Mitsubishi Grandis. Manual — part 289
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-41
YES :
Go to Step 4
NO :
Go to Step 5
Step 4. Check whether the diagnosis code is
reset.
Recheck if the diagnosis code is set.
1. Erase the diagnosis code.
2. Ignition switch: LOCK (OFF) to ON
3. Check if the diagnosis code is set.
Q: Is the diagnosis code set?
YES :
Replace the ETACS-ECU, and then go to
Step 6 .
NO :
A poor connection, open circuit or other
intermittent malfunction in the CAN bus line
between the ETACS-ECU and the
A/C-ECU. (Refer to GROUP 00
− How to
Cope with Intermittent Malfunction
Step 5. Check whether the diagnosis code is
reset.
Recheck if the diagnosis code is set.
1. Erase the diagnosis code.
2. Ignition switch: LOCK (OFF) to ON
3. Check if the diagnosis code is set.
Q: Is the diagnosis code set?
YES :
Replace the A/C-ECU, and then go to Step
NO :
A poor connection, open circuit or other
intermittent malfunction in the CAN bus line
between the ETACS-ECU and the
A/C-ECU. (Refer to GROUP 00
− How to
Cope with Intermittent Malfunction
.))
Step 6. Check whether the diagnosis code is
reset.
Recheck if the diagnosis code is set.
1. Erase the diagnosis code.
2. Ignition switch: LOCK (OFF) to ON
3. Check if the diagnosis code is set.
Q: Is the diagnosis code set?
YES :
Return to Step 1.
NO :
The procedure is complete.
Code No.U1113 Multi-centre display CAN communication time-out
CAUTION
If diagnosis code No. U1113 is set in the
A/C-ECU, diagnose the CAN main bus line.
CAUTION
Whenever the ECU is replaced, ensure that the
communication circuit is normal.
TROUBLE JUDGMENT
The A/C-ECU receives air conditioner
operation-related signal from the multi-centre display
via the CAN bus lines. If the A/C-ECU can not
receive the air conditioner operation-related signal at
all on the multi-centre display, diagnosis code
No.U1113 will be set.
COMMENTS ON TROUBLE SYMPTOM
Current trouble
• Connector(s) or wiring harness in the CAN bus
lines between the multi-centre display and the
A/C-ECU, the power supply system to the
multi-centre display, the multi-centre display
itself, or the A/C-ECU may be defective.
Past trouble
• Carry out diagnosis with particular emphasis on
connector(s) or wiring harness in the CAN bus
lines between the multi-centre display and the
A/C-ECU, and the power supply system to the
multi-centre display. For diagnosis procedures,
refer to "How to cope with past trouble" (Refer to
GROUP 00
− How to Use
Troubleshooting/Inspection Service Points
NOTE: For a past trouble, you can not find it by the
MUT-III CAN bus diagnostics even if there is any
failure in CAN bus lines. In this case, refer to
GROUP 00
−
How to Cope with Intermittent
Malfunctions
and check the CAN bus
lines. You can narrow down the possible cause of
the trouble by referring to the diagnosis code,
which is set regarding the CAN
communication-linked ECUs (Refer to GROUP
54D
−
Explanation about the MUT-III CAN bus
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-42
CAUTION
If the ignition switch is turned to the ON position
without starting the engine, the diagnosis code
U1113 (past trouble) may be set to the A/C-ECU
after three minutes.
POSSIBLE CAUSES
• Damaged harness wires and connectors
• Malfunction of multi-centre display
• Malfunction of the A/C-ECU
Step 1. MUT-III CAN bus diagnostics
Use the MUT-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES :
Go to Step 2
NO :
Repair the CAN bus lines. (Refer to GROUP
54D
− Troubleshooting
completion, go to Step 6.
Step 2. MUT-III Diagnosis code of other systems
Check that the multi-centre display unit sets a
diagnosis code.
Q: Is the diagnosis code set?
YES :
Diagnose the multi-centre display. Refer to
NO :
Go to Step 3
Step 3. MUT-III Diagnosis code of other systems
Check if a diagnosis code, which relates to CAN
communication-linked systems below, is set.
• ETACS
15: Multi-centre display-related time-out diagnosis
code
Q: Is the diagnosis code set?
YES :
Go to Step 4
NO :
Go to Step 5
Step 4. Check whether the diagnosis code is
reset.
Recheck if the diagnosis code is set.
1. Erase the diagnosis code.
2. Ignition switch: LOCK (OFF) to ON
3. Check if the diagnosis code is set.
Q: Is the diagnosis code set?
YES :
Replace the multi-centre display, and then
go to Step 6 .
NO :
A poor connection, open circuit or other
intermittent malfunction in the CAN bus line
between the multi-centre display and the
A/C-ECU. (Refer to GROUP 00
− How to
Cope with Intermittent Malfunction
Step 5. Check whether the diagnosis code is
reset.
Recheck if the diagnosis code is set.
1. Erase the diagnosis code.
2. Ignition switch: LOCK (OFF) to ON
3. Check if the diagnosis code is set.
Q: Is the diagnosis code set?
YES :
Replace the A/C-ECU, and then go to Step
NO :
A poor connection, open circuit or other
intermittent malfunction in the CAN bus line
between the multi-centre display and the
A/C-ECU. (Refer to GROUP 00
− How to
Cope with Intermittent Malfunction
Step 6. Check whether the diagnosis code is
reset.
Recheck if the diagnosis code is set.
1. Erase the diagnosis code.
2. Ignition switch: LOCK (OFF) to ON
3. Check if the diagnosis code is set.
Q: Is the diagnosis code set?
YES :
Return to Step 1.
NO :
The procedure is complete.
Code No.U1120 Engine-related CAN communication failure information
CAUTION
If diagnosis code No. U1120 is set in the
A/C-ECU, diagnose the CAN main bus line.
TROUBLE JUDGMENT
The A/C-ECU receives vehicle speed signal from the
engine-ECU <M/T> or the engine-A/T-ECU <A/T>
via CAN bus lines. If failure information is sent to the
vehicle speed signal, diagnosis code U1120 will be
set.
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-43
COMMENTS ON TROUBLE SYMPTOM
Current trouble
• The vehicle speed sensor, A/C-ECU,
engine-ECU <M/T> or engine-A/T-ECU <A/T>
may be defective.
Past trouble
• Carry out diagnosis with particular emphasis on
connector(s) or wiring harness between the
engine-ECU <M/T> or engine-A/T-ECU <A/T>
and the vehicle speed sensor. For diagnosis
procedures, refer to "How to treat past trouble"
(Refer to GROUP 00
− How to Use
Troubleshooting/Inspection Service Points
POSSIBLE CAUSES
• Damaged harness wires and connectors
• Malfunction of the engine-A/T-ECU
• Malfunction of the A/C-ECU
Step 1. MUT-III CAN bus diagnostics
Use the MUT-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Repair the CAN bus lines. (Refer to GROUP
54D
− Troubleshooting
completion, go to Step 6.
Step 2. MUT-III Diagnosis code of other systems
Check whether the engine-related diagnosis code is
set.
Q: Is the diagnosis code set?
YES :
Diagnose the engine control system. Refer
to
NO :
Go to Step 3.
Step 3. MUT-III Diagnosis code of other systems
Check if a diagnosis code, which relates to CAN
communication-linked systems below, is set.
• Combination meter
U1120: Diagnosis code of engine-related failure
information
Q: Is the diagnosis code set?
YES :
Go to Step 4.
NO :
Go to Step 5.
Step 4. MUT-III diagnosis code
Recheck if the diagnosis code is set.
1. Erase the diagnosis code.
2. Ignition switch: LOCK (OFF) to ON
3. Check if the diagnosis code is set.
Q: Is the diagnosis code set?
YES :
Replace the engine-ECU <M/T> or the
engine-A/T-ECU <A/T>, go to Step 6 .
NO :
A poor connection, open circuit or other
intermittent malfunction between the
engine-ECU <M/T> or the engine-A/T-ECU
<A/T> and the vehicle speed sensor. (Refer
to GROUP 00, How to Cope with
Intermittent Malfunction
.)
Step 5. MUT-III diagnosis code
Recheck if the diagnosis code is set.
1. Erase the diagnosis code.
2. Ignition switch: LOCK (OFF) to ON
3. Check if the diagnosis code is set.
Q: Is the diagnosis code set?
YES :
Replace the A/C-ECU, and then go to Step
NO :
A poor connection, open circuit or other
intermittent malfunction between the
engine-A/T-ECU <A/T> and the vehicle
speed sensor. (Refer to GROUP 00, How to
Cope with Intermittent Malfunction
Step 6. MUT-III diagnosis code
Recheck if the diagnosis code is set.
1. Erase the diagnosis code.
2. Ignition switch: LOCK (OFF) to ON
3. Check if the diagnosis code is set.
Q: Is the diagnosis code set?
YES :
Return to Step 1.
NO :
The procedure is complete.
TROUBLE SYMPTOM CHART
M1554005000247
Trouble symptom
Inspection
procedure
number
Reference
page
Communication with the MUT-III is not possible.
1
Cool air does not come
2
The front blower does not work
3
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-44
The blower air volume cannot be changed
4
The inside/outside air changeover is impossible. <LHD>
5
The inside/outside air changeover is impossible. <RHD>
6
The compressor does not work <LHD>
7
The compressor does not work <RHD>
8
The outlet air temperature can not be changed even if the amount of solar
radiation changes
9
The PTC heater does not work <LHD>
10
The PTC heater does not work <RHD>
11
The rear window defogger does not work.
12
The A/C indicator flashes
13
Rear blower does not work <Vehicle with rear heater or rear cooler>
14
Rear blower does not work <vehicles with dual automatic A/C>
15
Air volume of rear blower cannot be changed
16
The temperature of rear air conditioner cannot be controlled <vehicles with
dual automatic A/C>
17
A/C pressure sensor system <LHD>
18
A/C pressure sensor system <RHD>
19
Rear fan switch system <LHD>
20
Rear fan switch system <RHD>
21
Rear blower motor power supply system <LHD>
22
Rear blower motor power supply system <RHD>
23
PTC heater switch system <LHD>
24
PTC heater switch system <RHD>
25
A/C-ECU power supply system <LHD>
26
A/C-ECU power supply system <RHD>
27
Trouble symptom
Inspection
procedure
number
Reference
page
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