Mitsubishi Colt Ralliart. Manual — part 525
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55A-8
Code No. B1021,B1022: Air thermo sensor system
AIR THERMO
SENSOR
COMBINATION
METER
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
SENSOR CIRCUIT
METER AND A/C-ECU
Air Thermo Sensor Circuit
DIAGNOSIS CODE SET CONDITION
This code is set when the air thermo sensor circuit is
open (Code No.B1022) or is short (Code No.B1021).
POSSIBLE CAUSES
• Malfunction of the air thermo sensor
• Damaged the wiring harness or connectors
• Malfunction of the combination meter (meter and
A/C-ECU)
DIAGNOSIS PROCEDURE
Step 1. M.U.T.-III data list
Check that the following service data display con-
tents are normal. (Refer to
.)
• Item 03: Air thermo sensor
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Go to Step 2.
Step 2. Connector check: B-15 combination
meter connector and B-08 air thermo sensor
connector
AC401053
Connector: B-08
AE
Harness side
AC401055
AE
Connector: B-15
B-15 (B)
Harness side
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Repair the connector.
Main
Index
Group
TOC
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55A-9
Step 3. Check the wiring harness between B-15
combination meter connector (terminals 9 and
15) and B-08 air thermo sensor connector
(terminals 1 and 2).
AC401053
Connector: B-08
AE
Harness side
AC401055
AE
Connector: B-15
B-15 (B)
Harness side
• Check the sensor signal line and earth line for
open or short circuit.
Q: Is the check result normal?
YES :
Go to Step 4.
NO :
Repair the wiring harness.
Step 4. Check the air thermo sensor.
Refer to
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Replace the air thermo sensor.
Step 5. Check whether the diagnosis code is
reset.
Q: Is the diagnosis code set?
YES :
Replace the combination meter (meter and
A/C-ECU).
NO :
The trouble can be an intermittent
malfunction (Refer to GROUP 00, How to
Cope with Intermittent Malfunction
Code No. B1082 Automatic/manual types abnormal error
DIAGNOSIS CODE SET CONDITION
This diagnosis code is set when the heater control
specification does not meet the combination meter
(meter and A/C-ECU) specification.
POSSIBLE CAUSES
• Malfunction of the heater control assembly
• Malfunction of the combination meter (meter and
A/C-ECU)
DIAGNOSIS PROCEDURE
STEP 1. Replace the heater control
Q: Is the check result normal?
YES :
This diagnosis is complete.
NO :
Replace the combination meter (meter and
A/C-ECU).
Main
Index
Group
TOC
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55A-10
TROUBLE SYMPTOM CHART
M1554005000388
Trouble symptom
Inspection procedure
number
Reference page
Communication with the M.U.T.-III is not possible
1
The air conditioner does not work at all.
2
Cool air does not come
3
The blower does not work
4
The blower air volume cannot be changed
5
The inside/outside air changeover is impossible
6
The A/C compressor does not work
7
The rear window defogger does not work
8
The A/C indicator flashes
9
A/C pressure sensor system
10
SYMPTOM PROCEDURES
Inspection Procedure 1: Communication with the M.U.T.-III is not possible
Inspection Procedure 2: The air conditioner does not work at all.
COMMENTS ON TROUBLE SYMPTOM
If communication with all other systems is not possi-
ble, there is a high possibility that there is a malfunc-
tion of the diagnosis line. If only the A/C system can
not communicate with the M.U.T.-III, the combination
meter (meter and A/C-ECU) may be defective.
POSSIBLE CAUSE
Malfunction of the combination meter (meter and
A/C-ECU)
DIAGNOSIS PROCEDURE
Step 1. Check the communication with
combination meter
Q: Can the M.U.T.-III communicate with the
combination meter?
YES :
Inspection Procedure 3: Cool air does not
come
NO :
Diagnose the combination meter. Refer to
.
Main
Index
Group
TOC
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55A-11
Inspection Procedure 3: Cool air does not come
BLOWER
RELAY
BLOWER
SWITCH
COMBINATION
METER
A/C CONTROL CIRCUIT
METER AND
A/C-ECU
HEATER
CONTROL
ASSEMBLY
A/C
SWITCH
POWER
SOURCE
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
Blower switch and Heater Control Assembly Circuit
CIRCUIT OPERATION
If the blower air temperature can not be cool when
turning A/C switch ON and lowering the preset tem-
perature, inadequate refrigerant quantity, sensors,
harness or connectors may be suspected.
POSSIBLE CAUSES
Damaged the wiring harness or connectors
DIAGNOSIS PROCEDURE
Step 1. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-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
Main
Index
Group
TOC
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