2005 MITSUBISHI LANCER ect

TROUBLESHOOTING
ENGINE COOLING14-5
TROUBLESHOOTING
INSPECTION CHART FOR TROUBLE
SYMPTOMS
M1141005600360
MB991223
A: MB991219
B: MB991220
C: MB991221
D: MB991222 Harness set
A: Test harness
B: LED harness
C: LED harness
adapter
D: ProbeMaking voltage and
resistance measurement
during troubleshooting
A: Connector pin contact
pressure inspection
B: Power circuit inspection
C: Power circuit inspection
D: Commercial tester
connection
MB991871 LLC changer Coolant refilling Tool Number Name Use
MB991223
A
B
C
D
AC
MB991871
Trouble symptom Inspection
procedure No.Reference page
Cooling fan (L.H.) and Cooling fan (R.H.) <4G1 (Vehicles with
A/C)> or A/C condenser fan <4G6> do not operate 1
P.14-6
Cooling fan (L.H.) and Cooling fan (R.H.) <4G1 (Vehicles with
A/C)> or A/C condenser fan <4G6> do not change speed or stop2
P.14-16
Cooling fan (L.H.) does not operate {When cooling fan (R.H.)
<4G1> or A/C condenser fan <4G6> operate} 3
P.14-20
Cooling fan (R.H.) <4G1> or A/C condenser fan <4G6> does not
operate {When cooling fan (L.H.) operate} 4
P.14-21

TROUBLESHOOTING
ENGINE COOLING14-6
INSPECTION PROCEDURE FOR
TROUBLE SYMPTOMS
INSPECTION PROCEDURE 1: Cooling Fan (L.H.) and Cooling Fan (R.H.) <4G1 (Vehicles with A/C)> or
A/C Condenser Fan <4G6> do not Operate
Wire colour code
B : Black LG : Light green
G : Green L : Blue
W : White Y : Yellow
SB : Sky blue BR : Brown
O : Orange GR : Gray
R : Red P : Pink V : Violet
FAN CONTROL
RELAY
A-09XENGINE CONTROL
RELAY
B-16X
AC303577
A-18-1
COOLING FAN
MOTOR (L.H.) COOLING FAN
MOTOR (R.H.)
<4G1 (VEHICLES
WITH A/C>
OR
A/C CONDENSER
FAN MOTOR <4G6>A-18-2 A-18
COOLING FAN
MOTOR DRIVE
CONTROL UNIT1 A-13
12 C-111 ENGINE-ECU OR
ENGINE-A/T-ECU
21 C-123
18 C-122
615
121179
810234
(MU802322) (MU801824)
C-123
(MU803784)C-122
(MU802611)A-13
C-111L
L
2
2211
1B L2
3 4 B-W FUSIBLE
LINK No.2
B3 1 R-Y R-Y
8 A-13
11 C-111
615
121179
810234
(MU802611)
J/C (6)
C-12
C-134 R-Y
3328
A-13
C-111
Cooling Fan (L.H.) and Cooling Fan (R.H.) or A/C Condenser Fan Drive Circut
AB

TROUBLESHOOTING
ENGINE COOLING14-7
CIRCUIT OPERATION
•The cooling fan motor drive control unit is
powered from fusible link (2).
•The engine-ECU or engine-A/T-ECU
uses input signals from the A/C switch, the
water temperature sensor unit and the vehicle
speed sensor or the output shaft speed
sensor to control the speed of 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>.
•The engine-ECU or engine-A/T-ECU
controls the cooling fan motor drive control
unit to activate 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>.
TECHNICAL DESCRIPTION
•The cause could be a malfunction of the cooling
fan motor drive control unit power supply or earth
circuit.
•If the communication line wiring harness between
the cooling fan motor drive control unit and the
engine-ECU or engine-A/T-ECU is
short-circuited to earth, the cooling fan motor
(L.H.) and the cooling fan motor (R.H.) <4G1
(Vehicles with A/C)> or the A/C condenser fan
motor <4G6> will not rotate.
•The cause could also be a malfunction of the
cooling fan motor (L.H.).
•The cause could also be a malfunction of imput
signal from the A/C switch, the water temperature
sensor unit and the vehicle speed sensor
or the output shaft speed sensor to the
engine-ECU or engine-A/T-ECU .
•The cause could also be a malfunction of the
cooling fan motor drive control unit or the
engine-ECU or engine-A/T-ECU .
TROUBLESHOOTING HINTS
•Malfunction of fusible link (2)
•Malfunction of fan control relay
•Malfunction of cooling fan motor (L.H.) without A/C>
•Malfunction of cooling fan motor drive control unit
•Malfunction of engine-ECU or
engine-A/T-ECU
•Damaged wiring harness or connector
DIAGNOSIS
STEP 1. Check the cooling fan motor (L.H.).

Refer to P.14-25.
Q: Is the cooling fan motor (L.H.) in good condition?
YES :
Go to Step 2 .
NO : Replace the cooling fan motor (L.H.) (Refer
to P.14-35). Then go to Step 24 .
STEP 2. Measure the power supply voltage at
cooling fan motor drive control unit connector
A-18.
(1) Disconnect cooling fan motor drive control unit
connector A-18 and measure wiring harness side
connector.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between cooling fan motor
drive control unit connector A-18 terminal 3 and
body earth.
•The voltage should measure system voltage.
(4) Turn the ignition switch to the "LOCK" (OFF)
position.
(5) Connect cooling fan motor drive control unit
connector A-18.
Q: Is the measured voltage system voltage?
YES :
Go to Step 17 .
NO : Go to Step 3 .
AC100293
A-18
321
Connector: A-18
AD
AC000246AF
A-18 Connector
(Component side)

TROUBLESHOOTING
ENGINE COOLING14-8
STEP 3. Check the cooling fan motor drive
control unit connector A-18.
Q: Is the connector in good condition?
YES : .
Go to Step 4 .
NO : . Repair or replace the connector. Then go to
Step 24 .
STEP 4. Check the fusible link No.2.
Q: Is the fusible link No.2 in good condition?
YES : .
Go to Step 5 .
NO : . Replace the fusible link No.2. Then go to
Step 24 .
STEP 5. Measure the power supply voltage at fan
control relay connector A-09X.(1) Disconnect fan control relay connector A-09X
(remove the fan control relay) and measure relay
box side connector.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between fan control relay
connector A-09X terminal 4 and body earth.
•The voltage should measure system voltage.
(4) Turn the ignition switch to the "LOCK" (OFF)
position.
(5) Connect fan control relay connector A-09X
(install the fan control relay).
Q: Is the measured voltage system voltage?
YES :
Go to Step 8 .
NO : Go to Step 6 .
STEP 6. Check the fan control relay connector
A-09X.
Q: Is the connector in good condition?
YES :
Go to Step 7 .
NO : Repair the connector or replace the relay
box. Then go to Step 24 .
AC100293
A-18
321
Connector: A-18
AD
AC303509AB
Fusible link
No.2
Relay box
AC303510AB
Fan control relay
Relay boxConnector: A-09X
A-09X
AC303511AB
A-09X Connector
(Relay box side)
AC303510AB
Fan control relay
Relay boxConnector: A-09X
A-09X

TROUBLESHOOTING
ENGINE COOLING14-9
STEP 7. Check the harness wire between fusible
link No.2 and fan control relay connector A-09X
terminal 4.
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 8. Check the fan control relay.
Refer to P.14-24.
Q: Is the fan control relay in good condition?
YES :
Go to Step 9 .
NO : Replace the fan control relay. Then go to
Step 24 .
STEP 9. Check the fan control relay connector
A-09X.
Q: Is the connector in good condition?
YES :
Go to Step 10 .
NO : Repair the connector or replace the relay
box. Then go to Step 24 .
STEP 10. Check the harness wire between fan
control relay connector A-09X terminal 2 and
cooling fan motor drive control unit connector
A-18 terminal 3.
Q: Is the harness wire in good condition?
YES :
Go to Step 11 .
NO : Repair the damaged harness wire. Then go
to Step 24 .
STEP 11. Measure the terminal voltage at fan
control relay connector A-09X.
(1) Disconnect fan control relay connector A-09X
(remove the fan control relay) and measure relay
box side connector.
(2) Turn the ignition switch to the "ON" position.
AC303509AB
Fusible link
No.2
Relay box
AC303510AB
Fan control relay
Relay boxConnector: A-09X
A-09X
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
AC303510AB
Fan control relay
Relay boxConnector: A-09X
A-09X

TROUBLESHOOTING
ENGINE COOLING14-10
(3) Measure the voltage between fan control relay
connector A-09X terminal 1 and body earth.
•The voltage should measure system voltage.
(4) Turn the ignition switch to the "LOCK" (OFF)
position.
(5) Connect fan control relay connector A-09X
(install the fan control relay).
Q: Is the measured voltage system voltage?
YES : .
Go to Step 14 .
NO : . Go to Step 12 .
STEP 12. Check the J/C No.6 C-12 vehicles> or C-134 ,
intermediate connector A-13 vehicles> C-111 and fan
control relay connector A-09X.
AC303517AB
A-09X Connector
(Relay box side)
AC303524
Connector: C-12
AB
C-12
C-12
AC303525
Connector: C-134
AB
C-134
C-134
AC303526
Connector: A-13
AB
A-13
A-13
AC303527
Connector: C-111
AB
C-111
C-111
615
121179
810234

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)