2005 MITSUBISHI LANCER Group 80

TROUBLESHOOTING
ENGINE COOLING14-11
Q: Are there connectors in good condition?
YES : .
Go to Step 13 .
NO : . Repair or replace the connector. Then go to
Step 24 .
STEP 13. Check the harness wire between J/C
No.6 C-12 terminal 33 or
C-134 terminal 33 and fan
control relay connector A-09X terminal 1.
Q: Are these harness wires in good condition?
YES :
An intermittent malfunction is suspected
(Refer to GROUP 00 - How to use
troubleshooting P.00-5).
NO : Repair the damaged harness wire. Then go
to Step 24 .
STEP 14. Check the continuity between fan
control relay connector A-09X and body earth.
(1) Disconnect fan control relay connector A-09X
(remove the fan control relay) and measure relay
box side connector.
(2) Measure the resistance between fan control relay
connector A-09X terminal 3 and body earth.
•Continuity exists.
(3) Connect fan control relay connector A-09X
(install the fan control relay).
Q: Does the continuity exists?
YES :
An intermittent malfunction is suspected
(Refer to GROUP 00 - How to use
troubleshooting P.00-5).
NO : Go to Step 15 .
AC303510AB
Fan control relay
Relay boxConnector: A-09X
A-09X
AC303524
Connector: C-12
AB
C-12
C-12
AC303525
Connector: C-134
AB
C-134
C-134
AC303510AB
Fan control relay
Relay boxConnector: A-09X
A-09X
AC303510AB
Fan control relay
Relay boxConnector: A-09X
A-09X
AC303533AB
A-09X Connector
(Relay box side)

TROUBLESHOOTING
ENGINE COOLING14-12
STEP 15. Check the fan control relay connector
A-09X.
Q: Is the connector in good condition?
YES :
Go to Step 16 .
NO : Repair the connector or replace the relay
box. Then go to Step 24 .
STEP 16. Check the harness wire between fan
control relay connector A-09X terminal 3 and
body earth.
Q: Is the harness wire in good condition?
YES :
An intermittent malfunction is suspected
(Refer to GROUP 00 - How to use
troubleshooting P.00-5).
NO : Repair the damaged harness wire. Then go
to Step 24 .
STEP 17. Check the continuity between cooling
fan motor drive control unit connector A-18 and
body earth.
(1) Disconnect cooling fan motor drive control unit
connector A-18 and measure wiring harness side
connector.
(2) Measure the resistance between cooling fan
motor drive control unit connector A-18 terminal 1
and body earth.
•Continuity exists.
(3) Connect cooling fan motor drive control unit
connector A-18.
Q: Dose the continuity exists?
YES :
Go to Step 20 .
NO : Go to Step 18 .
AC303510AB
Fan control relay
Relay boxConnector: A-09X
A-09X
AC303510AB
Fan control relay
Relay boxConnector: A-09X
A-09X
AC100293
A-18
321
Connector: A-18
AD
AC303534AB
A-18 Connector
(Wiring harness side)

TROUBLESHOOTING
ENGINE COOLING14-13
STEP 18. Check the cooling fan motor drive
control unit connector A-18.
Q: Is the connector in good condition?
YES :
Go to Step 19 .
NO : Repair or replace the connector. Then go to
Step 24 .
STEP 19. Check the harness wire between
cooling fan motor drive control unit connector
A-18 terminal 1 and body earth.
Q: Is the harness wire in good condition?
YES :
An intermittent malfunction is suspected
(Refer to GROUP 00 - How to use
troubleshooting P.00-5).
NO : Repair the damaged harness wire. Then go
to Step 24 .
STEP 20. Check the cooling fan motor drive
control unit connector A-18, intermediate
connector A-13 or C-111
and engine-ECU connector
C-123 or engine-A/T-ECU connector C-122
.
AC100293
A-18
321
Connector: A-18
AD
AC100293
A-18
321
Connector: A-18
AD
AC100293
A-18
321
Connector: A-18
AD
AC303526
Connector: A-13
AB
A-13
A-13
AC303527
Connector: C-111
AB
C-111
C-111
615
121179
810234

TROUBLESHOOTING
ENGINE COOLING14-15
STEP 22. Check the cooling fan motor drive
control unit.
(1) Disconnect engine-ECU connector C-123
or engine-A/T-ECU connector C-122 .
(2) Pull out connector terminal pin 21 or 18
to disconnect connector.
(3) Reconnect the connector with connector terminal
pin still removed.
(4) Turn the ignition switch to the "ON" position.(5) Check for the cooling fan operation.
•The cooling fan rotates. (with connector
terminal pin 21 or 18
disconnected)
•The cooling fan stops. (When connector
terminal pin 21 or 18 is
connected to the body earth.)
(6) Turn the ignition switch to the "OFF" position.
(7) Disconnect engine-ECU connector C-123
or engine-A/T-ECU connector C-122 , and
push in connector terminal pin 21 or 18
to disconnect connector.
(8) Reconnect the connector with connector terminal
pin still installed.
Q: Does the cooling fan rotate? And when the
connector terminal pin is connected to the body
earth, does the cooling fan stop?
YES :
Go to Step 23 .
NO : Replace the cooling fan motor drive control
unit (Refer to P.14-35). Then go to Step 24 .
STEP 23. MUT-II/III self-diag code
Check if an MPI system self-diag code is set. (Refer
to GROUP 13A - Trouble shooting P.13A-9) <4G1>
or (Refer to GROUP 13B - Trouble shooting
P.13B-9) <4G6>.
Q: Diagnosis code set?
YES :
Inspection chart for diagnosis code (Refer
to GROUP 13A - Trouble shooting
P.13A-15) <4G1> or Inspection chart for
diagnosis code (Refer to GROUP 13B -
Trouble shooting P.13B-15) <4G6>.
NO : Replace the engine-ECU or
engine-A/T-ECU (Refer to GROUP
13A P.13A-401). Then go to Step 24 .
STEP 24. Check the symptoms.
Q: Does the cooling fan motor (L.H.) and the cooling
fan motor (R.H.) <4G1 (Vehicles with A/C)> or A/C
condenser fan motor <4G6> operate correctly?
YES :
This symptoms is complete.
NO : Return to Step 1 .
AC303555AB
Connector: C-123 , C-122
C-123
or
C-122
C-123
Engine-ECU or
engine-A/T-ECU
C-122
AC303559
C-122 connector
(Harness side connector: ECU side view)
AB
C-123 connector
(Harness side connector: ECU side view)

TROUBLESHOOTING
ENGINE COOLING14-19
STEP 6. Check the cooling fan motor drive
control unit.
(1) Disconnect engine-ECU connector C-123
or engine-A/T-ECU connector C-122 .
(2) Pull out connector terminal pin 21 or 18
to disconnect connector.
(3) Reconnect the connector with connector terminal
pin still removed.
(4) Turn the ignition switch to the "ON" position.(5) Check for the cooling fan operation.
•The cooling fan rotates. (with connector
terminal pin 21 or 18
disconnected)
•The cooling fan stops. (When connector
terminal pin 21 or 18 is
connected to the body earth.)
(6) Turn the ignition switch to the "OFF" position.
(7) Disconnect engine-ECU connector C-123
or engine-A/T-ECU connector C-122 , and
push in connector terminal pin 21 or 18
to disconnect connector.
(8) Reconnect the connector with connector terminal
pin still installed.
Q: Does the cooling fan rotate? And when the
connector terminal pin is connected to the body
earth, does the cooling fan stop?
YES :
Go to Step 7 .
NO : Replace the cooling fan motor drive control
unit (Refer to P.14-35). Then go to Step 8 .
STEP 7. MUT-II/III self-diag code
Check if an MPI system self-diag code is set. (Refer
to GROUP 13A - Trouble shooting P.13A-9) <4G1>
or (Refer to GROUP 13B - Trouble shooting
P.13B-9) <4G6>.
Q: Diagnosis code set?
YES :
Inspection chart for diagnosis code (Refer
to GROUP 13A - Trouble shooting
P.13A-15) <4G1> or Inspection chart for
diagnosis code (Refer to GROUP 13B -
Trouble shooting P.13B-15) <4G6>.
NO : Replace the engine-ECU or
engine-A/T-ECU (Refer to GROUP
13A P.13A-401). Then go to Step 8 .
STEP 8. Check the symptoms.
Q: Does the cooling fan motor (L.H.) and the cooling
fan motor (R.H.) <4G1 (Vehicles with A/C)> or A/C
condenser fan motor <4G6> operate correctly?
YES :
This symptoms is complete.
NO : Return to Step 1 .
AC303555AB
Connector: C-123 , C-122
C-123
or
C-122
C-123
Engine-ECU or
engine-A/T-ECU
C-122
AC303559
C-122 connector
(Harness side connector: ECU side view)
AB
C-123 connector
(Harness side connector: ECU side view)

TROUBLESHOOTING
ENGINE COOLING14-21
INSPECTION PROCEDURE 4: Cooling Fan (R.H.) <4G1> or A/C Condenser Fan <4G6> does not
Operate {When Cooling Fan (L.H.) Operate}
COOLING FAN (L.H.) AND COOLING FAN
(R.H.) OR A/C CONDENSER FAN DRIVE
CIRCUIT
Refer to P.14-6.
CIRCUIT OPERATION
Refer to P.14-6.
TECHNICAL DESCRIPTION
The cause could be a malfunction of the cooling fan
motor (R.H.) <4G1> or A/C condenser fan motor
<4G6> or cooling fan motor drive control unit.
TROUBLESHOOTING HINTS
•Malfunction of cooling fan motor (R.H.) <4G1> or
A/C condenser fan motor <4G6>
•Malfunction of cooling fan motor drive control unit
DIAGNOSIS
STEP 1. Check the cooling fan motor (R.H.)
<4G1> or A/C condenser fan motor <4G6>.
Cooling fan motor (R.H.) check. (Refer to P.14-25)
<4G1>.
A/C condenser fan motor check. (Refer to GROUP
55 P.55-97) <4G6>.
Q: Is the cooling fan motor (R.H.) <4G1> or A/C
condenser fan motor <4G6> in good condition?
YES :
Go to Step 2 .
NO : Replace the cooling fan motor (R.H.) (Refer
to P.14-35) <4G1> or A/C condenser fan
motor (Refer to GROUP 55 P.55-96)
<4G6>. Then go to Step 3 .
STEP 2. Check the cooling fan motor drive
control unit.
Refer to P.14-23.
Q: Is the cooling fan motor drive control unit in good
condition?
YES :
Go to Step 3 .
NO : Replace the cooling fan motor drive control
unit (Refer to P.14-35). Then go to Step 3 .
STEP 3. Check the symptoms.
Q: Do the cooling fan (R.H.) <4G1> or A/C condenser
fan <4G6> operate (when the cooling fan (L.H.)
operate)?
YES :
This symptoms is complete.
NO : Return to Step 1 .

THERMOSTAT
ENGINE COOLING14-26
THERMOSTAT
REMOVAL AND INSTALLATIONM1141002400442
Pre-removal and Post-installation Operation
•Engine Coolant Draining and Refilling (Refer to P.14-22).
•Air Cleaner Assembly Removal and Installation (Refer to
GROUP 15 P.15-3).
•Battery Removal and Installation
AC203409AC
4
3 6 7
22 ± 4 N·m
<4G1>
AC301429
1
2
36 7
13 ± 2 N·m
AD
5
<4G6>

WAT ER P U M P
ENGINE COOLING14-29
WAT E R P U M P
REMOVAL AND INSTALLATION <4G1>M1141002700421
INSTALLATION SERVICE POINT
>>A<< WATER PUMP ASSEMBLY
INSTALLATION
1. Use a gasket scraper or wire brush to completely
eliminate all gasket material on the gasket
mounting surface.2. Apply a bead of the specified sealant.
Specified Sealant: MITSUBISHI GENUINE
PART No.MD970389 or equivalent
3. With the sealant still wet (within 15 minutes after
the sealant is applied), install the water pump
assembly. Do not apply the sealant in an area
more than the required.
Pre-removal and Post-installation Operation
•Engine Coolant Draining and Refilling (Refer to P.14-22).
•Valve Timing Belt Removal and Installation (Refer to
GROUP 11A P.11A-33).
AC303372
24 ± 3 N·m 23 ± 2 N·m
14 ± 1 N·m
1
2
Bolt specifications
Screw diameter × length mm 8 × 50
8 × 308 × 25
AB
2
2
Sealant: Mitsubishi Genuine Part
No. MD970389 or equivalent
Removal steps
1. Alternator adjusting brace
>>A<<2. Water pump assembly