Mitsubishi Lancer Evolution IX. Manual — part 533
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-5
TROUBLESHOOTING
DIAGNOSIS TROUBLESHOOTING FLOW
M1554004700102
Refer to GROUP 00, How to Use Troubleshoot-
ing/Inspection Service Points
.
DIAGNOSIS FUNCTION
M1554004800176
How to read diagnosis code
Connect the M.U.T.-II/III to the 16-pin diagnosis con-
nector to read diagnosis code (Refer to GROUP 00,
How to Use Troubleshooting/Inspection Service
Points
How to erase diagnosis code
Refer to GROUP 00, How to Use Troubleshoot-
ing/Inspection Service Points
.
DIAGNOSIS CODE CHART
M1554004900537
MB992006
Extra fine probe
Continuity check and voltage
measurement at harness wire
or connector
Tool
Number
Name
Use
MB992006
Code No.
Diagnostic item
Reference page
11
Interior temperature senor system (open circuit)
12
Interior temperature sensor system (short circuit)
13
Outside thermo sensor system (open circuit)
14
Outside thermo sensor system (short circuit)
15
Heater water temperature sensor system (open circuit)
16
Heater water temperature sensor system (short circuit)
21
Air thermo sensor system (open circuit)
22
Air thermo sensor system (short circuit)
31
Air mixing damper control motor and potentiometer sensor system
32
Mode selection damper control motor and potentiometer sensor
system
41
Air mixing damper control motor and potentiometer activating
system
42
Mode selection damper control motor and potentiometer activating
system
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-6
DIAGNOSTIC TROUBLE CODE
PROCEDURES
Code No.11, 12: Interior Temperature Sensor System
COMMENTS ON TROUBLE SYMPTOM
This code is set when the interior temperature sensor
circuit is open (Code No.11) or is short (Code No.12).
PROBABLE CAUSES
• Malfunction of the interior temperature sensor
• Damaged the wiring harness or connectors
• Malfunction of the automatic A/C control panel
(A/C-ECU)
DIAGNOSIS PROCEDURE
STEP 1. Check the interior temperature sensor.
Refer to
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Replace the interior temperature sensor.
Interior Temperature Sensor 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
A/C-ECU
INTERIOR
TEMPERATURE
SENSOR
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-7
STEP 2. Connector check: C-36 A/C-ECU
connector and C-142 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-36
A/C-ECU connector (terminals 1 and 20) and
C-142 interior temperature sensor connector
(terminals 2 and 1).
• Check the sensor signal line and earth line for
open or short circuit.
Q: Is the check result normal?
YES :
Replace the automatic A/C control panel
(A/C-ECU)
NO :
Repair the wiring harness.
AC504641AC
Connector: C-36, C-142 <LHD>
Harness side
C-142 (B)
C-36 (B)
C-36
C-142
AC504618AJ
Connector: C-36 <RHD>
Harness side
C-36 (B)
AC504625AD
Connector: C-142 <RHD>
Harness side
C-142 (B)
AC504641AC
Connector: C-36, C-142 <LHD>
Harness side
C-142 (B)
C-36 (B)
C-36
C-142
AC504618AJ
Connector: C-36 <RHD>
Harness side
C-36 (B)
AC504625AD
Connector: C-142 <RHD>
Harness side
C-142 (B)
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-8
Code No.13, 14: Outside Thermo Sensor System
COMMENTS ON TROUBLE SYMPTOM
This code is set when the outside thermo sensor cir-
cuit is open (Code No.13) or is short (Code No.14).
PROBABLE CAUSES
• Malfunction of the outside thermo sensor
• Damaged the wiring harness and connectors
• Malfunction of the automatic A/C control panel
(A/C-ECU)
DIAGNOSIS PROCEDURE
STEP 1. Check the outside thermo sensor.
Refer to
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Replace the outside thermo sensor.
Outside Thermo Sensor 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
A/C-ECU
OUTSIDE
THERMO
SENSOR
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