Mitsubishi Outlander GS45X. Manual - part 1578

ENGINE COOLING DIAGNOSIS

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ENGINE COOLING

14-15

Inspection Procedure 4: Radiator Fan and Condenser Fan do not Operate <3.0L ENGINE>.

ACA03153

FUSIBLE
LINK

29

FUSIBLE
LINK

28

RADIATOR 
FAN 
RELAY

FAN 
CONTROL
RELAY

CONDENSER
FAN 
RELAY

RADIATOR 
FAN 
MOTOR

CONDENSER 
FAN 
MOTOR

RED

YELLOW-PINK

BLUE

BLUE

BLACK

BLACK

RED-BLACK

ETACS-ECU

YELLOW-BLUE

BLUE

BLUE

YELLOW

-BLUE

RED

YELLOW-BLUE

RED-

BLACK

BLUE-WHITE

BLUE-WHITE

BLUE-

WHITE

BLUE-WHITE

AB

Radiator Fan and Condenser Fan Drive Circuit

ENGINE COOLING DIAGNOSIS

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ENGINE COOLING

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.

CIRCUIT OPERATION

• Based on the signal from the engine coolant tem-

perature sensor and the output shaft speed sen-
sor signal (vehicle speed signal) from the 
transaxle control module (TCM), and the A/C 
switch signal from the A/C-ECU, the engine con-
trol module (ECM) sends the radiator fan and 
condenser fan control signal to the ETACS-ECU 
via CAN bus line.

• Based on the radiator fan and condenser fan con-

trol signal from the ECM, the ETACS-ECU turns 
ON/OFF the radiator fan relay, condenser fan 
relay, and the fan control relay to control the rota-
tion of the radiator fan motor and condenser fan 
motor.

.

TECHNICAL DESCRIPTION

• If the radiator fan and condenser fan do not oper-

ate, the radiator fan motor, the condenser fan 
motor, the radiator fan relay, the condenser fan 
relay, the fan control relay, the ETACS-ECU may 
be defective.

• The CAN bus line, ETACS-ECU, A/T system, A/C 

system, or MFI system may also be defective.

.

TROUBLESHOOTING HINTS (THE MOST 
LIKELY CAUSES FOR THIS CASE:)

• Malfunction of CAN bus system.

• Damaged harness or connector.

• Malfunction of the MFI system.

• Malfunction of the A/T system.

• Malfunction of the A/C system.

• Malfunction of fusible link No. 28.

• Malfunction of fusible link No. 29.

• Malfunction of radiator fan relay.

• Malfunction of condenser fan relay.

• Malfunction of fan control relay.

• Malfunction of radiator fan motor.

• Malfunction of condenser fan motor.

• Malfunction of engine compartment relay box.

• Malfunction of ETACS-ECU.

• Malfunction of engine control module.

AC703100

A-34X

A-35X

A-36X

Fusible link (28), (29) and 
connectors: A-34X, A-35X, A-36X

Fusible
link (28)

Fusible
link (29)

AB

AC703101

A-43

Connectors: A-05, A-43

A-05

AB

ACA03143

Connector: C-312

ETACS-ECU

AB

ENGINE COOLING DIAGNOSIS

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ENGINE COOLING

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DIAGNOSTIC PROCEDURE

Required Special Tools:

• MB991958: Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: M.U.T.-III USB Cable

• MB991910: M.U.T.-III Main Harness A

• MB991223: Harness Set

• MB992006: Extra Fine Probe

CAUTION

If there is any problem in the CAN bus lines, an incorrect 
DTC may be set. Prior to this diagnosis, diagnose the CAN 
bus lines (Refer to GROUP 54C, Trouble code diagnosis 

P.54C-10

.)

STEP 1. Using scan tool MB991958, check the CAN bus 
line diagnostics.
Use scan tool to diagnose the CAN bus line (Refer to GROUP 
54C, Explanation About The Scan Tool Can Bus Diagnostics 

P.54C-10

).

Q: Is the check result satisfactory?

YES : Go to Step 2.
NO :  Repair the CAN bus lines (Refer to GROUP 54C, 

Troubleshooting 

− CAN Bus Diagnostic Table 

P.54C-17

). Then go to Step 23.

STEP 2. Using scan tool MB991958, check the MFI system 
actuator test.
Using scan tool to check the MFI system actuator test (Refer to 
GROUP 13B, MFI Diagnosis 

− Diagnostic Function 

P.13B-11

).

• Item 14: Cooling fan

(Refer to GROUP 13B, MFI Diagnosis 

− Actuator Test Ref-

erence Table 

P.13B-858

)

Q: Is the check result normal?

YES : Go to Step 22.
NO :  Go to Step 3.

STEP 3. Using scan tool MB991958, read the MFI system 
DTC.
Using scan tool to read the MFI system DTC (Refer to GROUP 
13B, MFI Diagnosis 

− Diagnostic Function 

P.13B-11

).

Q: Is any DTC set?

YES : Repair the MFI system (Refer to GROUP 13B, MFI 

Diagnosis 

− Diagnostic Trouble Code Chart 

P.13B-50

). Then go to Step 23.

NO :  Go to Step 4.

ENGINE COOLING DIAGNOSIS

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ENGINE COOLING

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STEP 4. Using scan tool MB991958, read the A/T system 
DTC.
Using scan tool to read the A/T system DTC (Refer to GROUP 
23C, Troubleshooting 

− Diagnosis Function 

P.23C-18

).

Q: Is any DTC set?

YES : Repair the A/T system (Refer to GROUP 23C, 

Troubleshooting 

− Diagnostic Trouble Code Chart 

P.23C-164

). Then go to Step 23.

NO :  Go to Step 5.

STEP 5. Using scan tool MB991958, read the A/C system 
DTC.
Using scan tool to read the A/C system DTC (Refer to GROUP 
55A, Manual A/C Diagnosis 

− Diagnosis Function 

P.55A-7

) 

<vehicles with manual A/C> or  (Refer to GROUP 55B, Auto-
matic A/C Diagnosis 

− Diagnosis Function 

P.55B-4

) <vehicles 

with automatic A/C>.
Q: Is any DTC set?

YES : Repair the A/C system (Refer to GROUP 55A, 

Manual A/C Diagnosis 

− Diagnostic Trouble Code 

Chart 

P.55A-11

) <vehicles with manual A/C> or  

(Refer to GROUP 55B, Automatic A/C Diagnosis 

− 

Diagnostic Trouble Code Chart 

P.55B-8

) <vehicles 

with automatic A/C>. Then go to Step 23.

NO :  Go to Step 6.

STEP 6. Using scan tool MB991958, read the ETACS 
system DTC.
Using scan tool to read the ETACS system DTC (Refer to 
GROUP 54A, ETACS, Troubleshooting 

− Diagnosis Function 

P.54A-729

).

Q: Is any DTC set?

YES : Repair the ETACS system (Refer to GROUP 54A, 

ETACS, Troubleshooting 

− Diagnostic Trouble Code 

Chart 

P.54A-732

). Then go to Step 23.

NO :  Go to Step 7.