Mitsubishi Lancer Evolution 8. Manual — part 170
MPI – TROUBLESHOOTING
13A-66
From previous page
Check connector C-49
Check radiator fan motor
operation
• Undo C-49 engine ECU
connector
• Ignition switch: ON
OK: Radiator fan motor runs at
high speed
C-49 Engine ECU measurement
• Undo connector, then take
measurement on harness side
• Ignition switch: ON
• Voltage across 18 – earth
OK: 4.9 ~ 5.1V
Check connector C-34
Check harness between fan
controller and engine ECU
• Check output wire to see if it
has any shorts
Replace radiator fan motor and
fan controller ASSY
MUT-II/III Actuator test
• No.21: fan controller
• Ignition switch: ON
OK: Radiator fan motor operates
Replace engine ECU
Check harness between battery
and radiator fan control relay
• Check for any damage to power
supply cable
Check harness between radiator
fan control relay and fan
controller
• Check for any damage to power
supply cable
Replace radiator fan motor and
fan controller ASSY
Intermittent malfunction (ref.
Chapter 00 – Intermittent
Malfunctions)
OK
OK
OK
OK
NG
NG
NG
NG
NG
NG
OK
OK
OK
NG
OK
OK
NG
Repair
Repair
Repair
Repair
Repair
MPI – TROUBLESHOOTING
13A-67
Checking Procedure 25
Check condenser fan motor
(ref. Chapter 14 – Engine
Cooling)
MUT-II/II Actuator test
• No 38: Condenser fan
(LO)
• Ignition switch: ON
OK: Condenser fan motor
operates (low speed)
Check connector A-08X
Condenser fan relay (LO) check
(ref. Chapter 14 – Vehicle
Servicing)
A-08X Condenser fan relay (LO)
connector measurement
• Take measurement on
connector side from which relay
was disconnected
(1) Voltage across 2 - earth
(Ignition switch: ON)
OK: Battery voltage
(2) Voltage across 4 – earth
OK: Battery voltage
C-49 Engine ECU connector
measurement
• Measure engine ECU terminal
voltage
• Ignition switch: ON
• Voltage across 31 –earth
(Ignition switch: ON)
OK: Battery voltage
Check connector C-201
Check ignition switch (ref.
Chapter 54 – Ignition Switch)
Replace ignition
switch
Check connectors C-31, C-119,
C-209, C-210
Check and repair harness
between condenser fan relay
(LO) and ignition switch
• Check to see if power supply
cable is broken or damaged
Check and repair harness
between battery and condenser
fan relay
• Check to see if power supply
cable is broken or damaged
Replace condenser fan relay (LO)
Check connectors C-49,C-34
Check and repair harness between
condenser fan relay (LO) and engine
ECU
• Check to see if power supply cable
is broken or damaged
To next page
Condenser Fan Relay
Probable causes
The signal from the engine ECU turns the condenser fan relay ON,
supplying power to the condenser fan motor.
• Condenser fan relay (HI) malfunction
• Condenser fan relay (LO) malfunction
• Condenser fan motor malfunction
• Condenser fan circuit broken, has a short
circuit, or there is poor connector contact
• Engine ECU malfunction
NG
NG
NG
NG
(2) NG
NG
(1) NG
OK
OK
OK
OK
OK
OK
NG
OK
OK
OK
OK
Repair
Repair
MPI – TROUBLESHOOTING
13A-68
From previous page
MUT-II/III Actuator Test
• No 37: Condenser fan
(HI)
• Ignition switch: ON
OK: Condenser fan motor
operates (high speed)
Replace engine ECU
A-36 Condenser fan motor
connector measurement
• Undo connector, then take
measurement on harness side
• Undo C-49 engine ECU
connector, and earth terminal 31
• Ignition switch: ON
• Voltage across 2 –earth
OK: Battery voltage
Check connector A-36
Check harness between
condenser fan relay (LO) and
engine ECU
• Check for any damage to power
supply cable
Replace engine ECU
Check connector A-09X
Condenser fan relay check (HI)
check (ref. Chapter - 14 Vehicle
Servicing)
A-09X Condenser fan relay (HI)
connector measurement
• Take measurement on
connector side from which relay
was disconnected
(1) Voltage across 2 - earth
(Ignition switch: ON)
OK: Battery voltage
(2) Voltage across 4 – earth
OK: Battery voltage
To next page
Check and repair harness
between condenser fan relay
(LO) and engine ECU
• Check to see if power supply
cable is broken
Replace condenser fan relay (HI)
Check connector C-201
Check ignition switch (ref.
Chapter 54 – Ignition Switch)
Replace
ignition switch
Check connectors C-31, C-119,
C-209, C-210
Check and repair harness
between condenser fan relay
(LOW) and ignition switch
• Check to see if power supply
cable is broken or damaged
Check and repair harness
between battery and condenser
fan relay
• Check to see if power supply
cable is broken or damaged
OK
OK
NG
NG
NG
NG
NG
NG
NG
OK
OK
(1) NG
OK
OK
OK
OK
OK
OK
OK
(2) NG
OK
OK
Repair
Repair
Repair
Repair
MPI – TROUBLESHOOTING
13A-69
From previous page
C-49 Engine ECU connector
measurement
• Measure engine ECU terminal
voltage
• Ignition switch: ON
• Voltage across 30 –earth
(Ignition switch: ON)
OK: Battery voltage
A-36 Condenser fan motor
connector measurement
• Undo connector, then take
measurement on harness side
• Undo C-49 engine ECU
connector, and earth terminal 30
• Ignition switch: ON
• Voltage across 1 - earth
OK: Battery voltage
Check connector A-36
Check harness between
condenser fan relay (HI) and
engine ECU
• Check for any damage to power
supply cable
Replace engine ECU
Check connectors C-49, C-34
Check and repair harness
between condenser fan relay (HI)
and engine ECU
• Check to see if power supply
cable is broken or damaged
Check and repair harness
between condenser fan relay (HI)
and engine ECU
• Check to see if power supply
cable is broken
OK
OK
OK
OK
OK
OK
NG
NG
NG
NG
Repair
Repair
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