Mitsubishi Outlander (2003+). Manual — part 123
SPECIAL TOOL
ENGINE COOLING
14-3
SPECIAL TOOL
M1141000600291
TROUBLESHOOTING
INSPECTION CHART FOR TROUBLE
SYMPTOMS
M1141005600412
Tool
Number
Name
Use
MB991871
LLC changer
Coolant refilling
MB991223
A: MB991219
B: MB991220
C: MB991221
D: MB991222
Harness set
A: Test harness
B: LED harness
C: LED harness
adapter
D: Probe
Making 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
MB991223
A
B
C
D
AC
Trouble symptom
Inspection
procedure No.
Reference page
Radiator fan and condenser fan do not operate
1
Radiator fan and condenser fan do not change speed or stop
2
Radiator fan does not operate
3
Condenser fan does not operate
4
TROUBLESHOOTING
ENGINE COOLING
14-4
INSPECTION PROCEDURE FOR
TROUBLE SYMPTOMS
INSPECTION PROCEDURE 1: Radiator Fan and Condenser Fan do not Operate
CIRCUIT OPERATION
•
The fan controller is powered from fusible link
No.2.
•
The engine-ECU <M/T> or engine-A/T-ECU
<A/T> uses input signals from the A/C switch, the
water temperature sensor unit and the vehicle
speed sensor <M/T> or the output shaft speed
sensor <A/T> to control the speed of the radiator
fan motor and the condenser fan motor.
•
The engine-ECU <M/T> or engine-A/T-ECU
<A/T> controls the fan controller to activate the
radiator fan motor and the condenser fan motor.
TECHNICAL DESCRIPTION
•
The cause could be a malfunction of the fan
controller power supply or earth 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 : Gray
R : Red P : Pink V : Violet
FUSIBLE
LINK No.2
FAN CONTROL
RELAY
RADIATOR
FAN MOTOR
CONDENSER
FAN MOTOR
FAN
CONTROLLER
ENGINE CONTROL
RELAY
AC309494
ENGINE-ECU <M/T>OR
ENGINE-A/T-ECU <A/T>
NOTE
4G63
4G69
Radiator Fan and Condenser Fan Drive Circut
AB
TROUBLESHOOTING
ENGINE COOLING
14-5
•
If the communication line wiring harness between
the fan controller and the engine-ECU <M/T> or
engine-A/T-ECU <A/T> is short-circuited to earth,
the radiator fan motor and the condenser fan
motor will not rotate.
•
The cause could also be a malfunction of input
signal from the A/C switch, the water temperature
sensor unit and the vehicle speed sensor <M/T>
or the output shaft speed sensor <A/T> to the
engine-ECU <M/T> or engine-A/T-ECU <A/T>.
•
The cause could also be a malfunction of the fan
controller or the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
TROUBLESHOOTING HINTS
•
Malfunction of fusible link No.2
•
Malfunction of fan control relay
•
Malfunction of cooling fan motor
•
Malfunction of fan controller
•
Malfunction of engine-ECU <M/T> or
engine-A/T-ECU <A/T>
•
Damaged wiring harness or connector
DIAGNOSIS
STEP 1. Check the radiator fan motor.
Refer to
Q: Is the radiator fan motor in good condition?
YES :
Go to Step 2.
NO :
Replace the radiator fan motor (Refer to
). Then go to Step 24.
STEP 2. Measure the power supply voltage at fan
controller connector A-20.
(1) Disconnect fan controller connector A-20 and
measure wiring harness side connector.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between fan controller
connector A-20 terminal 3 and body earth.
•
The voltage should measure system voltage.
(4) Turn the ignition switch to the "LOCK" (OFF)
position.
(5) Connect fan controller connector A-20.
Q: Is the measured voltage system voltage?
YES :
Go to Step 17.
NO :
Go to Step 3.
STEP 3. Check the fan controller connector A-20.
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?
AC301902
3
2
1
A-20
Connector: A-20
AB
3
2
1
AC201418
Connector A-20
(Conponent side)
AF
AC301902
3
2
1
A-20
Connector: A-20
AB
AC309505 AB
Fusible link
No.2
Relay box
TROUBLESHOOTING
ENGINE COOLING
14-6
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-10X.
(1) Disconnect fan control relay connector A-10X
(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-10X 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-10X
(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-10X.
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.
STEP 7. Check the harness wire between fusible
link No.2 and fan control relay connector A-10X
terminal 4.
Q: Is the harness wire in good condition?
YES :
An intermittent malfunction is suspected
(Refer to GROUP 00 - How to use
troubleshooting
).
NO :
Repair the damaged harness wire. Then go
to Step 24.
AC309505 AC
Fan control relay
Relay box
Connector: A-10X
A-10X
AC303511AD
A-10X Connector
(Relay box side)
AC309505 AC
Fan control relay
Relay box
Connector: A-10X
A-10X
AC309505 AB
Fusible link
No.2
Relay box
AC309505 AC
Fan control relay
Relay box
Connector: A-10X
A-10X
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