Egine Cooling Space Runner
Egine Cooling Space Runner
ENGINE
COOLING
CONTENTS 14109000208
SEALANTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 THERMOSTAT . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
The cooling system is designed to keep every part The water pump is of the centrifugal type and is
of the engine at appropriate temperature in driven by the timing belt or drive belt from the
whatever condition the engine may be operated. crankshaft.
The cooling method is of the water-cooled, pressure The radiator is the corrugated fin, down flow type
forced circulation type in which the water pump and is cooled by the electrical radiator fan.
pressurizes coolant and circulates it throughout the The cooling fans are controlled by a fan controller
engine. If the coolant temperature exceeds the and the engine-ECU depending on driving
prescribed temperature, the thermostat opens to conditions.
circulate the coolant through the radiator as well
so that the heat absorbed by the coolant may be
radiated into the air.
Items Specifications
4G9 171,628
LUBRICANT 14100040148
Items Quantity L
SEALANTS 14100050172
Cylinder block drain plug 3M Nut Locking Part No. 4171 or equivalent Drying sealant
Water pump <4G9> Mitsubishi Genuine Parts No. MD970389 or Semi-drying sealant
Thermostat case assembly equivalent
ENGINE COOLING - Special Tool/Troubleshooting 14-3
SPECIAL TOOL 14100060038
TROUBLESHOOTING 14100560019
Radiator fan and condenser fan do not operate. <Vehicles with A/C> 1 14-3
Radiator fan does not operate. <Vehicles without A/C>
Radiator fan and condenser fan do not change speed or stop. 2 14-6
<Vehicles with A/C>
Radiator fan does not change speed or stop. <Vehicles without A/C>
Replace
YES NO
Engine-ECU terminal voltage check (Refer to GROUP 13 - Trouble- Replace the radiator fan motor and fan controller assembly.
shooting.)
ENGINE COOLING - Troubleshooting 14-5
<Vehicles without A/C>
NG
D Fusible link (7) check Replace
D Fan control relay check (Refer to P.14-11.)
OK
(1) NG
Measure at the fan control relay connector A-20X. Check the harness wire between fan control relay and fusible link
D Remove the relay, and measure at the harness side connector. (7), and repair if necessary.
(1) Voltage between 4 and body earth (2) NG
OK: Battery voltage Check the harness wire between fan control relay and engine control
(2) Voltage between 3 and body earth (Ignition switch: ON) relay, and repair if necessary.
OK: Battery voltage
(3) Continuity between 1 and body earth (3) NG
Check the harness wire between fan control relay and body earth,
OK: Continuity and repair if necessary.
OK
(1) NG
Measure at the fan controller connector A-37. Check the harness wire between fan controller and fan control
D Disconnect the connector, and measure at the harness side relay, and repair if necessary.
connector. (2) NG
(1) Voltage between 3 and body earth (Ignition switch: ON) Check the harness wire between fan controller and body earth,
OK: Battery voltage and repair if necessary.
(2) Continuity between 1 and body earth
OK: Continuity
OK
NG
Measure at the engine-ECU connector B-54. Check the harness wire between fan controller and engine-ECU.
D Connect the connector. OK NG
D Voltage between 21 and body earth (Engine: idling)
OK: 0.7 V or more (When radiator fan is operating) Repair
OK
Engine-ECU terminal voltage check (Refer to GROUP 13 - Trouble-
shooting.)
Engine-ECU terminal voltage check (Refer to GROUP 13 - Trouble- Replace the radiator fan motor and fan controller assembly.
shooting.)
14-6 ENGINE COOLING - Troubleshooting
Inspection Procedure 2
Radiator fan and condenser fan do not change speed or Probable cause
stop. <Vehicles with A/C>
Radiator fan does not change speed or stop.
<Vehicles without A/C>
The fan controller carries out step-free control of the radiator fan motor and the condenser D Malfunction of fan control relay
fan motor speeds using signals transmitted from the engine-ECU. D Malfunction of fan controller
D Malfunction of engine-ECU
D Malfunction of wiring harness or connector
OK Replace
NG
Fan controller check (Refer to P.14-10.) Replace the radiator fan motor and fan controller assembly.
OK
Engine-ECU terminal voltage check (Refer to GROUP 13 - Trouble- Replace the radiator fan motor and fan controller assembly.
shooting.)
ENGINE COOLING - Troubleshooting 14-7
<Vehicles without A/C>
NG
Fan control relay check (Refer to P.14-11.) Replace
OK
NG
D Check the harness wire between fan control relay and engine Repair
control relay.
D Check the harness wire between fan control relay and body
earth.
D Check the harness wire between fan control relay and fan
controller.
OK
NG
Measure at the engine-ECU connector B-54. Check the harness wire between fan controller and engine-ECU.
D Connect the connector. OK NG
D Voltage between 21 and body earth
(Engine: idling, engine coolant temperature: 80_C or less) Repair
OK: 0 - 0.3 V (Engine: idling)
OK: 0.7 V or more (When radiator fan is operating)
Engine-ECU terminal voltage check (Refer to GROUP 13 - Trouble-
OK shooting.)
NG
Fan controller check (Refer to P.14-10.) Replace the radiator fan motor and fan controller assembly.
OK
Engine-ECU terminal voltage check (Refer to GROUP 13 - Trouble- Replace the radiator fan motor and fan controller assembly.
shooting.)
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 D Malfunction of radiator fan motor
the fan controller and the radiator fan motor. D Open circuit between fan controller and radiator fan
motor
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. D Malfunction of condenser fan motor
D Malfunction of fan controller
D Malfunction of wiring harness or connector
NG NG
Condenser fan motor check (Refer to Condenser fan motor connector Repair
GROUP 55.) OK
OK NG
Check the trouble symptom. Replace the condenser fan motor.
Replace the radiator fan motor and fan
controller assembly.
14-8 ENGINE COOLING - On-vehicle Service
Cap adapter
ENGINE COOLANT LEAK CHECKING
1. Confirm that the coolant level is up to the filler neck.
Adapter Install a radiator cap tester 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 filler neck
of the radiator.
2. If there is leakage, repair or replace the appropriate part.
<4G9>
<4G6> <4G9> 5. 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
6. Securely tighten the radiator drain plug.
7. Install the reserve tank.
44 Nm 39 Nm
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
9.
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.
1 2 3 4
When current is
supplied
14-12 ENGINE COOLING - Thermostat
THERMOSTAT 14100240265
<4G6>
3
2
13 Nm
<4G9>
3
2
13 Nm
Removal steps
AA" "BA 1. Radiator lower hose connection "AA 3. Thermostat
2. Water inlet fitting
ENGINE COOLING - Thermostat 14-13
REMOVAL SERVICE POINT
AA" RADIATOR LOWER HOSE DISCONNECTION
After making mating marks on the radiator hose and the hose
clamp, disconnect the radiator hose.
INSPECTION 14100250275
THERMOSTAT CHECK
1. Immerse the thermostat in water, and heat the water while
stirring. Check the thermostat valve opening temperature.
Standard value:
Valve opening temperature: 85 ± 1.5_C
4
2
1
Bolt specifications
8 ´ 80
3
24 Nm
13 Nm 8 ´ 14
8 ´ 25
8 ´ 22
Screw diameter ´ length mm
Removal steps
1. Alternator brace
2. Water pump
3. Water pump gasket
"AA 4. O-ring
10 - 12 Nm
Sealant:
Mitsubishi Genuine Part No.
MD970389 or equivalent
2
24 Nm
Removal steps
1. Timing belt rear left cover
"AA 2. Water pump
1
13 Nm
2
6
3
24 Nm
5 4
9
9 10
13 Nm
8
Sealant:
Mitsubishi Genuine Part No.
MD970389 or equivalent
Removal steps
AA" "CA 1. Radiator upper hose connection 6. Water inlet fitting
AA" "CA 2. Radiator lower hose connection "BA 7. Thermostat case assembly
3. Water hose 8. Heater hose connection
4. Water hose "AA 9. O-ring
5. Water hose 10. Water inlet pipe
ENGINE COOLING - Water Hose and Water Pipe 14-17
<4G9>
Pre-removal and Post-installation Operation
D Engine Coolant Draining and Suppling
(Refer to P.14-9.)
D Engine Cover Removal and Installation
D Air Cleaner Assembly and Air Intake Hose Removal
and Installation
6 5 2
22 - 25 Nm
3
14 Nm
6 4
6
14 Nm
7
Sealant:
Mitsubishi Genuine Part No.
MD970389 or equivalent
Removal steps
AA" "CA 1. Radiator lower hose connection D Intake manihold
2. Water temperature gauge unit (Refer to GROUP 15)
connector 6. Water hose
"BA 3. Thermostat case assembly 7. Water inlet pipe assembly
"AA 4. O-ring "AA 8. O-ring
5. Heater hose connection
14-18 ENGINE COOLING - Water Hose and Water Pipe
INSPECTION 14100340118
12 Nm
2 9
9
14
15 17 16
10
5
3
1 7 12
11
5 Nm
11 8
4
13
6