2007 MITSUBISHI LANCER EVOLUTION engine

MPI -Troubleshooting13A-82
Inspection Procedure 22
Engine-ECU power supply, engine control relay, ignition
switch-IG1 system
Probable cause
When the ignition switch ON signal is input to the engine-ECU, the engine-ECU
turns the engine control relay ON.
This starts the supply of the battery voltage to the engine-ECU, sensor and
actuator.DIgnition switch malfunction
DEngine control relay malfunction
DEngine-ECU malfunction
OK
Check the engine control relay. (Refer to P.13A-132.)NGReplace the engine control relay.
OK
Check the following connector:B-11XNG
Check the battery. (Refer to GROUP 54 - Battery.)NGReplace the battery.
Repair
OK
OK
Measure at the B-11X engine control
relay connector.
DRemove the relay, and measure
at the connector side.
DVoltage between terminal No. 2
and earth
DVoltage between terminal No. 1
and earth
OK:System voltageNGCheck the following connector:A-13NG
OK
Check the harness between the
battery and engine control relay.
DCheck for disconnection and
short-circuit of the power cable.NGRepair
Repair
NGOK
Check and repair the following
connector:C-126Measure at the C-126 engine-ECU
connector.
DMeasure the engine-ECU terminal
voltage.
DIgnition switch: ON
DVoltage between terminal No. 12
and earth
DVoltage between terminal No. 25
and earth
OK:System voltage
To the next page

MPI -Troubleshooting13A-83
OK
Check and repair the harness and
connector of the ignition switch-IG1
output signal for short-circuit.NG
OK
Check the harness between the
ignition switch and engine-ECU.
DCheck for disconnection and
short-circuit of the output cable.Repair
OK
OKNG
Check the ignition switch. (Refer to
GROUP 54 - Ignition switch.)Repair
Measure at the C-115 engine-ECU
connector.
DMeasure the engine-ECU terminal
voltage.
DIgnition switch: ON
DVoltage between terminal No. 82
and earth
OK:System voltageNGCheck the following connector:
C-115NG
Replace the ignition switch.
OK
From the previous page
OK
NGCheck the following connector:
C-126Repair
OK
NG
RepairCheck the following connectors:
C-129, C-209, C-210, C-201
Check and repair the harness
between the engine control relay and
engine-ECU.
DCheck for disconnection and
short-circuit of the earth cable.
OK
Repair(1) NGCheck the following connectors:
C-122, B-11XNG
OK
NG
Replace the engine-ECU.
OKNG
Check the harness between the
ignition switch and engine-ECU.
DCheck for damage of the output
cable.Repair
(2) NGCheck the following connectors:
C-122, C-115, C-129, C-209, C-210,
C-201NG
Intermittent malfunction (Refer to
GROUP 00 - Points to Note for
Intermittent Malfunctions.) OK
OK
Repair
Check the trouble symptoms.
OK
To the next page
Measure at the C-122 engine-ECU
connector.
DMeasure the engine-ECU terminal
voltage.
(1) Voltage between terminal No. 38
and earth
(Ignition switch: OFF)
OK:System voltage
(2) Voltage between terminal No. 38
and earth
(Ignition switch: ON)
OK:1 V or less

MPI -Troubleshooting13A-84
Check the harness and connector of the engine control relay
output power for short-circuit.NG
NG
OK
Check the harness between the engine control relay and
engine-ECU.
DCheck for disconnection, short-circuit and damage of the
output cable.NG
OK
Check the following connector:C-126NG
Intermittent malfunction (Refer to GROUP 00 - Points to Note
for Intermittent Malfunctions.)
From the previous page
Repair
OKRepair
Repair
OK
OK
Check the following connector:A-13NG
Repair
Check the harness between the battery and engine control
relay.
DCheck for damage of the power cable.NG
OKRepair
Check the harness between the engine control relay and
engine-ECU.
DCheck for damage of the output cable.NG
OKRepair
OKCheck the trouble symptoms.
Replace the engine-ECU.

MPI -Troubleshooting13A-85
Inspection Procedure 23
Fuel pump system
Probable cause
DThe engine-ECU turns the fuel pump relay ON during cranking and engine
operation, and supplies the drive power to the fuel pump.
DWhen operating with a low load, the engine-ECU supplies power to the fuel
pump via the resistor. When operating with a high load, power is directly
supplied and the fuel pump fuel discharge amount is increased.DFuel pump relay 1 malfunction
DFuel pump relay 2 malfunction
DFuel pump relay 3 malfunction
DFuel pump resistor malfunction
DFuel pump malfunction
DFuel pump circuit disconnection, short-circuit, or
connector contact defect
DEngine-ECU malfunction
NG
Intermittent malfunction (Refer to
GROUP 00 - Points to Note for
Intermittent Malfunctions.)OKMUT-IIActuator Test
No. 07: Fuel pump
(Refer to P.13A-107.)
NGMUT-IIActuator Test
No. 13: Fuel pump relay 3
(Refer to P.13A-107.)OK
NG
Replace the fuel pump relay 3.NG
NG
Repair
Check the fuel pump relay 1, fuel
pump relay 2 and fuel pump registor.
(Refer to P.13A-132.)
OK
Measure at the B-140 fuel pump
relay 3.
DDisconnect the connector to
measure at the harness side.
DVoltage between terminal No. 2,
terminal No. 4 and earth
(Ignition switch: ON)
OK:System voltageNG
OK
Check the fuel pump relay 3.
(Refer to P.13A-132.)
OK
Check and repair the harness
between the fuel pump resistor and
fuel pump relay 3. OK
NG
Repair OK
NG
Check the trouble symptoms.
RepairOK
Check the harness between the fuel
pump relay 3 and fuel pump resistor.
Replace the engine-ECU.
Check and repair the harness
between the fuel pump relay 3 and
engine-ECU.
Check the following connector:C-122Measure at the C-122 engine-ECU
connector.
DDisconnect the connector to
measure at the harness side.
DDisconnect the C-126
engine-ECU connector, and earth
the terminal No. 22.
DVoltage between terminal No. 126
and earth
(Ignition switch: ON)
OK:System voltageNG
OK
Check the following connectors:
C-209, C-135(1) NG
Repair NG
NG
Check the trouble symptoms.
Check and repair the harness
between the fuel pump relay 1 and
battery.
(2) NGNG
OK
Check the following connector:
C-210Repair
NGCheck the trouble symptoms.
OK
Check the following connectors:
C-223, C-08 ,
C-102 (3) NG
NG
Repair
NG
Check and repair the harness
between the fuel pump relay 1 and
body earth.
Check the trouble symptoms.OK
To the next page
Measure at the C-223 fuel pump
relay 1.
DDisconnect the connector to
measure at the harness side.
(1) Voltage between terminal No. 3
and earth
OK:System voltage
(2) Voltage between terminal No. 1
and earth
(Ignition switch: ON)
OK:Battery voltage
(2) Resistance between terminal No.
4 and earth
OK:2Ωor less
Repair OK
Check the ignition switch. (Refer to
GROUP 54 - Ignition Switch.)
Check the harness between the fuel
pump relay 1 and ignition switch.
NG

MPI -Troubleshooting13A-86
OK
From the previous page
Check and repair the harness
between the fuel pump relay 1 and
fuel pump relay 2. OK
NG
Measure at the C-221 fuel pump
relay 2 connector.
DDisconnect the connector to
measure at the harness side.
(1) Voltage between terminal No. 1,
terminal No. 2 and earth
(Ignition switch: ON)
OK:System voltage
Check and repair the harness
between the fuel pump relay 2 and
engine-ECU.
OK
Check the following connector:C-129 OK
Repair
OK
Measure at the C-126 engine-ECU
connector.
DDisconnect the connector to
measure at the harness side.
DVoltage between terminal No. 22
and earth
(Ignition switch: ON)
OK:System voltageNG
OK
Check the following connector:C-126Repair
NG
Measure at the C-126 engine-ECU
connector.
DDisconnect the connector to
measure at the harness side.
DShort-circuit between terminal No.
22 and earth
(Ignition switch: ON)
OK:The fuel pump operates.
(Operation sounds are
heard.)OK
NG
Check the trouble symptoms.
Replace the engine-ECU.
Check and repair the harness
between the fuel pump relay 2 and
fuel pump resistor.
OK
Check the following connector:C-129Repair
OK
Measure at the B-141 fuel pump
resistor connector.
DDisconnect the connector to
measure at the harness side.
DVoltage between terminal No. 1
and earth
(Ignition switch: ON)
OK:System voltageNGNG
NG
(1) NG
OK
NG
OK
Check the following connectors:
D-29, C-146, C-129, B-141Repair
NG
Check the trouble symptoms.
Check and repair the harness
between the fuel pump resistor and
fuel pump.NG
(2) NG
NG
Measure at the D-09 fuel pump
connector.
DDisconnect the connector to
measure at the harness side.
(1) Voltage between terminal No. 5
and earth
(Ignition switch: ON)
OK:System voltage
(2) Resistance between terminal No.
4 and earth
OK:2Ωor less
OK
NG
Check the trouble symptoms.
Check and repair the harness
between the fuel pump and body
earth.
Check the following connector:D-30Repair
OK
Check the following connector:D-09
NG
Replace the fuel pump.
Check the trouble symptoms.Repair

MPI -Troubleshooting13A-87
Inspection Procedure 24
Radiator fan control relay system
Probable cause
When the engine control relay turns ON, the radiator fan control relay turns ON
simultaneously, and power is supplied to the fan controller.
The radiator fan motor is driven when the fan motor drive signal is input to the
fan controller from the engine-ECU.DRadiator fan control relay malfunction
DFan controller malfunction
DRadiator fan motor malfunction
DEngine-ECU malfunction
OK
(1) NG
OK
DCheck the radiator fan control relay. (Refer to GROUP 14
- On-vehicle Service.)NGReplace the radiator fan control relay.
Check the following connector:A-09XNG
Repair
OK
OK
(2) NGCheck the following connectors:
C-136 , A-13
, C-108, B-11XNG
OK
Check and repair the harness
between the radiator fan control relay
and body earth.
DCheck for disconnection and
damage of the earth cable.
Repair
OK
Check the following connector:A-21
Check and repair the harness
between the radiator fan control relay
and engine control relay.
DCheck for disconnection and
short-circuit of the power cable.
(3) NGCheck and repair the harness
between the battery and radiator fan
control relay.
DCheck for disconnection and
short-circuit of the power cable.
Measure at the A-09X radiator fan
control relay connector.
DRemove the relay, and measure
at the connector side.
(1) Resistance between terminal No.
3 and earth
OK:2Ωor less
(2) Voltage between terminal No. 1
and earth
(Ignition switch: ON)
OK:System voltage
(3) Voltage between terminal No. 4
and earth
OK:System voltage
NG
Repair
OK
Measure at the A-21 fan controller
connector.
DDisconnect the connector to
measure at the harness side.
DIgnition switch: ON
DVoltage between terminal No. 3
and earth
OK:System voltage
To the next pageNG
OK
Check the harness between the
radiator fan control relay and fan
controller.
DCheck for disconnection and
short-circuit of the output cable.NG
Repair
OK
Check the following connectors:
C-136 , A-13
, C-108, B-11XNG
Repair
OK
OK
Check the harness between the
radiator fan control relay and engine
control relay.
DCheck for damage of the power
cable.NG
Repair
Check and repair the harness
between the radiator fan control relay
and body earth.
DCheck for damage of the earth
cable.

MPI -Troubleshooting13A-88
NGRepair
NG
Repair NG
From the previous page
OK
OK
Replace the engine-ECU.
NG
MUT-IIActuator Test
DNo. 21: Fan controller
DIgnition switch: ON
OK:Radiator fan motor rotates.
NG
Check the radiator fan motor drive.
DDisconnect the C-126
engine-ECU connector.
DIgnition switch: ON
OK:Radiator fan motor rotates
at a high speed.OK
OK
Check the harness between the
battery and radiator fan control relay.
DCheck for damage of the power
cable.RepairMeasure at the C-126 engine-ECU
connector.
DDisconnect the connector to
measure at the harness side.
DIgnition switch: ON
DVoltage between terminal No. 21
and earth
OK:4.9 - 5.1 VOK
OK
Check the harness between the
radiator fan control relay and fan
controller.
DCheck for damage of the output
cable.
Replace the radiator fan motor and
fan controller assembly.NG
NG
OK
Check the following connector:
C-136 ,
A-13
OK
Replace the radiator fan motor and
fan controller assembly.
Check the harness between the fan
controller and engine-ECU.
DCheck for short-circuit of the
output cable.Repair NG
OK
Check the following connector:C-126
Repair
Intermittent malfunction (Refer to
GROUP 00 - Points to Note for
Intermittent Malfunctions.)

MPI -Troubleshooting13A-89
Inspection Procedure 25
Condenser fan relay system
Probable cause
The condenser fan relay turns ON with the signal from the engine-ECU, and
power is supplied to the condenser fan motor.DCondenser fan relay (HI) malfunction
DCondenser fan relay (LOW) malfunction
DCondenser fan motor malfunction
DCondenser fan circuit disconnection, short-circuit,
or connector contact defect
DEngine-ECU malfunction
OK
Check and repair the harness
between the condenser fan relay
(LOW) and engine-ECU.
DCheck for disconnection and
damage of the power cable.
(2) NG
OK
OK
Check the condenser fan motor.
(Refer to GROUP 14 - Engine
Cooling.)
OK
NG
OK
Check the following connector:
A-06X
OK
MUT-IIActuator Test
DNo. 38: Condenser fan (LOW)
DIgnition switch: ON
OK:Condenser fan motor ro-
tates (low speed).NG
OK
Measure at the C-122 engine-ECU
connector.
DMeasure the engine-ECU terminal
voltage.
DIgnition switch: ON
DVoltage between terminal No. 34
and earth
(Ignition switch: ON)
OK:System voltageRepair
NG
To the next page
NGReplace the condenser fan relay
(LOW).
OK
Check the condenser fan relay
(LOW). (Refer to GROUP 14 -
On-vehicle service.)
(1) NGMeasure at the A-06X condenser fan
relay (LOW) connector.
DRemove the relay, and measure
at the connector side.
(1) Voltage between terminal No. 2
and earth
(Ignition switch: ON)
OK:System voltage
(2) Voltage between terminal No. 4
and earth
OK:System voltage
NG
Repair OK
OK
Check the following connectors:
C-135, C-102, C-209, C-210
Check and repair the harness
between the condenser fan relay
(LOW) and ignition switch.
DCheck for disconnection and
damage of the power cable.
Check the following connectors:
C-122, C-136 ,
A-43
Check the following connector:
C-201
NG
Check the ignition switch. (Refer to
GROUP 54 - Ignition switch.)
Replace the ignition switch.
Check and replace the harness
between the battery and condenser
fan relay (LOW).
DCheck for disconnection and
damage of the power cable.