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Mitsubishi Pajero Pinin. Manual - part 134

ENGINE COOLING –

Troubleshooting

14-7

<Vehicles without A/C>

Repair

Engine-ECU terminal voltage check (Refer to GROUP 13 – Trou-
bleshooting.)

YES

Engine-ECU terminal voltage check (Refer to GROUP 13 – Trou-
bleshooting.)

Replace the radiator fan motor and fan controller assembly.

Measure at the engine-ECU connectors C-17.

Connect the connector.

Pull out the terminal No.18 to disconnect it (Ignition switch: ON)
OK: The radiator fan motor operates.

Connect the terminal No.18 to the body earth (Ignition switch: ON)
OK: The radiator fan motor stops.

Fan controller check (Refer to P.14-10.)

Replace the radiator fan motor and fan controller assembly.

Measure at the engine-ECU connectors C-17.

Connect the connector.

Voltage between 18 and body earth
(Engine: idling, engine coolant temperature: 80

C or less)

OK: 0 – 0.3 V (Engine: idling)
OK: 0.7 V or more (When radiator fan is operating)

Check the harness wire between fan controller and engine-ECU.

Check the harness wire between fan control relay and engine
control relay.

Check the harness wire between fan control relay and body
earth.

Check the harness wire between fan control relay and fan
controller.

Repair

Fan control relay check (Refer to P.14-11.)

Replace

Inspection Procedure 3

Radiator fan does not operate. <Vehicles with A/C>

Probable cause

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

Malfunction of radiator fan motor

Open circuit between fan controller and radiator fan
motor

Replace the radiator fan motor and fan controller assembly.

Inspection Procedure 4

Condenser fan does not operate. <Vehicles with A/C>

Probable cause

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

Malfunction of condenser fan motor

Malfunction of fan controller

Malfunction of wiring harness or connector

Replace the radiator fan motor and fan
controller assembly.

Check the trouble symptom.

Replace the condenser fan motor.

Condenser fan motor check (Refer to
GROUP 55.)

Condenser fan motor connector

Repair

ENGINE COOLING –

On-vehicle Service

14-8

ON-VEHICLE SERVICE

ENGINE COOLANT LEAK CHECKING

Confirm that the coolant level is up to the filler neck. Install
a radiator cap tester, adapter and cap adapter to the filler
neck, and apply 160 kPa pressure, and then check for
leakage from the radiator hose or connections.

Caution
(1) Be sure to completely clean away any moisture

from the places checked.

(2) When the tester is taken out, be careful not to

spill any coolant from it.

(3) Be careful, when installing and removing the tester

and when testing, not to deform the radiator filler
neck.

If there is leakage, repair or replace the appropriate part.

RADIATOR CAP VALVE OPENING PRESSURE
CHECK

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

Increase the pressure until the indicator of the gauge stops
moving.

Standard value: 75 – 105 kPa

Limit: 65 kPa

Replace the radiator cap if the reading does not remain
at or above the limit.

NOTE
Be sure that the cap is clean before testing, since rust
or other foreign material on the cap seal will cause an
improper indication.

Cap adapter

Adapter

Cap adapter

ENGINE COOLING –

On-vehicle Service

14-9

ENGINE COOLANT REPLACEMENT

Drain the engine coolant by removing the drain plug and
then the radiator cap.

Remove the drain plug from the cylinder block to drain
the engine coolant.

Remove the reserve tank to drain the engine coolant.

When the engine coolant has drained, pour in water from
the radiator cap to clean the engine coolant line.

Coat the thread of the cylinder block drain plug with the
specified sealant and tighten to the specified torque.

Specified sealant:

3M Nut Locking Part No. 4171 or equivalent

Securely tighten the radiator drain plug.

Install the reserve tank.

Slowly pour the engine coolant into the mouth of the radiator
until the radiator is full, and pour also into the reserve
tank up to the FULL line.

Recommended antifreeze:

MITSUBISHI GENUINE COOLANT or equivalent

Quantity: 6

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 the corrosion of the aluminium components.

Install the radiator cap securely.

10. Start the engine and warm the engine until the thermostat

opens. (Touch the radiator hose with your hand to check
that warm water is flowing.)

11. After the thermostat opens, race the engine several times,

and then stop the engine.

12. Cool down the engine, and then pour engine coolant into

the reserve tank until the level reaches the FULL line.
If the level is low, repeat the operation from step 11.

Cylinder block drain plug

39 Nm

ENGINE COOLING –

On-vehicle Service

14-10

CONCENTRATION MEASUREMENT

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

Standard value: 30 – 60% (allowable concentration range)

RECOMMENDED ANTIFREEZE

Antifreeze

Allowable concentration

MITSUBISHI GENUINE COOLANT
or equivalent

30 – 60%

Caution
If the concentration of the antifreeze 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

Disconnect the condenser fan motor connector.

Start the engine and run it at idle.

Turn the A/C switch to ON and maintain the coolant
temperature at 80

C or less.

When measuring the voltage between the fan
controller-side connector terminals, check that the value
changes repeatedly as indicated by (1) – (3) below.
(1) 0 V
(2) 8.2

2.6 V

(3) Battery voltage

2.6 V

If the voltage does not repeatedly change as indicated,
replace the radiator fan motor and the fan controller
assembly.

Fan controller

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