Mitsubishi Grandis. Manual — part 282
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-13
Step 2. Connector check: A-28 ambient
temperature sensor connector and C-106
A/C-ECU connector
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Repair the connector.
AC310403
Connector: A-28 <LHD>
A-28 (B)
AB
Harness side
AC310398
Connector: A-28 <RHD>
A-28 (B)
AB
Harness side
AC310613
AB
Connector: C-106 <LHD>
Harness side
AC310631AB
Connectors: C-106 <RHD>
Harness side
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-14
Step 3. Check the wiring harness between A-28
ambient temperature sensor connector
(terminals 1 and 2) and C-106 A/C-ECU connector
(terminals 1 and 24).
AC310403
Connector: A-28 <LHD>
A-28 (B)
AB
Harness side
AC310398
Connector: A-28 <RHD>
A-28 (B)
AB
Harness side
AC310614
BD
Connectors: C-106, C-125 <LHD>
C-106
C-125
C-106
Harness side
C-125
AC310613
AB
Connector: C-106 <LHD>
Harness side
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-15
NOTE: Prior to the wiring harness inspection, check
intermediate connector C-125, and repair if
necessary.
• 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 ambient temperature sensor.
Refer to
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Replace the ambient temperature sensor.
Step 5. MUT-III diagnosis code
Q: Is the diagnosis code set?
YES :
Replace the automatic air conditioner
control panel (A/C-ECU)
NO :
The trouble can be an intermittent
malfunction (Refer to GROUP 00, How to
Cope with Intermittent Malfunction
Code No. B1021,B1022: Air thermo sensor system
COMMENTS ON TROUBLE SYMPTOM
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 automatic air conditioner
control panel (A/C-ECU)
DIAGNOSIS
Step 1. MUT-III data list
Check that the following service data display
contents 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.
AC310628AB
Connector: C-125 <RHD>
AIR THERMO
SENSOR
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
Air Thermo Sensor Circuit
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-16
Step 2. Connector check: C-106 A/C-ECU
connector and C-05 air thermo sensor connector
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Repair the connector.
Step 3. Check the wiring harness between C-106
A/C-ECU connector (terminals 1 and 19) and C-05
air thermo sensor connector (terminals 2 and 1).
• 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.
AC310614
AE
Connectors: C-05, C-106 <LHD>
Harness side
C-106
C-05
C-106
Harness side
C-05
AC310632 AC
Connectors: C-05, C-106 <RHD>
Harness side
C-05
C-106
C-05
C-106
Harness side
AC310614
AE
Connectors: C-05, C-106 <LHD>
Harness side
C-106
C-05
C-106
Harness side
C-05
AC310632 AC
Connectors: C-05, C-106 <RHD>
Harness side
C-05
C-106
C-05
C-106
Harness side
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