indirectly proportional to
MUT-III displayed voltage
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-184
10
F.Air mix potentiometer
Front air mix damper
position: MAX HOT
Approximately 100%
Front air mix damper
position: MAX COOL
Approximately 0%
11
F.Air mix potentiometer
(Target)
−
Display the target value for air
mix damper
12
R.Air mix potentiometer
<Vehicles with Dual
automatic A/C>
Rear air mix damper
position: MAX HOT
Approximately 100%
Rear air mix damper
position: MAX COOL
Approximately 0%
13
R.Air mix potentiometer
(Target) <Vehicles with Dual
automatic A/C>
−
Display the target value for air
mix damper
14
F.Air outlet c/o
potentiometer
Air outlet changeover
damper position: FACE
Opening angle: approximately
100%
Air outlet changeover
damper position: DEF
Opening angle: approximately
0%
15
F.Air outlet c/o
potentiometer (Target)
−
Display the target value for air
mix damper
16
In/out air damper motor
Outside/inside air selection
switch: ON
Inside air
Outside/inside air selection
switch: OFF
Outside air
20
Front blower fan
Air volume control dial:
Other than OFF
Display the rotation speed of
front blower motor
21
Front blower fan (Target)
Air volume control dial:
Other than OFF <Vehicles
with multi-centre display>
Display the target rotation
speed of front blower motor
22
Rear blower fan <Vehicles
with rear heater, rear cooler
or dual automatic A/C>
Rear fan switch: ON
Display the rotation speed of
rear blower motor
Rear air volume adjusting
switch: Other than OFF
23
Rear blower fan (Target)
<Vehicles with rear heater,
rear cooler or dual
automatic A/C>
Rear fan switch: ON
Display the target rotation
speed of rear blower motor
Rear air volume adjusting
switch: Other than OFF
30
Air conditioner switch
Compressor ON
ON
Compressor OFF
OFF
31
Rear fan SW (Front)
<Vehicles with rear heater,
rear cooler or dual
automatic A/C>
Rear fan switch: ON
ON
Rear fan switch: OFF
OFF
32
Rear control OFF switch
<Vehicles with rear heater,
rear cooler or dual
automatic A/C>
Rear air volume adjusting
switch: OFF
OFF controlled
Rear air volume adjusting
switch: Other than OFF
ON controlled
Item No.
Check items
Inspection status
The display contents under
normal conditions
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