Mitsubishi Lancer (4A9 engine). Manual — part 294
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55A-57
STEP 9. Replace the power transistor and
recheck the trouble symptom
Check that the blower motor operates normally.
Q: Is the check result normal?
YES :
This diagnosis is complete.
NO :
Replace the A/C-ECU.
INSPECTION PROCEDURE 5: The Inside/Outside Air Changeover is impossible.
OUTSIDE/INSIDE AIR
SELECTION DAMPER
CONTROL MOTOR
A/C-ECU
Outside/Inside Air Selection 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 SI : Silver
A/C Control Panel Circuit
A/C-ECU
A/C
CONTROL
PANEL
CPU
INTERFACE
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 SI : Silver
ACA00799
AC612706
Connectors: C-13, C-15, C-107, C-119 <LHD>
AG
C-13 (B)
C-15 (B)
C-107
C-119
AC612710
Connectors: C-13, C-15, C-107 <RHD>
AU
C-15 (B)
C-13 (B)
C-107
AC612711
Connector: C-119 <RHD>
AG
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55A-58
COMMENTS ON TROUBLE SYMPTOM
If the air recirculation cannot be changed by using
the inside air/outside air changeover switch, the
inside air/outside air changeover motor system may
be faulty.
PROBABLE CAUSES
• Malfunction of the outside/inside air selection
damper control motor
• Malfunction of the A/C control panel
• Damaged wiring harness or connectors
• Malfunction of the A/C-ECU
DIAGNOSIS PROCEDURE
STEP 1. Check the operation of the heater control
panel
Check that the A/C switch, rear window defogger
switch and air volume control dial can operate.
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
INSPECTION PROCEDURE 15: Refer to A/
C-ECU power supply system .
STEP 2. M.U.T.-III diagnosis code
Check that the diagnosis code related to the air con-
ditioner is not set.
Q: Is the diagnosis code set?
YES :
Carry out the diagnosis code procedures.
Refer to .
NO :
Go to Step 3.
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55A-59
STEP 3. M.U.T.-III actuator test
Carry out the actuator test. (Refer to ).
• Item 05: In/out selection damper (Select "position
reset".)
Q: Does the blower motor work normally?
YES :
This diagnosis is complete.
NO :
Go to Step 4.
STEP 4. Connector check: C-119 A/C control
panel connector and C-15 A/C-ECU connector
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Repair the connector.
STEP 5. Check the wiring harness between C-119
A/C control panel connector terminal No. 9 and
C-15 A/C-ECU connector terminal No. 9.
• Check the A/C control panel signal line for open
or short circuit.
Q: Is the check result normal?
YES :
Go to Step 6.
NO :
Repair the wiring harness.
STEP 6. Connector check: C-13 A/C-ECU
connector and C-107 outside/inside air selection
damper control motor connector
Q: Is the check result normal?
YES :
Go to Step 7.
NO :
Repair the connector.
STEP 7. Check the wiring harness between C-13
A/C-ECU connector (terminals 29, 24, 27, 25 and
26) and C-107 outside/inside air selection damper
control motor connector (terminals 3, 1, 4, 5 and
2).
• Check the A/C control panel signal line and earth
line for open or short circuit.
Q: Is the check result normal?
YES :
Go to Step 8.
NO :
Repair the wiring harness.
STEP 8. Replace the air outside/inside air
circulation switching damper motor, and then
recheck the trouble symptom.
Check to see that the outside air/inside air circula-
tion switching damper motor operates normally.
NOTE: Whenever the motor is replaced, initialise the
motor position by using the Actuator Test.
Q: Is the check result normal?
YES :
This diagnosis is complete.
NO :
Replace the A/C-ECU.
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55A-60
INSPECTION PROCEDURE 6: The A/C compressor does not work <Petrol engine>
A/C Compressor Assembly Circuit <Petrol engine>
A/C
COMPRESSOR
RELAY
A/C
COMPRESSOR
ASSEMBLY
A/C
REFRIGERANT
TEMPERATURE
SWITCH
A/C
COMPRESSOR
CLUTCH
ENGINE-ECU
RELAY
BOX
FUSIBLE
LINK
36
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 SI : Silver
ACB02673
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