Mitsubishi Outlander GS45X. Manual - part 1576

ENGINE COOLING DIAGNOSIS

TSB Revision

ENGINE COOLING

14-7

Inspection Procedure 3: Radiator Fan and Condenser Fan do not Operate <2.4L ENGINE>.

ACA03142

FUSIBLE
LINK

29

FUSIBLE
LINK

28

RADIATOR 
FAN 
RELAY

FAN 
CONTROL
RELAY

CONDENSER
FAN 
RELAY

RADIATOR 
FAN 
MOTOR

CONDENSER 
FAN 
MOTOR

BLUE-WHITE

YELLOW-PINK

BLUE

BLUE

YELLOW-VIOLET

BLACK

BLACK

GRAY

ETACS-ECU

YELLOW-BLUE

BLUE

GRAY

BLUE

YELLOW

-BLUE

BLUE-WHITE

AB

Radiator Fan and Condenser Fan Drive Circuit

ENGINE COOLING DIAGNOSIS

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ENGINE COOLING

14-8

.

CIRCUIT OPERATION

• Based on the signal from the engine coolant tem-

perature sensor and the signal from the second-
ary pulley speed sensor signal (vehicle speed 
signal) from the transaxle control module (TCM), 
and the A/C switch signal from the A/C-ECU, the 
engine control 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, CVT system, 

A/C system, or MFI system may also be defec-
tive.

.

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 CVT 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 ECM.

AC608949

AC

A-29X

A-31X

A-26X

Fusible link (28), (29) and
connectors: A-26X, A-29X, A-31X

Fusible
link (28)

Fusible link (29)

Engine compartment relay box

AC506651

Connectors: A-05, A-43

A-05 (GR)

AL

A-43 (B)

ACA03143

Connector: C-312

ETACS-ECU

AB

ENGINE COOLING DIAGNOSIS

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ENGINE COOLING

14-9

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 13A, MFI Diagnosis 

− Diagnostic Function 

P.13A-11

).

• Item 14: Cooling fan

(Refer to GROUP 13A, MFI Diagnosis 

− Actuator Test Ref-

erence Table 

P.13A-850

)

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 
13A, MFI Diagnosis 

− Diagnostic Function 

P.13A-11

).

Q: Is any DTC set?

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

Diagnosis 

− Diagnostic Trouble Code Chart 

P.13A-49

). Then go to Step 23.

NO :  Go to Step 4.

ENGINE COOLING DIAGNOSIS

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ENGINE COOLING

14-10

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

− Diagnosis Function 

P.23A-14

).

Q: Is any DTC set?

YES : Repair the CVT system (Refer to GROUP 23A, 

Troubleshooting 

− Diagnostic Trouble Code Chart 

P.23A-29

). 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

).

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

). 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.

STEP 7. Measure the terminal voltage at ETACS-ECU 
connector C-312. 
(1) Disconnect the ETACS-ECU connector C-312 and measure 

at the harness connector side.

(2) Turn the ignition switch to the "ON" position.
(3) Measure the terminal voltage between ETACS-ECU 

connector C-312 terminal number 2 and body ground, and 
between ETACS-ECU connector C-312 terminal number 8 
and body ground.

OK: Battery positive voltage.

Q: Is the measured voltage battery positive voltage?

YES : Go to Step 13.
NO :  Go to Step 8.

ACA02108 AD

C-312 Harness connector:
Component side