Mitsubishi Lancer (4A9 engine). Manual — part 282
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55A-9
DIAGNOSIS CODE CHART
M1554004901961
<VEHICLES WITHOUT A/C>
Code No.
Diagnostic item
Reference page Service data
display
contents when
diagnosis code
is set
B1034 (set by
ETACS-ECU)
Ambient temperature sensor system (short
circuit)
20
°C
B1035 (set by
ETACS-ECU)
Ambient temperature sensor system (open
circuit)
B1031
Fin thermo sensor system (short circuit)
<Vehicles without A/C>
Air recirculation
position: Interior
temperature
Fresh air
position: Fresh
air + 10
°C
B1032
Fin thermo sensor system (open circuit)
<Vehicles without A/C>
B1000
Communication error with control panel
<Vehicles without A/C>
−
B1018
Temperature control dial SW error <Vehicles
without A/C>
−
B1003
Mode dial SW error <Vehicles without A/C>
−
B1021
Fan dial SW error <Vehicles without A/C>
−
B2214
Control panel failure <Vehicles without A/C>
−
U1415
Coding Not Completed
−
U0019
Bus off (CAN-B)
−
U0141
ETACS-ECU CAN time-out
−
U0151
SRS CAN time-out
−
U0155
Meter CAN time-out
−
U0168
WCM CAN time-out
−
U0184
Audio CAN time-out
−
NOTE: Note that diagnosis code Nos. B1034 and
B1035 will be set by the ETACS-ECU separately.
<VEHICLES WITH A/C>
Code No.
Diagnostic item
Reference page Service data
display
contents when
diagnosis code
is set
B1034 (set by
ETACS-ECU)
Ambient temperature sensor system (short
circuit)
20
°C
B1035 (set by
ETACS-ECU)
Ambient temperature sensor system (open
circuit)
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55A-10
NOTE: Note that diagnosis code Nos. B1034 and
B1035 will be set by the ETACS-ECU separately.
B1031
Fin thermo sensor system (short circuit)
<Vehicles with A/C>
Air recirculation
position: Interior
temperature
Fresh air
position: Fresh
air + 10
°C
B1032
Fin thermo sensor system (open circuit)
<Vehicles with A/C>
B1000
Communication error with control panel
<Vehicles with A/C>
−
B1018
Temperature control dial SW error <Vehicles with
A/C>
−
B1003
Mode dial SW error <Vehicles with A/C>
−
B1021
Fan dial SW error <Vehicles with A/C>
−
B1079
A/C refrigerant leaks
−
B2214
Control panel failure <Vehicles with A/C>
−
U1415
Coding Not Completed
−
U0019
Bus off (CAN-B)
−
U0141
ETACS-ECU CAN time-out
−
U0151
SRS CAN time-out
−
U0155
Meter CAN time-out
−
U0168
WCM CAN time-out
−
U0184
Audio CAN time-out
−
Code No.
Diagnostic item
Reference page Service data
display
contents when
diagnosis code
is set
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55A-11
DIAGNOSIS CODE PROCEDURES
Code No.B1034: Ambient temperature sensor system (short circuit)
Code No.B1035: Ambient temperature sensor system (open circuit)
Ambient Temperature Sensor Circuit
ETACS-ECU
AMBIENT
TEMPERATURE
SENSOR
ANALOG
INTERFACE
CIRCUIT
Wire colour code
B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Grey R : Red P : Pink V : Violet PU : Purple SI : Silver
AC802248
AC612690
AH
Connectors: A-41
A-41 (B)
AC612709
AN
Connector: C-312 <LHD>
ETACS-ECU
AC612717
AK
Connector: C-312 <RHD>
ETACS-ECU
COMMENTS ON TROUBLE SYMPTOM
This code is set when the ambient temperature sen-
sor circuit is short (Code No.B1034) or is open (Code
No.B1035).
POSSIBLE CAUSES
• Malfunction of the ambient temperature sensor
• Damaged wiring harness or connectors
• Malfunction of the ETACS-ECU
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55A-12
DIAGNOSIS PROCEDURE
STEP 1. Connector check: A-41 ambient
temperature sensor connector and C-312 ETACS-
ECU connector
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Repair the connector.
STEP 2. Check the wiring harness between A-41
ambient temperature sensor connector
(terminals 1 and 2) and C-312 ETACS-ECU
connector (terminals 14 and 7).
• Check the sensor signal line and earth line for
open or short circuit.
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Repair the connector.
STEP 3. Check the ambient temperature sensor
Refer to .
Q: Is the check result normal?
YES :
Go to Step 4.
NO :
Replace the ambient temperature sensor.
STEP 4. Check whether the diagnosis code is
reset
Q: Is the diagnosis code set?
YES :
Replace the ETACS-ECU.
NO :
The trouble can be an intermittent
malfunction (Refer to GROUP 00, How to
Cope with Intermittent Malfunction ).
Code No.B1031: Fin thermo Sensor system (short circuit) <Vehicles without A/C>
Code No.B1032: Fin thermo Sensor system (open circuit) <Vehicles without A/C>
Fin Thermo Sensor Circuit
FIN THERMO
SENSOR
HEATER
CONTROL
UNIT
Wire colour code
B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Grey R : Red P : Pink V : Violet PU : Purple SI : Silver
AC801264
AC612706
Connectors: C-59, C-118 <LHD>
BO
C-59 (B)
C-118
COMMENTS ON TROUBLE SYMPTOM
This code is set when the fin thermo sensor circuit is
short (Code No.B1031) or is open (Code No.B1032).
PROBABLE CAUSES
• Malfunction of the fin thermo sensor
• Damaged wiring harness or connectors
• Malfunction of the heater control unit
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