Mitsubishi Lancer (4A9 engine). Manual — part 290
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55A-41
INSPECTION PROCEDURE 4: The Inside/Outside Air Changeover is impossible.
OUTSIDE/INSIDE AIR
SELECTION DAMPER
CONTROL MOTOR
HEATER CONTROL UNIT
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
AC801343
Heater Control Panel Circuit
HEATER
CONTROL
UNIT
HEATER
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
ACA00851
AC612706
Connectors: C-59, C-60, C-107, C-147 <LHD>
BR
C-60 (B)
C-107
C-110
C-59 (B)
C-147
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55A-42
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 heater control panel
• Damaged wiring harness or connectors
• Malfunction of the heater control unit
DIAGNOSIS PROCEDURE
STEP 1. Check the operation of the heater control
panel
Check that the 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 9: Refer to
heater control unit 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.
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-147 heater control
panel connector and C-60 heater control unit
connector
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Repair the connector.
STEP 5. Check the wiring harness between C-147
heater control panel connector terminal No. 9
and C-60 heater control unit connector terminal
No. 9.
• Check the heater 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-59 heater control
unit 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-59
heater control unit 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 heater control unit 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 heater control unit.
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55A-43
INSPECTION PROCEDURE 5: Outlet air temperature cannot be set
Air Mixing Damper Control Motor Circuit
HEATER CONTROL UNIT
AIR MIXING
DAMPER
CONTROL MOTOR
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
AC801344
AC612706
Connectors: C-59, C-117 <LHD>
BS
C-59 (B)
C-117
COMMENTS ON TROUBLE SYMPTOM
If the air conditioner outlet temperature cannot be
adjusted, the air mixing damper control motor or the
heater control unit may be faulty.
NOTE: It cannot be adjusted while the engine cool-
ant temperature is low.
PROBABLE CAUSES
• Malfunction of the air mix damper control motor
• Malfunction of the heater control unit
DIAGNOSTIC PROCEDURE
STEP 1. 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 2.
STEP 2. M.U.T.-III actuator test
Carry out the actuator test. (Refer to ).
• Item 06: air mixing damper control motor (Select
"position reset").
Q: Is the check result normal?
YES :
This diagnosis is complete.
NO :
Go to Step 3.
STEP 3. Connector check: C-117 air mixing
damper control motor connector, C-59 heater
control unit connector
Q: Is the check result normal?
YES :
Go to Step 4.
NO :
Repair the connector concerned.
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55A-44
STEP 4. Check the wiring harness wires between
C-117 air mixing damper control motor connector
(terminals 3, 2, 5, 4 and 1) and C-59 heater control
unit connector (terminals 29, 35, 36, 34 and 28).
• Check the input line for open circuit.
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Repair the wiring harness.
STEP 5. Replace the air mixing damper control
motor, and recheck the trouble symptom.
Check that outlet air temperature can be adjusted.
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 heater control unit.
INSPECTION PROCEDURE 6: Air outlets changeover is impossible.
Mode Selection Damper Control Motor Circuit
MODE SELECTION
DAMPER CONTROL
MOTOR
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
HEATER CONTROL UNIT
AC801345
AC612706
Connectors: C-59, C-108 <LHD>
BT
C-59 (B)
C-108
COMMENTS ON TROUBLE SYMPTOM
If the air conditioner outlets changeover is impossi-
ble, the mode selection damper control motor or the
heater control unit may be faulty.
PROBABLE CAUSES
• Malfunction of the mode selection damper control
motor
• Malfunction of the heater control unit
DIAGNOSTIC PROCEDURE
STEP 1. 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 2.
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