Mitsubishi Lancer Evolution IX. Manual — part 537
![](/vehicles/winoney/wruvea/ger/hahoou.png)
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-21
COMMENTS ON TROUBLE SYMPTOM
This code is set when the mode selection damper
control motor potentiometer does not send any sig-
nal to the A/C-ECU due to short or open circuit.
PROBABLE CAUSES
• Malfunction of the mode selection 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. Check the mode selection damper
control motor and potentiometer.
Refer to
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Replace the mode selection damper control
motor and potentiometer.
STEP 2. Connector check: C-36 A/C-ECU
connector and C-143 mode selection damper
control motor and potentiometer connector
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Repair the connector.
AC504622AB
Connector: C-36 <LHD>
Harness side
C-36 (B)
AC504624AK
Connectors: C-36, C-143 <RHD>
Harness side
C-36
C-143
C-143
C-36 (B)
AC504617AM
Connector: C-143 <LHD>
Harness side
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TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-22
STEP 3. Check the wiring harness between C-36
A/C-ECU connector (terminals 10, 6 and 20) and
C-143 mode selection damper control motor and
potentiometer connector (terminals 2, 5 and 6).
NOTE: Prior to the wiring harness inspection, check
intermediate connector C-10 and heater water tem-
perature sensor connector C-32 <RH drive vehi-
cles>, and repair if necessary.
• Check the potentiometer power supply, earth and
signal line for open or short circuit.
Q: Is the check result normal?
YES :
Malfunction of the automatic A/C control
panel (A/C-ECU)
NO :
Repair the wiring harness.
AC504622AB
Connector: C-36 <LHD>
Harness side
C-36 (B)
AC504624AR
Connectors: C-10, C-32, C-36, C-143 <RHD>
Harness side
C-10
C-36
C-143
C-10
C-36 (B)
C-143
Harness side
C-32
Harness side
C-32
AC504701AD
Connectors: C-10, C-143 <LHD>
Harness side
C-10
C-143
C-10
C-143
![](/vehicles/winoney/wruvea/ger/heroounkend.png)
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-23
Code No.41: Air Mixing Damper Control Motor System
COMMENTS ON TROUBLE SYMPTOM
This code is set when the air mixing damper cannot
be rotated to the preset opening angle.
PROBABLE 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. Check the air mixing damper control
motor and potentiometer.
Refer to
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Replace the air mixing damper control
motor and potentiometer.
Air Mixing Damper Control Motor 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
A/C-ECU
AIR MIXING DAMPER CONTROL
MOTOR AND POTENTIOMETER
![](/vehicles/winoney/wruvea/ger/zce.png)
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-24
STEP 2. Connector check: C-37 A/C-ECU
connector and C-144 air mixing damper control
motor and potentiometer connector
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Repair the connector.
AC504622AC
Connector: C-37 <LHD>
Harness side
C-37 (B)
AC504624AM
Connectors: C-37, C-144 <RHD>
Harness side
C-37
C-144
C-144
C-37 (B)
AC504617AL
Connector: C-144 <LHD>
Harness side
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