Mitsubishi Outlander (2003+). Manual - part 126

TROUBLESHOOTING

ENGINE COOLING

14-15

(7) Disconnect engine-ECU connector or 

engine-A/T-ECU connector C-134 <4G63> or 
C-139 <4G69>, and push in connector terminal 
pin 21 <4G63> or 17 <4G69> 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 controller (Refer to 

P.14-29

). Then go to Step 8.

STEP 7. MUT-II/III self-diag code

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

P.13A-9

) <4G63> 

or (Refer to GROUP 13B - Trouble shooting 

P.13B-10

) <4G69>.

Q: Diagnosis code set?

YES : 

Inspection chart for diagnosis code (Refer 

to GROUP 13A - Trouble shooting 

P.13A-16

) <4G63> or Inspection chart for 

diagnosis code (Refer to GROUP 13B - 
Trouble shooting 

P.13B-20

) <4G69>.

NO : 

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

P.13A-343

) <4G63> or (Refer to 

GROUP 13B, Engine-ECU and 
Engine-A/T-ECU 

P.13B-439

) <4G69>. 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

DIAGNOSIS

STEP 1. Check the radiator fan motor.

Refer to 

P.14-20

.

Q: Is the radiator fan motor in good condition?

YES : 

Go to Step 2.

NO : 

Replace the radiator fan motor (Refer to 

P.14-29

). 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 controller (Refer to 

P.14-29

). Then go to Step 3.

STEP 3. Check the symptoms.

Q: Do the radiator fan operate?

YES : 

This symptoms is complete.

NO : 

Return to Step 1.

TROUBLESHOOTING

ENGINE COOLING

14-16

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.55A-76

).

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 controller (Refer to 

P.14-29

). 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 COOLING

14-17

ON-VEHICLE SERVICE

ENGINE COOLANT LEAK CHECK

M1141001000355

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.

RADIATOR CAP VALVE OPENING 
PRESSURE CHECK

M1141001300431

NOTE: Be sure that the cap is clean before 
testing. Rust or other foreign material on the cap 
seal will cause an improper reading.

1. Use a cap adapter to attach the cap to the tester.

2. Increase the pressure until the indicator of the 

gauge stops moving.
Minimum limit: 83 kPa
Standard value: 93 

−

 123 kPa

3. Replace the radiator cap if the reading does not 

remain at or above the limit.

ENGINE COOLANT REPLACEMENT

M1141001200520

WARNING

When removing the radiator cap, use care to 
avoid contact with hot coolant or steam. 
Place a shop towel over the cap and turn the 
cap counterclockwise a little to let the 
pressure escape through the vinyl tube. 
After relieving the steam pressure, remove 
the cap by slowly turning it 
counterclockwise.

1. Drain the water from the radiator, heater core and 

engine after unplugging the radiator drain plug 
and removing the radiator cap.

2. Drain the water in the water jacket by unplugging 

the drain plug of the cylinder block. On 4WD, 
drain engine coolant from the water return tube 
assembly of the transfer.

3. Remove the reserve tank and drain the coolant.

ACX01844

Cap adapter

Adapter

AC

AC211643 AB

Cap adapter

AC200630AD

<2WD>

Cylinder block
drain plug

Intake manifold

AC301654

Water return tube assembly

30 ± 3 N·m

<4WD>

AC

ON-VEHICLE SERVICE

ENGINE COOLING

14-18

4. Drain the coolant then clean the path of the 

coolant by injecting water into the radiator from 
the radiator cap area.

5. Apply the designated sealant to the screw area of 

the cylinder block drain plug, and then tighten to 
the standard torque.
Specified sealant: 3M Nut Locking Part 

No.4171 or equivalent

Tightening torque: 44 

±

 5 N

⋅

m

6. Securely tighten the drain plug of the radiator.
7. Assemble the reserve tank.

CAUTION

Do not use alcohol or methanol anti-freeze or any 
engine coolants mixed with alcohol or methanol 
anti-freeze. The use of an improper anti-freeze 
can cause corrosion of the aluminium 
components.

8. By referring to the section on coolant, select an 

appropriate concentration for safe operating 
temperature within the range of 30 to 60 %. Use 
special tool LLC changer (MB991871) to refill the 
coolant. A convenient mixture is a 50 % water and 
50 % antifreeze solution (freezing point: 

−

31

°

C).

Recommended antifreeze: DIAQUEEN SUPER 

LONG LIFE COOLANT or equivalent

Quantity: 7.0 L
NOTE: For how to use special tool MB991871, 
refer to its manufacturer’s instructions.

9. Reinstall the radiator cap.
10.Start the engine and let it warm up until the 

thermostat opens.

11.After repeatedly revving the engine up to 3,000 

r/min several times, then stop the engine.

12.Remove the radiator cap after the engine has 

become cold, and pour in coolant up to the brim. 
Reinstall the cap.

CAUTION

Do not overfill the reserve tank.
13.Add coolant to the reserve tank between the 

"FULL" and "LOW" mark if necessary.

CONCENTRATION MEASUREMENT

M1141001100426

Measure the temperature and specific gravity of the 
engine coolant to check the antifreeze concentration.

Standard value: 30 

−

 60 % (allowable 

concentration range)

Recommended antifreeze: DIAQUEEN SUPER 

LONG LIFE COOLANT or equivalent

CAUTION

If the concentration of the anti-freeze is below 30 
%, the anti-corrosion property will be adversely 
affected. In addition, if the concentration is 
above 60 %, both the anti-freezing and engine 
cooling properties will decrease, affecting the 
engine adversely. For these reasons, be sure to 
maintain the concentration level within the 
specified range.

FAN CONTROLLER CHECK

M1141007400083

1. Remove the fan controller connector.
2. Turn the ignition switch to the "ON" position, and 

measure the voltage between the harness-side 
connector terminals.

Standard value: System voltage

AC304677

Cylinder block
drain plug

AE

AC200579AC

MB991871

Air hose

AC103011

2

3

1

Fan controller

AD