Mitsubishi Grandis. Manual - part 809

TROUBLESHOOTING

ENGINE COOLING

14-9

STEP 13. Check the continuity between fan 
control relay connector A-13X and body earth.

(1) Disconnect fan control relay connector A-13X 

(remove the fan control relay) and measure relay 
box side connector.

(2) Measure the resistance between fan control relay 

connector A-13X terminal 1 and body earth.

• Continuity exists.

(3) Connect fan control relay connector A-13X 

(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 14.

STEP 14. Check the fan control relay connector 
A-13X.

Q: Is the connector in good condition?

YES : 

Go to Step 15.

NO : 

Repair the connector or replace the relay 
box. Then go to Step 24.

STEP 15. Check the earth connector A-25.

Q: Is the connector in good condition?

YES : 

Go to Step 16.

NO : 

Repair or replace the connector. Then go to 
Step 24.

STEP 16. Check the harness wire between fan 
control relay connector A-13X terminal 1 and 
body earth connector A-25 terminal 5.

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.

AC311245AC

Fan control relay

Relay box

Connector: A-13X

A-13X

AC311247 AB

A-13X Connector
(Relay box side)

AC311245AC

Fan control relay

Relay box

Connector: A-13X

A-13X

AC311242 AB

A-25 

Oil reservoir

Connector: A-25

AC311245AC

Fan control relay

Relay box

Connector: A-13X

A-13X

AC311242 AB

A-25 

Oil reservoir

Connector: A-25

TROUBLESHOOTING

ENGINE COOLING

14-10

STEP 17. Check the continuity between fan 
controller connector A-26 and body earth.

(1) Disconnect fan controller connector A-26 and 

measure wiring harness side connector.

(2) Measure the resistance between fan controller 

connector A-26 terminal 1 and body earth.

• Continuity exists.

(3) Connect fan controller connector A-26.

Q: Dose the continuity exists?

YES : 

Go to Step 20.

NO : 

Go to Step 18.

STEP 18. Check the fan controller connector 
A-26.

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 fan 
controller connector A-26 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.

AC302093

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2

3

AG

A-26

Connector: A-26

AC303534AD

A-26 Connector
(Wiring harness side)

AC302093

1

2

3

AG

A-26

Connector: A-26

AC302093

1

2

3

AG

A-26

Connector: A-26

TROUBLESHOOTING

ENGINE COOLING

14-11

STEP 20. Check the fan controller connector 
A-26, intermediate connector A-16 and 
engine-ECU connector or engine-A/T-ECU 
connector C-110.

Q: Are these connectors in good condition?

YES : 

Go to Step 21.

NO : 

Repair or replace the connector. Then go to 
Step 24.

STEP 21. Check the harness wire between fan 
controller connector A-26 terminal 2 and 
engine-ECU or engine-A/T-ECU connector C-110 
terminal 17.

Q: Are these harness wires in good condition?

YES : 

Go to Step 22.

NO : 

Repair the damaged harness wire. Then go 
to Step 24.

AC302093

1

2

3

AG

A-26

Connector: A-26

AC311248AB

Connector: A-16

A-16

A-16

AC311284AB

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5

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17

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24

25

26

27

C-110 (GR) Harness side

Connector: C-110

<L.H. drive vehicles>

<R.H. drive vehicles>

C-110 (GR)

C-110 (GR)

AC302093

1

2

3

AG

A-26

Connector: A-26

AC311284AB

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5

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25

26

27

C-110 (GR) Harness side

Connector: C-110

<L.H. drive vehicles>

<R.H. drive vehicles>

C-110 (GR)

C-110 (GR)

TROUBLESHOOTING

ENGINE COOLING

14-12

STEP 22. Check the fan controller.

(1) Disconnect engine-ECU connector or 

engine-A/T-ECU connector C-110.

(2) Pull out connector terminal pin 17 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 17 disconnected)

• The cooling fan stops. (When connector 

terminal pin 17 is connected to the body 
earth.)

(6) Turn the ignition switch to the "OFF" position.
(7) Disconnect engine-ECU connector or 

engine-A/T-ECU connector C-110, and push in 
connector terminal pin 17 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 fan motor and fan controller 
(Refer to 

P.14-25

). Then go to Step 24.

STEP 23. MUT-III self-diag code

Check if an MPI system self-diag code is set. (Refer 
to GROUP 13A - Trouble shooting 

P.13A-11

).

Q: Diagnosis code set?

YES : 

Inspection chart for diagnosis code (Refer 

to GROUP 13A - Trouble shooting 

P.13A-20

).

NO : 

Replace the engine-ECU <M/T> or 
engine-A/T-ECU <A/T> (Refer to GROUP 
13A, Engine-ECU 

P.13A-399

). Then go to 

Step 24.

STEP 24. Check the symptoms.

Q: Does the radiator fan motor and the condenser fan 

motor operate correctly?

YES : 

This symptoms is complete.

NO : 

Return to Step 1.

INSPECTION PROCEDURE 2: Radiator Fan and Condenser Fan do not Change Speed or Stop

Radiator Fan and Condenser Fan Drive 
Circuit

Refer to 

P.14-4

.

TECHNICAL DESCRIPTION

• The cause could be a malfunction of the fan 

controller power supply or earth circuit.

• 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>.

AC311284AB

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25

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C-110 (GR) Harness side

Connector: C-110

<L.H. drive vehicles>

<R.H. drive vehicles>

C-110 (GR)

C-110 (GR)

AC311277

C-110 connector
(Harness side connector: ECU side view)

AB