Mitsubishi Lancer Evolution 8. Manual — part 168
MPI – TROUBLESHOOTING
13A-58
From previous page
C-49 Engine ECU connector
measurements
• Measure engine ECU terminal
voltage
• Engine idling (after warm up)
• Radiator fan: not operating
• Voltage across 8 – earth
OK: Voltage increases 0.2 ~ 3.5V
when headlamps go from
OFF
ON
Confirm fault symptoms
Replace engine ECU
Check battery charging device
(ref. Chapter 16 Battery Charging
Devices)
Intermittent malfunction (ref.
Chapter 00 – Intermittent
Malfunctions)
MUT-II/III Diagnosis Codes
• Has diagnosis code been output?
Check engine cooling water
(ref. Chapter 14 Vehicle Servicing)
<Remarks>
When there is a significant decrease in engine cooling
water, check to see if water is leaking from anywhere
and, if necessary, repair
MUT-II/III Actuator Test
• No.21: Fan controller
• Ignition switch: ON
OK: Radiator fan operating
MUT-II/III Actuator Test
• No.37: Condenser fan (HI)
• No.38: Condenser fan (LOW)
Ignition SW: ON
OK: condenser fan operates (low speed)
OK: condenser fan operates (high speed)
MUT-II/III Service Data
• No.21: Water temp. sensor
OK: when cold, it is about the same as ambient air temp.
When hot, 80 ~ 120°C
Thermostat check
(ref. Chapter 14 Thermostat)
Check water pump
Replace radiator core
Diagnosis Code List (ref. P.13A-5)
Change or add engine cooling water.
Checking procedure 24: Radiator fan control relay
system check (P.13A-65)
Checking procedure 25: Condenser fan control relay
system check (ref. P.13A-67)
Code no. P0115: water temp. sensor system check
(ref.P13A-14)
Replace thermostat
Replace water pump
Overheating
Probable causes
The probable causes are noted right.
• Engine cooling water insufficient or deteriorated
• Fan controller malfunction
• Water temp. sensor malfunction
• Thermostat malfunction
• Water pump malfunction
• Condenser fan relay malfunction
• Radiator core malfunction
• Engine ECU malfunction
Checking Procedure 19
OK
OK
OK
NG
NG
YES
NG
NO
OK
OK
OK
OK
OK
OK
NG
NG
NG
NG
NG
MPI – TROUBLESHOOTING
13A-59
Checking Procedure 20
Check connector C-39
Check radiator fan motor
operation
• Undo C-49 engine ECU
connector
• Terminal 18 short to earth
• Ignition switch: ON
OK: Radiator fan motor stops
Confirm fault symptoms
Replace engine ECU
Intermittent malfunction (ref.
Chapter 00 – Intermittent
Malfunctions)
C-49 Engine ECU connector measurement
• Undo connector, take measurement on harness side
• Ignition switch: OFF
• Voltage across 18 – earth
OK: 4.9 ~ 5.1V
Check connectors C-34, A-19
Check harness between fan controller and engine ECU
• Check if output wire is broken
Replace fan controller
Replace fan controller
Radiator Fan Motor Running Abnormally
Probable causes
The probable causes are noted right.
• Fan controller malfunction
• Engine ECU malfunction
NG
NG
NG
NG
NG
OK
OK
OK
NG
OK
OK
OK
Repair
Repair
Repair
MPI – TROUBLESHOOTING
13A-60
Checking Procedure 21
MUT-II/III Diagnosis Codes
• Has diagnosis code been output?
Diagnosis Code List (ref. P.13A-5)
Check A/C compressor magnet
clutch operation
• Engine idling
• A/C set temp
When cabin temp. 25ºC or
more:
Max. Cool
When cabin temp. 25ºC or less:
Max. Hot
• A/C switch: ON
OK: magnet clutch operates
• A/C switch OFF
OK: magnet clutch does not
operate
MUT-II/III Service Data
• No.28: A/C switch
• Engine idling
• A/C set temp.
When cabin temp. 25ºC or more:
Max. Cool
When cabin temp. 25ºC or less:
Max. Hot
• A/C switch: ON
OK: ON
• A/C switch OFF
OK: OFF
MUT-II/III Service Data
• No.49: A/C relay
• Engine idling
• A/C set temp.
When cabin temp. 25ºC or more:
Max. Cool
When cabin temp. 25ºC or less:
Max. Hot
• A/C switch: ON
OK: ON
• A/C switch OFF
OK: OFF
Ref. Chapter 55 – Troubleshooting
Checking procedure 26: A/C
switch system check (ref. P.13A-
70)
Checking procedure 27: A/C
compressor relay system check
(ref. P.13A-71)
Check A/C coolant charging
(ref. Chapter 55 – Vehicle Servicing)
MUT-II/III Actuator Test
• No.37: Condenser fan (HI)
• No.38: Condenser fan (LOW)
• Ignition SW: ON
OK: condenser fan operates (low speed)
OK: condenser fan operates (high speed)
Checking procedure 28: A/C load signal system check
(ref. P.13A-73)
Adjust A/C coolant charging
(ref. Chapter 55 – Vehicle Servicing)
Checking procedure 25: Condenser fan control relay
system check
(ref. P.13A-67)
A/C ineffective
Probable causes
The probable causes are noted right.
• A/C coolant malfunction or overfilled
• A/C compressor relay malfunction
• Condenser fan system malfunction
• A/C-ECU malfunction
• Engine ECU malfunction
YES
NO
NG
NG
OK
OK
OK
OK
OK
NG
NG
NG
MPI – TROUBLESHOOTING
13A-61
Checking Procedure 22
Check battery
(ref. Chapter 54A – Battery)
Check connector B-19X
Check engine control relay (P.13D-112) *
Replace battery
Replace engine control relay
B-19X Engine control relay
connector measurement
• Take measurement on
connector side from which relay
was taken out
• Voltage across 2 - earth
• Voltage across 1 – earth
OK: Battery voltage
C-50 Engine ECU connector
measurement
• Engine ECU terminal voltage
measurement
• Ignition switch: ON
• Voltage across 47 – earth
• Voltage across 59 – earth
OK: battery voltage
Check connector C-50
C-51 Engine ECU connector
measurement
• Measure engine ECU terminal
voltage
• Ignition switch: ON
• Voltage across 99 - earth
OK: Battery voltage
To next page
Check connector C-34
Check and repair harness
between battery and engine
control relay
• Check if power supply cable is
broken or has short circuit
Check and repair connector
C-50
Check connector C-51
Check ignition switch (ref.
Chapter 54A – Ignition switch
system)
Check connectors C-21, C-209,
C-210, C-201
Check harness between ignition
switch and engine ECU
• Check to see if output wire
is broken or has short
circuit
Check harness and connectors
between ignition switch and IG1
output signal for any short circuits
and repair
Replace ignition switch
Engine ECU Power Supply, Engine Control Relay, Ignition Switch IG1
System
Probable causes
When ignition switch ON signal is input to ECU, the engine ECU turns
engine control relay ON.
As a result, a battery voltage is supplied to engine ECU, sensor, and
actuator
• Ignition switch malfunction
• Engine control relay malfunction
• Engine ECU malfunction
* Refer to ’01–1 Lancer Evolution VII Workshop Manual (No.1036K02)
NG
NG
NG
NG
NG
NG
NG
NG
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
NG
NG
NG
NG
OK
Repair
Repair
Repair
Repair
Repair
Repair
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