Mitsubishi L200. Manual — part 871
TROUBLESHOOTING
AUTOMATIC AIR CONDITIONER
55B-13
Code No.B1041,B1042: Potentiometer system for the air mixing damper
Air Mixing Damper Control Motor And Potentiometer Circuit
AIR MIXING DAMPER
CONTROL MOTOR AND
POTENTIOMETER
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 : Grey R : Red P : Pink V : Violet PU : Purple
DIAGNOSIS CODE SET CONDITION
This code is set when the air mixing damper control
motor potentiometer does not send any signal to the
A/C-ECU due to short or open circuit.
POSSIBLE CAUSES
• Malfunction of the air mixing damper control
motor and potentiometer
• Damaged the wiring harness or connectors
• Malfunction of the automatic A/C control panel (A/
C-ECU)
DIAGNOSIS PROCEDURE
STEP 1. Connector check: C-44 A/C-ECU
connector and C-49 air mixing damper control
motor and potentiometer connector
AC509611BV
Harness side
C-49 (B)
C-49
C-44
Harness side
C-44
Connectors: C-44, C-49 <LHD>
AC509932BZ
Harness side
C-49 (B)
C-49
C-44
Harness side
C-44
Connectors: C-44, C-49 <RHD>
Q: Is the check result normal?
TROUBLESHOOTING
AUTOMATIC AIR CONDITIONER
55B-15
STEP 2. Check the wiring harness between C-44
A/C-ECU connector (terminals 34, 32 and 38) and
C-49 air mixing damper control motor and
potentiometer connector (terminals 6, 2 and 5).
AC509612 AD
Harness side
C-49 (B)
C-49
C-44
Harness side
C-44
Connectors: C-44, C-49, C-137, C-138 <LHD>
C-137 (L)
C-138 (L)
C-137
C-138
AC509933AC
Harness side
C-49 (B)
C-49
C-44
Harness side
C-44
Connectors: C-44, C-49, C-137, C-138 <RHD>
C-137 (L)
C-138 (L)
C-137
C-138
NOTE: Prior to the wiring harness inspection, check
joint connector C-138 and C-137, and repair if neces-
sary.
• Check the potentiometer power supply, earth and
signal 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 air mixing damper control
motor and potentiometer.
Refer to
Q: Is the check result normal?
YES :
Go to Step 4.
NO :
Replace the air mixing damper control
motor and potentiometer.
STEP 4. Check whether the diagnosis code is
reset.
Q: Is the diagnosis code set?
YES :
Replace the A/C-ECU.
NO :
The trouble can be an intermittent
malfunction (Refer to GROUP 00, How to
Cope with Intermittent Malfunction ).
TROUBLESHOOTING
AUTOMATIC AIR CONDITIONER
55B-16
Code No.B1045: Motor drive system for the air mixing damper <LHD>
AIR MIXING DAMPER CONTROL
MOTOR AND POTENTIOMETER
Air Mixing Damper Control Motor And Potentiometer 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
MOTOR DRIVE
CIRCUIT
AC900842
A/C-ECU
DIAGNOSIS CODE SET CONDITION
This code is set when the air mixing damper cannot
be rotated to the preset opening angle.
POSSIBLE CAUSES
• Malfunction of the air mixing damper control
motor and potentiometer
• Malfunction of the automatic A/C control panel (A/
C-ECU)
• Damaged the wiring harness or connectors
DIAGNOSIS PROCEDURE
STEP 1. Connector check: C-43,C-44 A/C-ECU
connector and C-49 air mixing damper control
motor and potentiometer connector
AC805686
Connectors: C-43, C-44, C-49
Harness side
C-44
C-43
C-44
AP
Harness side
C-43
C-49 (B)
Harness side
C-49
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Repair the connector.
STEP 2. Check the wiring harness between A/C-
ECU connector C-43 terminal No.2, C-44 terminal
No.41 and C-49 air mixing damper control motor
and potentiometer connector (terminals 1 and 3).
AC805686
Connectors: C-43, C-44, C-49
Harness side
C-44
C-43
C-44
AP
Harness side
C-43
C-49 (B)
Harness side
C-49
• Check the motor activating lines 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 air mixing damper control
motor and potentiometer.
Refer to
Q: Is the check result normal?
YES :
Go to Step 4.
NO :
Replace the air mixing damper control
motor and potentiometer.
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