2007 MITSUBISHI LANCER EVOLUTION Service Repair Manual

MPI -Troubleshooting13A-77
Inspection Procedure 18
Battery dies
Probable cause
Causes shown on right are suspected.DBattery malfunction
DG terminal short - circuit
DAlternator malfunction
DEngine-ECU malfunction
OK
To the next page
OK
Check the following connector:
C-122NG
Repair
OK
Replace the alternator.NG
OK
Check the harness between the
alternator and ignition switch.
DCheck for damage of the power
cable.Repair NG
OK
Check the harness between the
alternator intermediate connector and
alternator.
DCheck for disconnection and
short-circuit of the power cable.Repair NG
OK
Check the harness between the
alternator intermediate connector and
alternator.
DCheck for short-circuit of the output
cable.Repair
OK
Measure at the B-14 alternator
intermediate connector.
DDisconnect the connector to
measure at the male connector
side.
DIgnition switch: ON
DVoltage between terminal No. 10
and earth
OK:System voltageNGCheck the following connector:
B-22NG
Repair
OK
Check and repair the harness between
the alternator intermediate connector
and ignition switch.
DCheck for disconnection and
short-circuit of the power cable.
OK
Measure at the B-14 alternator
intermediate connector.
DDisconnect the connector to
measure at the female connector
side.
DIgnition switch: ON
DVoltage between terminal No. 9 and
earth
OK:System voltageNGCheck the following connectors:
C-130, C-01, C-213, C-29 drive vehicles>NG
Repair
OK
Check the following connector:
B-14NG
Repair
Check the battery.
(Refer to GROUP 54 - Battery.)NGReplace the battery.

MPI -Troubleshooting13A-78
NG
Replace the engine-ECU.
OK
Check the trouble symptoms.OKIntermittent malfunction
(Refer to GROUP 00 - Points to Note
for Intermittent Malfunctions.)
OK
Measure at the C-122 engine-ECU
connector.
DMeasure the engine-ECU terminal
voltage.
DEngine: Idling (after warm-up)
DRadiator fan: Stopped
DVoltage between terminal No. 33
and earth
OK:Voltage rises 0.2 to 3.5 V
when headlamp is turned
OFF and ON.NGCheck the charging device.
(Refer to GROUP 16 - Charging
Device.)
OK
Measure at the C-122 engine-ECU
connector.
DDisconnect the connector to
measure at the harness side.
DIgnition switch: ON
DVoltage between terminal No. 33
and earth
OK:System voltageNGCheck and repair the harness between
the alternator intermediate connector
and engine-ECU.
DCheck for short-circuit of output
cable.
From the previous page

MPI -Troubleshooting13A-79
Inspection Procedure 19
Overheating
Probable cause
Causes shown on right are suspected.DEngine coolant insufficient or deteriorated
DFan controller malfunction
DEngine coolant temperature sensor malfunction
DThermostat malfunction
DWater pump malfunction
DCondenser fan relay malfunction
DRadiator core malfunction
DEngine-ECU malfunction
NO
NG
Replace or replenish the engine coolant.
OK
Replace the radiator core.
OK
Check the water pump. (Refer to GROUP 14 - Water pump.)NGReplace the water pump.
OK
Check the thermostat. (Refer to GROUP 14 - Thermostat.)NGReplace the thermostat.
OK
MUT-IIData list
DNo. 21: Engine coolant temperaure sensor
OK:Approximately the same as the ambient temperature
when cooled.
Between 80 - 120_C when hot.NGCheck the Code No. P0115: Engine coolant temperature
sensor system. (Refer to P.13A-19.)
MUT-IIData list
21 Engine coolant temperature sensor (Refer to P.13A-102.)
OK
MUT-IIActuator Test
DNo. 37: Condenser fan (HI)
DNo. 38: Condenser fan (LOW)
DIgnition switch: ON
OK:Condenser fan rotates (low speed).
OK:Condenser fan rotates (high speed).NGCheck the Inspection Procedure 25: Condenser fan control
relay system. (Refer to P.13A-89.)
MUT-IIActuator Test
DNo. 21: Fan controller
DIgnition switch: ON
OK:Radiator fan rotates.NGCheck the Inspection Procedure 24: Radiator fan control relay
system. (Refer to P.13A-87.)
OK
Check the engine coolant.
(Refer to GROUP 14 - On-vehicle Service.)

If the engine coolant level is low, check whether the engine
coolant has leaked, and repair if required.
MUT-IISelf-Diag Code
Is a diagnosis code output?YESINSPECTION CHART FOR DIAGNOSIS CODE (Refer to
P.13A-12.)

MPI -Troubleshooting13A-80
Inspection Procedure 20
Abnormal radiator fan motor rotation
Probable cause
Causes shown on right are suspected.DFan controller malfunction
DEngine-ECU malfunction
Intermittent malfunction (Refer to
GROUP 00 - Points to Note for
Intermittent Malfunctions.)OK
Replace the engine-ECU.
OK
Check the radiator fan motor drive.
DDisconnect the C-126
engine-ECU connector.
DShort-circuit terminal No. 21 with
the earth.
DIgnition switch: ON
OK:Radiator fan motor stops.NGCheck the trouble symptoms.
Check the following connector:
C-126NG
Repair
OK
NG
Measure 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 - 5.1VReplace the fan controller. NG
OK
NG
Repair
NGRepair
Replace the fan controller.
Check the following connectors:A-13, A-21
Check the harness between the fan controller and engine-ECU.
DCheck for disconnection of the output cable.OK
OK

MPI -Troubleshooting13A-81
Inspection Procedure 21
A/C ineffective
Probable cause
Causes shown on right are suspected.DA/C refrigerant insufficient or over - charged
DA/C compressor relay malfunction
DCondenser fan system malfunction
DA/C-ECU malfunction
DEngine-ECU malfunction
NGCheck the Inspection Procedure 25: Condenser fan control
relay system. (Refer to P.13A-89.)
NGAdjust the A/C refrigerant charge amount.
(Refer to GROUP 55 - On-vehicle Service.)
MUT-IISelf-Diag cord
Is a diagnosis code output?YESINSPECTION CHART FOR DIAGNOSIS CODE (Refer to
P.13A-12.)
Refer to GROUP 55 -
Troubleshooting.
OK
OK
Check the A/C compressor magnetic
clutch operation.
DEngine: Idling
DA/C setting temperature
When room temperature is 25_
or more: Max Cool
When room temperature is 25_
or less: Max. Hot
DA/C switch: ON
OK:Magnetic clutch operates.
DA/C switch: OFF
OK:Magnetic clutch does not
operate.NGMUT-IIData list
DNo. 28: A/C switch
DEngine: Idling
DA/C setting temperature
When room temperature is 25_
or more: Max Cool
When room temperature is 25_
or less: Max Hot
DA/C switch: ON
OK:ON
DA/C switch: OFF
OK:OFFNGCheck the Inspection Procedure 26:
A/C switch system. (Refer to
P.13A-92.)
NO
OK
MUT-IIData list
DNo. 49: A/C relay
DEngine: Idling
DA/C setting temperature
When room temperature is 25_
or more: Max Cool
When room temperature is 25_
or less: Max. Hot
DA/C switch: ON
OK:ON
DA/C switch: OFF
OK:OFFNGCheck the Inspection Procedure 27:
A/C compressor relay system. (Refer
to P.13A-93.)
Check the A/C refrigerant charge amount.
(Refer to GROUP 55 - On-vehicle Service.)
OK
OK
Check the Inspection Procedure 28: A/C load signal system.
(Refer to P.13A-95.)
MUT-IIActuator Test
DNo. 37: Condenser fan (HI)
DNo. 38: Condenser fan (LOW)
DIgnition switch: ON
OK:Condenser fan rotates (low speed).
OK:Condenser fan rotates (high speed).

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.