Mitsubishi L200. Manual — part 869
TROUBLESHOOTING
AUTOMATIC AIR CONDITIONER
55B-5
DIAGNOSIS CODE PROCEDURES
Code No.B1001,B1002: Interior temperature sensor system
Interior Temperature Sensor Circuit
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 : Grey R : Red P : Pink V : Violet PU : Purple
AC805734 AC
DIAGNOSIS CODE SET CONDITION
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 A/C control panel (A/
C-ECU)
B1061
Potentiometer system for mode selection damper (short
to power supply)
Moved to DEF
position
B1062
Potentiometer system for mode selection damper (short
to earth or open circuit)
B1065
Motor drive system for mode selection damper
−
Code No.
Diagnostic item
Reference page Service data
display
contents when
diagnosis code
is set
TROUBLESHOOTING
AUTOMATIC AIR CONDITIONER
55B-6
DIAGNOSIS PROCEDURE
STEP 1. Connector check: C-44 A/C-ECU
connector and C-48 interior temperature sensor
connector
AC509611BM
Harness side
Connector: C-44 <LHD>
AC509613 BZ
Connectors: C-48 <LHD>
C-48
Harness side
C-48
AC509932 BP
Harness side
Connectors: C-44, C-48 <RHD>
C-44
C-48
C-44
Harness side
C-48
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Repair the connector.
TROUBLESHOOTING
AUTOMATIC AIR CONDITIONER
55B-7
STEP 2. Check the wiring harness between C-44
A/C-ECU connector (terminals 40 and 38) and C-
48 interior temperature sensor connector
(terminals 2 and 1).
AC509611BM
Harness side
Connector: C-44 <LHD>
AC509613 BZ
Connectors: C-48 <LHD>
C-48
Harness side
C-48
AC509932 BP
Harness side
Connectors: C-44, C-48 <RHD>
C-44
C-48
C-44
Harness side
C-48
NOTE:
AC509611DV
Connector: C-138 <LHD>
C-138 (L)
AC509932DX
Connector: C-138 <RHD>
C-138 (L)
Prior to the wiring harness inspection, check joint
connector C-138, and repair if necessary.
• Check the sensor signal line and earth line for
open and short circuit.
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Repair the wiring harness.
STEP 3. Check the interior temperature sensor.
Refer to
Q: Is the check result normal?
YES :
Go to Step 4.
NO :
Replace the interior temperature sensor.
STEP 4. Check whether the diagnosis code is
reset.
Q: Is the check result normal?
YES :
The trouble can be an intermittent
malfunction (Refer to GROUP 00, How to
Cope with Intermittent Malfunction ).
NO :
Replace the automatic A/C control panel (A/
C-ECU).
TROUBLESHOOTING
AUTOMATIC AIR CONDITIONER
55B-8
Code No. B1011,B1012: Ambient temperature sensor system
Ambient Temperature Sensor Circuit
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 : Grey R : Red P : Pink V : Violet PU : Purple
COMMENTS ON TROUBLE SYMPTOM
This code is set when the ambient temperature sen-
sor circuit is open (Code No.B1012) or is short (Code
No.B1011).
PROBABLE CAUSES
• Malfunction of the ambient temperature sensor
• Damaged the wiring harness and connectors
• Malfunction of the automatic A/C control panel (A/
C-ECU)
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