Mitsubishi Grandis. Manual - part 810

TROUBLESHOOTING

ENGINE COOLING

14-13

• 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 fan control relay.

Refer to 

P.14-19

.

Q: Is the fan control relay in good condition?

YES : 

Go to Step 2.

NO : 

Replace the fan control relay. Then go to 
Step 8.

STEP 2. Check the fan control relay connector 
A-13X.

Q: Is the connector in good condition?

YES : 

Go to Step 3.

NO : 

Repair the connector or replace the relay 
box. Then go to Step 8.

STEP 3. Check the harness wire between fan 
control relay connector A-13X terminal 2 and fan 
controller connector A-26 terminal 3.

Q: Is the harness wire in good condition?

YES : 

Go to Step 4.

NO : 

Repair the damaged harness wire. Then go 
to Step 8.

AC311245AC

Fan control relay

Relay box

Connector: A-13X

A-13X

AC311245AC

Fan control relay

Relay box

Connector: A-13X

A-13X

AC302093

1

2

3

AG

A-26

Connector: A-26

TROUBLESHOOTING

ENGINE COOLING

14-14

STEP 4. 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 5.

NO : 

Repair or replace the connector. Then go to 
Step 8.

STEP 5. Check the harness wire between fan 
controller connector A-26 terminal 2 and 
engine-ECU connector or engine-A/T-ECU 
connector C-110 terminal 17.

Q: Are these harness wires in good condition?

YES : 

Go to Step 6.

NO : 

Repair the damaged harness wire. Then go 
to Step 8.

AC302093

1

2

3

AG

A-26

Connector: A-26

AC311248AB

Connector: A-16

A-16

A-16

AC311284AB

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

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

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

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)

TROUBLESHOOTING

ENGINE COOLING

14-15

STEP 6. 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 7.

NO : 

Replace the fan motor and fan controller 
(Refer to 

P.14-25

). Then go to Step 8.

STEP 7. 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 

P.13A-399

). Then go to Step 8.

STEP 8. 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 3: Radiator Fan does not Operate

Radiator Fan and Condenser Fan Drive 
Circuit

Refer to 

P.14-4

.

TECHNICAL DESCRIPTION

The cause could be a malfunction of the radiator fan 
motor or an open circuit between the fan controller 
and the radiator fan motor.

TROUBLESHOOTING HINTS

• Malfunction of radiator fan motor

• Malfunction of fan controller

DIAGNOSIS

Replace the radiator fan motor and fan controller 
assembly.

Q: Does the radiator fan operate correctly?

AC311284AB

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

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)

AC311277

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

AB

ON-VEHICLE SERVICE

ENGINE COOLING

14-16

YES : 

There is no action to be taken?

NO : 

Repair the wiring harness between the fan 
controller and the radiator fan motor.

INSPECTION PROCEDURE 4: Condenser Fan does not Operate

Radiator Fan and Condenser Fan Drive 
Circuit

Refer to 

P.14-4

.

TECHNICAL DESCRIPTION

The cause could be a malfunction of the condenser 
fan motor or fan controller.

TROUBLESHOOTING HINTS

• Malfunction of condenser fan motor

• Malfunction of fan controller

DIAGNOSIS

STEP 1. Check the condenser fan motor.

Condenser fan motor check. (Refer to GROUP 55, 
Condenser and Condenser Fan Motor 

P.55-223

).

Q: Is the condenser fan motor in good condition?

YES : 

Go to Step 2.

NO : 

Replace the condenser fan motor, then go 
to Step 3.

STEP 2. Check the fan controller.

Refer to 

P.14-18

.

Q: Is the fan controller in good condition?

YES : 

Go to Step 3.

NO : 

Replace the fan motor and fan controller 
(Refer to 

P.14-25

). Then go to Step 3.

STEP 3. Check the symptoms.

Q: Do the condenser fan operate?

YES : 

This symptoms is complete.

NO : 

Return to Step 1.

ON-VEHICLE SERVICE

ENGINE COOLANT LEAK CHECK

M1141001000399

WARNING

When pressure testing the cooling system, 
slowly release cooling system pressure to 
avoid getting burned by hot coolant.

CAUTION

• Be sure to completely clean away any 

moisture from the places checked.

• When the tester is taken out, be careful not to 

spill any coolant.

• Be careful when installing and removing the 

tester and when testing not to deform the 
filler neck of the radiator.

1. Check that the coolant level is up to the filler neck. 

Install a radiator tester and apply 160 kPa 
pressure, and then check for leakage from the 
radiator hose or connections.

2. If there is leakage, repair or replace the 

appropriate part.

ACX01844

Cap adapter

Adapter

AC