Mitsubishi ENGINE COOLING SPECIFICATIONS
ENGINE
COOLING
14-1
CONTENTS
GENERAL INFORMATION 2..................
SERVICE SPECIFICATIONS 2.................
LUBRICANT 2...............................
SEALANTS 2................................
SPECIAL TOOL 3............................
TROUBLESHOOTING 3.......................
ON-VEHICLE SERVICE 8.....................
Engine Coolant Leak Checking 8................
Radiator Cap Opening Pressure
Check 8.......................................
14109000208
Engine Coolant Replacement 9..................
Concentration Measurement 10..................
Fan Controller Check 10........................
Fan Control Relay Continuity Check 11..........
THERMOSTAT 12...........................
WATER PUMP
<4G6> 14................................
<4G9> 15................................
WATER HOSE AND WATER PIPE 16........
RADIATOR 19...............................
14-2
ENGINE COOLING -
General Information/Service Specifications/Lubricant/Sealants
GENERAL INFORMATION
The cooling system is designed to keep every part
of the engine at appropriate temperature in
whatever condition the engine may be operated.
The cooling method is of the water-cooled, pressure
forced circulation type in which the water pump
pressurizes coolant and circulates it throughout the
engine. If the coolant temperature exceeds the
prescribed temperature, the thermostat opens to
circulate the coolant through the radiator as well
so that the heat absorbed by the coolant may be
radiated into the air.
Items Specifications
Radiator Performance kJ/h 4G6 205,116
A/T oil cooler Performance kJ/h 5,860
The water pump is of the centrifugal type and is
driven by the timing belt or drive belt from the
crankshaft.
The radiator is the corrugated fin, down flow type
and is cooled by the electrical radiator fan.
The cooling fans are controlled by a fan controller
and the engine-ECU depending on driving
conditions.
4G9 171,628
SERVICE SPECIFICATIONS
Items Standard value Limit
14100010217
14100030091
Radiator cap opening pressure kPa 74 - 103 64
Range of coolant antifreeze concentration of radiator % 30 - 60 -
Thermostat Valve opening temperature of thermostat_C 85±1.5 -
Full-opening temperature of thermostat_C 98 -
Valve lift (at 95_C) mm 8.5 or more -
LUBRICANT
Items Quantity L
MITSUBISHI GENUINE COOLANT!or 4G6 7
equivalent
4G9 6
SEALANTS
Items Specified sealant Remarks
Cylinder block drain plug 3M Nut Locking Part No. 4171 or equivalent Drying sealant
Water pump <4G9>
Thermostat case assembly
Mitsubishi Genuine Parts No. MD970389 or
equivalent
Semi-drying sealant
14100040148
14100050172
ENGINE COOLING -
Special Tool/Troubleshooting
14-3
SPECIAL TOOL
Tool Number Name Use
A
MB991223
A: MB991219
B: MB991220
C: MB991221
D: MB991222
B
C
D
Harness set
A: Test harness
B: LED harness
C: LED harness
adapter
D: probe
14100060038
Measurement of terminal voltage
A: Connector pin contact pressure inspection
B: Power circuit inspection
C: Power circuit inspection
D: Commercial tester connection
TROUBLESHOOTING
INSPECTION CHART FOR TROUBLE SYMPTOMS
Trouble symptoms Inspection procedure
No.
Radiator fan and condenser fan do not operate. <Vehicles with A/C>
Radiator fan does not operate. <Vehicles without A/C>
Radiator fan and condenser fan do not change speed or stop.
<Vehicles with A/C>
Radiator fan does not change speed or stop. <Vehicles without A/C>
Radiator fan does not operate. <Vehicles with A/C> 3 14-7
Condenser fan does not operate. <Vehicles with A/C> 4 14-7
INSPECTION PROCEDURE FOR TROUBLE SYMPTOMS
Inspection Procedure 1
Radiator fan and condenser fan do not operate.
<Vehicles with A/C>
Radiator fan does not operate. <Vehicles without A/C>
The cause could be a malfunction of the fan controller power supply or earth circuit.
The cause could also be a malfunction of the fan controller or the engine-ECU.
1 14-3
2 14-6
Probable cause
Malfunction of fusible link
D
Malfunction of fan control relay
D
Malfunction of fan controller
D
Malfunction of engine-ECU
D
Malfunction of wiring harness or connector
D
14100560019
Reference page
14-4
<Vehicles with A/C>
ENGINE COOLING -
Troubleshooting
D Fusible link (7) check
D Fan control relay check (Refer to P.14-11.)
OK
Measure at the fan control relay connector A-20X.
D Remove the relay, and measure at the harness side connector.
(1) Voltage between 4 and body earth
OK:
(2) Voltage between 3 and body earth (Ignition switch: ON)
(3) Continuity between 1 and body earth
Measure at the fan controller connector A-37.
D Disconnect the connector, and measure at the harness side
(1).Voltage between 3 and body earth (Ignition switch: ON)
(2).Continuity between 1 and body earth
Measure at the engine-ECU connector B - 54.
D Connect the connector.
D Voltage between 21 and body earth
Battery voltage
OK:
Battery voltage
OK:
Continuity
OK
connector.
OK:
Battery voltage
OK:
Continuity
OK
(Engine: idling, A/C switch: ON)
OK:
0.7 V or more (When A/C compressor is operating)
OK
NG
(1) NG
(2) NG
(3) NG
(1) NG
(2) NG
NG
Replace
Check the harness wire between fan control relay and fusible link
(7), and repair if necessary.
Check the harness wire between fan control relay and engine control
relay, and repair if necessary.
Check the harness wire between fan control relay and body earth,
and repair if necessary.
Check the harness wire between fan controller and fan control
relay, and repair if necessary.
Check the harness wire between fan controller and body earth,
and repair if necessary.
Check the harness wire between fan controller and engine-ECU.
OK
Engine-ECU terminal voltage check (Refer to GROUP 13 - Troubleshooting.)
OK
NG
Repair
NG
Replace
Measure at the engine-ECU connector B - 54.
D Connect the connector.
D Pull out the terminal No.21 to disconnect it (Ignition switch: ON)
OK:
The radiator fan motor and condenser fan motor operate.
YES
Engine-ECU terminal voltage check (Refer to GROUP 13 - Troubleshooting.)
Check the automatic compressor-ECU, and repair if necessary.
(Refer to GROUP 55 - Troubleshooting.)
NO
Replace the radiator fan motor and fan controller assembly.
<Vehicles without A/C>
ENGINE COOLING -
Troubleshooting
14-5
D Fusible link (7) check
D Fan control relay check (Refer to P.14-11.)
OK
Measure at the fan control relay connector A-20X.
D Remove the relay, and measure at the harness side connector.
(1) Voltage between 4 and body earth
OK:
(2) Voltage between 3 and body earth (Ignition switch: ON)
(3) Continuity between 1 and body earth
Measure at the fan controller connector A-37.
D Disconnect the connector, and measure at the harness side
(1) Voltage between 3 and body earth (Ignition switch: ON)
(2) Continuity between 1 and body earth
Measure at the engine-ECU connector B-54.
D Connect the connector.
D Voltage between 21 and body earth (Engine: idling)
Battery voltage
OK:
Battery voltage
OK:
Continuity
OK
connector.
OK:
Battery voltage
OK:
Continuity
OK
OK:
0.7 V or more (When radiator fan is operating)
OK
NG
(1) NG
(2) NG
(3) NG
(1) NG
(2) NG
NG
Replace
Check the harness wire between fan control relay and fusible link
(7), and repair if necessary.
Check the harness wire between fan control relay and engine control
relay, and repair if necessary.
Check the harness wire between fan control relay and body earth,
and repair if necessary.
Check the harness wire between fan controller and fan control
relay, and repair if necessary.
Check the harness wire between fan controller and body earth,
and repair if necessary.
Check the harness wire between fan controller and engine-ECU.
OK
Engine-ECU terminal voltage check (Refer to GROUP 13 - Troubleshooting.)
NG
Repair
Measure at the engine-ECU connector B-54.
D Connect the connector.
D Pull out the terminal No.21 to disconnect it (Ignition switch: ON)
OK:
The radiator fan motor operates.
YES
Engine-ECU terminal voltage check (Refer to GROUP 13 - Troubleshooting.)
NO
Replace the radiator fan motor and fan controller assembly.
14-6
Inspection Procedure 2
ENGINE COOLING -
Troubleshooting
Radiator fan and condenser fan do not change speed or
stop. <Vehicles with A/C>
Radiator fan does not change speed or stop.
<Vehicles without A/C>
The fan controller carries outstep-free control of the radiator fan motor and the condenser
fan motor speeds using signals transmitted from the engine-ECU.
<Vehicles with A/C>
Fan control relay check (Refer to P.14-11.)
OK
D Check the harness wire between fan control relay and engine
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
Measure at the engine-ECU connector B-54.
D Connect the connector.
D Voltage between 21 and body earth
(Engine: idling, engine coolant temperature: 80_C or less)
OK:
0 - 0.3 V (Engine: idling, A/C switch: ON)
OK:
0.7 V or more (When A/C compressor is operating)
OK
NG
NG
NG
Probable cause
D Malfunction of fan control relay
D Malfunction of fan controller
D Malfunction of engine-ECU
D Malfunction of wiring harness or connector
Replace
Repair
Check the harness wire between fan controller and engine-ECU.
NG
OK
Engine-ECU terminal voltage check (Refer to GROUP 13 - Troubleshooting.)
OK
Repair
NG
Replace
Fan controller check (Refer to P.14-10.)
OK
Measure at the engine-ECU connector B-54.
D Connect the connector.
D Pull out the terminal No.21 to disconnect it (Ignition switch: ON)
OK:
D Connect the terminal No.21 to the body earth (Ignition switch: ON)
Engine-ECU terminal voltage check (Refer to GROUP 13 - Troubleshooting.)
The radiator fan motor and condenser fan motor operate.
OK:
The radiator fan motor and condenser fan motor stop.
YES
NG
Check the automatic compressor-ECU, and repair if necessary.
(Refer to GROUP 55 - Troubleshooting.)
Replace the radiator fan motor and fan controller assembly.
NO
Replace the radiator fan motor and fan controller assembly.
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