Mitsubishi Electric Lancer Evolution-VII Workshop Manual page 1216

Inspection Procedure 19
Overheating
Causes shown on right are suspected.
MUT-II Self-Diag Code
Is a diagnosis code output?
Check the engine coolant.
(Refer to GROUP 14 - On-vehicle Service.)
<Note>
If the engine coolant level is low, check whether the engine
coolant has leaked, and repair if required.
MUT-II Actuator Test
D No. 21: Fan controller
D Ignition switch: ON
OK: Radiator fan rotates.
MUT-II Actuator Test
D No. 37: Condenser fan (HI)
D No. 38: Condenser fan (LOW)
D Ignition switch: ON
MUT-II Data list
OK: Condenser fan rotates (low speed).
21 Engine coolant temperature sensor (Refer to P.13A-102.)
OK: Condenser fan rotates (high speed).
MUT-II Data list
D No. 21: Engine coolant temperaure sensor
OK: Approximately the same as the ambient temperature
when cooled.
Between 80 - 120_C when hot.
Check the thermostat. (Refer to GROUP 14 - Thermostat.)
Check the water pump. (Refer to GROUP 14 - Water pump.)
Replace the radiator core.
MPI -
Troubleshooting
NO
OK
OK
OK
OK
OK
OK
Probable cause
D Engine coolant insufficient or deteriorated
D Fan controller malfunction
D Engine coolant temperature sensor malfunction
D Thermostat malfunction
D Water pump malfunction
D Condenser fan relay malfunction
D Radiator core malfunction
D Engine-ECU malfunction
YES
INSPECTION CHART FOR DIAGNOSIS CODE (Refer to
P.13A-12.)
NG
Replace or replenish the engine coolant.
NG
Check the Inspection Procedure 24: Radiator fan control relay
system. (Refer to P.13A-87.)
NG
Check the Inspection Procedure 25: Condenser fan control
relay system. (Refer to P.13A-89.)
NG
Check the Code No. P0115: Engine coolant temperature
sensor system. (Refer to P.13A-19.)
NG
Replace the thermostat.
NG
Replace the water pump.
13A-79