Mitsubishi Grandis. Manual — part 281
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-9
B1055
Motor drive system for rear air mix damper <vehicles
with dual automatic A/C>
−
B1061
Potentiometer system for air outlet switching damper
(short to power supply) <LHD>
Moved to DEF
position
Potentiometer system for air outlet switching damper
(short to power supply) <RHD>
B1062
Potentiometer system for air outlet switching damper
(short to earth or open circuit) <LHD>
Potentiometer system for air outlet switching damper
(short to earth or open circuit) <RHD>
B1065
Motor drive system for air outlet switching damper
−
U1073
Bus off error
−
U1100
Engine-related CAN time-out
−
U1109
ETACS related CAN communication time-out
−
U1113
Multi-centre display-related CAN time-out
−
U1120
Engine-related failure data
−
Code No.
Diagnostic item
Reference page Service data
display
contents when
diagnosis code
is set
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-10
DIAGNOSTIC TROUBLE CODE
PROCEDURES
Code No. B1001,B1002: Interior temperature sensor system
COMMENTS ON TROUBLE SYMPTOM
This code is set when the interior temperature sensor
circuit is open (Code No.B1002) or is short (Code
No.B1001).
POSSIBLE CAUSES
• Malfunction of the interior temperature 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 01: Inside temperature sensor
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Go to Step 2.
A/C-ECU
INTERIOR
TEMPERATURE
SENSOR
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
Interior Temperature Sensor Circuit
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-11
Step 2. Connector check: C-106 A/C-ECU
connector and C-26 interior temperature 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 18) and C-26
interior temperature sensor connector (terminals
1 and 2).
• 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
AB
Connectors: C-26, C-106 <LHD>
Harness side
2 1
C-26
C-106
C-26
C-106
Harness side
AC310632 AB
Connectors: C-26, C-106 <RHD>
Harness side
2 1
C-26
C-106
C-26
C-106
Harness side
AC310614
AB
Connectors: C-26, C-106 <LHD>
Harness side
2 1
C-26
C-106
C-26
C-106
Harness side
AC310632 AB
Connectors: C-26, C-106 <RHD>
Harness side
2 1
C-26
C-106
C-26
C-106
Harness side
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-12
Step 4. Check the interior temperature sensor.
Refer to
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Replace the interior 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. B1011,B1012: Ambient temperature sensor system
COMMENTS ON TROUBLE SYMPTOM
This code is set when the ambient temperature
sensor circuit is open (Code No.B1012) or is short
(Code No.B1011).
POSSIBLE CAUSES
• Malfunction of the ambient temperature sensor
• Damaged the wiring harness and 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 02: Ambient temperature sensor
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Go to Step 2.
A/C-ECU
AMBIENT
TEMPERATURE
SENSOR
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
Ambient Temperature Sensor Circuit
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