Mitsubishi Lancer Evolution IX. Manual - part 542
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-41
NOTE:
Prior to the wiring harness inspection, check interme-
diate connector C-124 <LH drive vehicles> or C-122
<RH drive vehicles>, and repair if necessary.
• Check the communication line for open or short
circuit.
Q: Is the check result normal?
YES :
Go to Step 17.
NO :
Repair the wiring harness.
STEP 17. Check the magnetic clutch operation.
Refer to
Q: Can the sound of the magnetic clutch (click) be
heard?
YES :
Go to Step 18.
NO :
Replace the compressor magnet clutch.
STEP 18. Check the refrigerant temperature
switch.
Refer to
Q: Is the refrigerant temperature switch operating
properly?
YES :
Go to Step 19.
NO :
Replace the refrigerant temperature switch.
STEP 19. Check the air thermo sensor.
Refer to
Q: Is the air thermo sensor in good condition?
YES :
Go to Step 20.
NO :
Replace the air thermo sensor.
STEP 20. Check the refrigerant level.
Refer to
Q: Is the refrigerant level correct?
YES :
Go to Step 21.
NO :
Correct the refrigerant level (Refer to
).
STEP 21. Replace the A/C-ECU.
Check that the air conditioner works normally.
Q: Is the check result normal?
YES :
The procedure is complete.
NO :
Replace the engine-ECU.
Inspection Procedure 3: A/C Outlet Air Temperature cannot be set.
COMMENTS ON TROUBLE SYMPTOM
When the blower air temperature can not be
changed even if the preset temperature is changed,
the sensors, the air mixing damper control motor and
potentiometer or the A/C-ECU may be defective.
PROBABLE CAUSE
• Malfunction of the A/C-ECU
DIAGNOSIS PROCEDURE
M.U.T.-II/III diagnosis code
Q: Is the diagnosis code set?
YES :
Refer to diagnosis code chart
NO :
Replace the automatic A/C control panel
(A/C-ECU).
AC504618AH
Connector: C-122 <RHD>
C-122 (L)
AC504622AD
Connector: C-124 <LHD>