Mitsubishi Lancer Evolution 8. Manual — part 169
MPI – TROUBLESHOOTING
13A-62
From previous page
C-50 Engine ECU connector
measurements
• Measure engine ECU terminal
voltage
(1) Voltage across 57 – earth
(Ignition switch OFF)
OK: Battery voltage
(2) Voltage across 57 – earth
(Ignition switch : ON)
OK: 1V or less
Check connectors C-50, B-19X
Check and repair harness
between engine control relay and
engine ECU
• Check earth wire to seen if it is
broken or has short circuit
Check connectors C-50, C-51,
C-21, C-209, C-210, C-201
Check harness between ignition
switch and engine ECU
• Check output wire for damage
Confirm fault symptoms
Intermittent malfunction (ref.
Chapter 00 – Intermittent
Malfunctions)
Check connector C-50
Check harness between engine control relay and engine
ECU
• Check to see if output wire is broken, has a short
circuit, or is damaged
Check engine control relay output power supply harness
and connectors for short circuits
Check connector C-34
Check harness between battery and engine control relay
• Check for any damage to power supply cable
Check harness between engine control relay and engine
ECU
• Check output wire for any damage
Confirm fault symptoms
Replace engine ECU
Intermittent malfunction (ref. Chapter 00 – Intermittent
Malfunctions)
Replace engine ECU
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
NG
NG
NG
NG
NG
NG
NG
NG
(1) NG
(2 NG
NG
NG
NG
OK
Repair
Repair
Repair
Repair
Repair
Repair
Repair
Repair
Repair
MPI – TROUBLESHOOTING
13A-63
Checking Procedure 23
MUT-II/III Actuator Test
07 Fuel pump (ref. P.13A-87)
Check fuel pump relay 1, fuel
pump relay 2, and fuel pump
register (ref. P.13D-112) *
Fuel pump relay 1 measurement
• Undo connector, take
measurement on harness side
(1) Voltage across 3 - earth
OK: Battery voltage
(2) Voltage across 1 - earth
OK: Battery voltage
(3) Resistance across 4 - earth
OK: 2
Ω
or less
To next page
MUT-II/III Actuator Test
13 Fuel pump relay 3 (ref. P.13A-87)
Check fuel pump relay 3
(ref. P.13D-112) *
Fuel pump relay 3 measurement
• Undo connector, then take
measurement on harness side
• Voltage across 2, 4 – earth
(Ignition switch: ON)
OK: Battery voltage
C-50 Engine ECU connector
measurements
• Undo connector and take
measurement on harness side
• Undo C-49 engine ECU
connector and earth terminal 21
• Voltage across 55 –earth
(Ignition switch: ON)
OK: Battery voltage
Check connector C-209, C-31
Check and repair harness
between fuel pump relay 1 and
battery
Check connector C-210
Check harness between fuel
pump relay 1 and ignition switch
Check ignition switch (ref.
Chapter 54 – Ignition Switch)
Check connector C-221
Check and repair harness
between fuel pump relay 1 and
earth
Intermittent malfunction (ref.
Chapter 00 – Intermittent
Malfunctions)
Replace fuel pump relay 3
Check harness between fuel
pump register and fuel pump
relay 3
Check connector C-50
Check harness between fuel
pump relay 3 and fuel pump
register
Replace engine ECU
Check and repair harness
between fuel pump relay 3 and
engine ECU
* Refer to ’01–1 Lancer Evolution VII Workshop Manual (No.1036K02)
Fuel Pump System
Probable causes
• During cranking and driving, engine ECU turns fuel pump relay ON, and
supplies power driving the fuel pump
• When driving with a low load, the engine ECU supplies power, via the
register, to the fuel pump. Also, when driving with a heavy load, power is
supplied directly, and the quantity of fuel sent from the fuel pump
increases
• Fuel pump relay 1 malfunction
• Fuel pump relay 2 malfunction
• Fuel pump relay 3 malfunction
• Fuel pump malfunction
• Fuel pump register malfunctions
• Fuel pump circuit broken, has short circuit, or
poor connector contact
• Engine ECU malfunction
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
NG
NG
NG
NG
NG
NG
NG
OK
NG
NG
NG
NG
NG
(1) NG
(2) NG
(3) NG
Repair
Repair
Repair
Repair
Repair
Repair
Repair
MPI – TROUBLESHOOTING
13A-64
From previous page
C-219 Fuel pump relay - 2
connector measurement
• Undo connector, then take
measurement on harness side
(1) Voltage across 1, 2 - earth
(Ignition switch: ON)
OK: Battery voltage
C-49 Engine ECU connector
measurement
• Undo connector, then take
measurement on harness side
• Voltage across 21 - earth
(Ignition switch: ON)
OK: Battery voltage
C-49 Engine ECU connector
measurement
• Undo connector, then take
measurement on harness side
• Voltage across 21 - earth
(Ignition switch: ON)
OK: Fuel pump operates
(sound of operation is audible)
B-130 Fuel pump register
connector measurement
• Undo connector, then take
measurement on harness side
• Voltage across 1 - earth
(Ignition switch: ON)
OK: Battery voltage
D-10 Fuel pump connector
measurement
• Undo connector, then take
measurement on harness side
(1) Voltage across 5 - earth
(Ignition switch: ON)
OK: Battery voltage
(2) Resistance across 4 - earth
OK: 2
Ω
or less
Check connector D-10
Replace fuel pump
Check and repair harness
between fuel pump relay – 1 and
fuel pump relay - 2
Check connector C-21
Check and repair harness
between fuel pump relay – 2 and
engine ECU
Check connector C-49
Replace engine ECU
Check connector C-21
Check and repair harness
between fuel pump relay – 2 and
fuel pump register
Check connectors D-30, C-131,
C-21, B-130
Check and repair harness
between fuel pump register and
fuel pump
Check connector D-12
Check and repair harness
between fuel pump and body
earth
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
NG
NG
NG
NG
NG
NG
NG
NG
NG
NG
NG
(1) NG
(2) NG
Repair
Repair
Repair
Repair
Repair
Repair
MPI – TROUBLESHOOTING
13A-65
Checking Procedure 24
Check connector A-11X
Check radiator fan control relay
(ref. Chapter 14 – Vehicle Servicing)
Replace fan control relay
A-11X Radiator fan control relay
connector measurement
• Take measurement on
connector side from which relay
was taken out
(1) Resistance across 3 - earth
OK: 2
Ω
or less
(2) Voltage across 1 – earth
(Ignition switch: ON)
OK: Battery voltage
(3) Voltage across 4 – earth
OK: Battery voltage
Check connector A -19
A-19 Fan controller connector
measurement
• Undo connector, then take
measurement on harness side
• Ignition switch: ON
• Voltage across 3 – earth
OK: Battery voltage
To next page
Check and repair harness
between radiator fan control relay
and body earth
• Check for broken or damaged
earth wire
Check connectors C-34,
C-23, B-19X
Check and repair harness
between radiator fan control
relay and engine control relay
• Check to see if power supply
cable is broken or has a short
circuit
Check and repair harness
between battery and radiator fan
control relay
• Check to see if power supply
cable is broken or has short
circuit
Check harness between radiator
fan control relay and fan
controller relay
• Check to see if power supply
cable is broken or has short
circuit
Check connectors C-34, C-23,
B-19X
Check harness between radiator
control relay and engine control
relay
• Check power supply cable for
any damage
Check and repair harness
between radiator control relay
and body earth
• Check earth wire for any
damage
Radiator Fan Control Relay System
Probable causes
When engine control relay is turned ON, the radiator fan control relay
switches ON at the same time, supplying power to the fan controller.
Also, when fan motor drive signal is input to the fan controller from the
ECU, the radiator fan motor operates.
• Radiator fan control relay malfunction
• Fan controller malfunction
• Radiator fan motor malfunction
• Engine ECU malfunction
OK
OK
OK
NG
(1) NG
(2) NG
(3) NG
NG
NG
NG
OK
NG
NG
NG
NG
OK
OK
OK
OK
OK
Repair
Repair
Repair
Repair
Repair
Repair
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст