Mitsubishi Grandis. Manual — part 290
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-45
SYMPTOM PROCEDURES
INSPECTION PROCEDURE 1: Communication with the MUT-III is not possible.
COMMENTS ON TROUBLE SYMPTOM
If communication with all other systems is not
possible, there is a high possibility that there is a
malfunction of the diagnosis line. If only the A/C
system can not communicate with the MUT-III, the
A/C-ECU may be defective.
POSSIBLE CAUSES
• Malfunction of the A/C-ECU
ENGINE-ECU <M/T>
OR
ENGINE-ECU <A/T>
DIAGNOSIS
CONNECTOR
A/C-ECU
Wire colour code
B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Gray R : Red P : Pink V : Violet
NOTE
: LHD
: RHD
FRONT SIDE
A/C-ECU CAN-BAS Line Circuit
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-46
DIAGNOSIS
Step 1. Check that Engine-A/T-ECU
communicates with the MUT-III
Use the MUT-III to confirm that it communicates with
the engine-A/T-ECU.
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Diagnose the MPI system. Refer to GROUP
13A
Step 2. MUT-III CAN bus diagnostics
Use the MUT-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES <RHD> :
INSPECTION PROCEDURE 26:
Refer to A/C-ECU power supply system
<LHD>
YES <LHD> :
INSPECTION PROCEDURE 27:
Refer to A/C-ECU power supply system
<RHD>
NO :
Repair the CAN bus line (Refer to GROUP
54D - Troubleshooting
).
INSPECTION PROCEDURE 2: Cool air does not come
CIRCUIT OPERATION
If the blower air temperature can not be cool when
turning A/C switch ON and lowering the preset
temperature, inadequate refrigerant quantity,
sensors, harness or connectors may be suspected.
POSSIBLE CAUSES
• Damaged the wiring harness or connectors
Step 1. Check the blower operation
(1) Turn the ignition switch to the ON position.
(2) Blower knob: Other than OFF
(3) Check that the air comes out of the blower.
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Refer to Inspection Procedure 3 " Front
blower does not work
".
Step 2. Check the A/C compressor operation
Check that the compressor operates under the
following conditions.
• Engine operation
• Air conditioner switch: ON
• Temperature control dial: 18°C (MAX COOL)
Q: Is the check result normal?
YES :
Go to Step 3.
NO <LHD> :
Refer to Inspection Procedure 7 "
Front compressor does not work
<LHD>
".
NO <RHD> :
Refer to Inspection Procedure 8 "
Front compressor does not work
<RHD>
".
Step 3. MUT-III diagnosis code
Check that the diagnosis code related to the air
conditioner is not set.
Q: Is the check result normal?
YES :
Go to Step 4.
NO :
Carry out the diagnosis code procedures.
Refer to
.
Step 4. MUT-III data list
Check that the following service data MUT-III display
contents are normal.
• Item 04: Pressure sensor
• Item 50: Front preset temperature
Q: Is the check result normal?
YES :
Go to Step 5.
NO <Item 04 is abnormal> :
Inspection Procedure
18: Refer to A/C pressure sensor system
<LHD> or Inspection Procedure
19: Refer to A/C pressure sensor system
<RHD>.
NO <Item 50 is abnormal> :
Replacement of the
A/C-ECU
STEP 5. Refrigerant level check
Check that the refrigerant level is adequate. Refer to
Q: Is the check result normal?
YES :
Intermittent malfunction. (Refer to GROUP
00
− How to Cope with Intermittent
Malfunction
.)
NO :
Charge or remove the refrigerant level.
Refer to
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-47
INSPECTION PROCEDURE 3: The front blower does not work
COMMENTS ON TROUBLE SYMPTOM
If the blower motor does not operate, the blower
motor circuit system may be defective.
POSSIBLE CAUSES
• Malfunction of the front blower motor (blower
linear controller).
Wire colour code
B : Black LG : Light green G : Green L : Blue
W : White Y : Yellow SB : Sky blue BR : Brown
O : Orange GR : Gray R : Red P : Pink V : Violet
FUSIBLE
LINK
30
IGNITION
SWITCH (IG2)
FRONT
BLOWER
RELAY
A/C-ECU
A/C-ECU
FRONT BLOWER
MOTOR
FRONT
POWER
TRANSISTOR
Blower Motor Circuit
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-48
• Malfunction of the automatic air conditioner
control panel (A/C-ECU)
• Damaged the wiring harness or connectors
DIAGNOSIS
Step 1. Check the operation of the heater control
panel
Check that the A/C switch, rear window defogger
switch and outside/inside air selection switch can
operate.
Q: Is the check result normal?
YES <RHD> :
INSPECTION PROCEDURE 26:
Refer to A/C-ECU power supply system
<LHD>
.
YES <LHD> :
INSPECTION PROCEDURE 27:
Refer to A/C-ECU power supply system
<RHD>
.
NO :
Repair the CAN bus line (Refer to GROUP
54D - Troubleshooting
Step 2. MUT-III actuator test
Carry out the actuator test.
• Item 01, 02, 03: Front blower fan
Q: Does the blower motor work normally?
YES :
Go to Step 3.
NO :
Go to Step 4.
Step 3. Recheck the trouble symptom
Q: Is the check result normal?
YES :
Intermittent malfunction. (GROUP 00
− How
to Cope with Intermittent Malfunction
)
NO :
Replace the air conditioner control panel
(A/C-ECU) or the blower motor (blower
linear controller).
Step 4. Connector check: C-209 front blower
relay connector
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Repair the connector.
Step 5. Check the blower relay.
Refer to GROUP 55, On-vehicle Service
− Power
relay check
.
Q: Is the blower relay in good condition?
YES :
Go to Step 6.
NO :
Replace the blower relay.
AC310623
Connector: C-209 <LHD>
AD
3
4
5
1
2
Junction block side
Junction block (Front view)
AC310618
Connector: C-209 <RHD>
AD
3
4
5
1
2
Junction block side
Junction block (Front view)
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