2007 MITSUBISHI LANCER EVOLUTION Service Repair Manual

MPI -Troubleshooting13A-93
Inspection Procedure 27
A/C compressor relay system
Probable cause
When the A/C switch ON signal is input to the engine-ECU, the engine-ECU
turns the A/C compressor relay ON.
The A/C compressor magnetic clutch starts with this.DA/C compressor relay malfunction
DA/C compressor magnetic clutch malfunction
DEngine-ECU malfunction
OK
(2) NGCheck the following connector:
C-136 , A-43
NG
Check and repair the harness
between the battery and A/C
compressor relay.
DCheck for disconnection and
short-circuit of the power cable.
OK
Check the A/C compressor relay. (Refer to 55 - On-vehicle
service.)NGReplace the A/C compressor relay.
Check the following connector:B-12XNG
Repair
OK
OK
Measure at the B-12X A/C
compressor relay 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. 1
and earth
OK:System voltage(1) NGCheck the following connectors:
C-128 , C-130
, C-102, C-209,
C-210, C-201NG
OK
Check and repair the harness
between the ignition switch and A/C
compressor relay.
DCheck for disconnection and
short-circuit of the power cable.Repair
OKNG
Measure at the A-47 A/C
compressor connector.
DMeasure the engine-ECU terminal
voltage.
DRemove the B-12X A/C
compressor relay, and
short-circuit between the harness
connector’s terminal No. 1 and
terminal No. 4.
DIgnition switch: ON
DVoltage between terminal No. 1
and earth
OK:System voltage
To the next pageRepair
NG
OK
Check the following connector:A-47
Repair
OK
Check the following connector:
C-136 , A-43
NG
Check and repair the harness
between the A/C compressor relay
and A/C compressor.
DCheck for disconnection and
short - circuit of the output cable.Repair

MPI -Troubleshooting13A-94
OK
OK
Check the harness between the battery and A/C compressor
relay.
DCheck for damage of the power cable.NG
Repair
OK
Check the following connector:C-136 ,
A-43 NG
Repair
NG
Replace the engine-ECU.
NG
Repair
OK
OKMUT-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:OFF
OK
OK
Measure at the C-126 engine-ECU
connector.
DMeasure the engine-ECU terminal
voltage.
DIgnition switch: ON
DVoltage between terminal No. 8
and earth
OK:System voltageNGCheck the following connector:C-126NG
OK
Check the harness between the A/C
compressor relay and engine-ECU.
DCheck for disconnection and
damage of the earth cable.Repair
OK
Check the harness between the ignition switch and A/C
compressor relay.
DCheck for damage of the power cable.NG
Check the following connectors:C-128 ,
C-130 , C-102, C-209, C-210, C-201Repair
From the previous page
Intermittent malfunction (Refer to
GROUP 00 - Points to Note for
Intermittent Malfunctions.)
Repair NG
OK
Check the harness between the A/C compressor relay and
engine-ECU.
DCheck for damage of the earth cable.NG
Repair
OK
Check the harness between the A/C compressor relay and
A/C compressor.
DCheck for damage of the output cable.NG
Repair
Replace the A/C compressor magnetic clutch.

MPI -Troubleshooting13A-95
Inspection Procedure 28
A/C load signal system
Probable cause
The size of the A/C compressor load is detected according to the difference in
set temperature. When the A/C large load signal is input to the engine-ECU, the
engine-ECU judges that the A/C compressor load is large, and controls the
throttle valve control servo so that the idling speed increases.DA/C-ECU malfunction
DEngine-ECU malfunction
OK
NG
OK
NG
Check the trouble symptoms.NG
Check the following connector:C-126Repair
OK
Check the following connector:C-126
Replace the engine - ECU.
Measure at the C-126 engine-ECU
connector.
DMeasure the engine-ECU terminal
voltage.
DEngine: Idling
DA/C switch: ON
(A/C compressor driven state)
DVoltage between terminal No. 24
and earth
DA/C setting temperature: Minimum
temperature
Air volume: Maximum
Outdoor air sensor ambient
temperature: 18_C or more
OK:1 V or less
DA/C setting temperature: indoor
temperature
Air volume: Minimum
OK:System voltage
NG
Repair
NGNG
Repair
OK
OK
Check the harness between the
engine-ECU and A/C-ECU.
DCheck for short-circuit of the
output cable.NG
Repair
Check the A/C system.
(Refer to GROUP 55 -
Troubleshooting.)OK
Intermittent malfunction (Refer to
GROUP 00 - Points to Note for
Intermittent Malfunctions.)
Check the following connectors:
C-16 ,
C-18 , C-20
NG
Repair OK
OK
Check and repair the harness
between the engine-ECU and
A/C-ECU.
DCheck for disconnection of the
output cable.
Check the following connectors:
C-32 ,
C-30 , C-128 drive vehicles>, C-130 vehicles>
Measure at the C-32 A/C-ECU
connector or C-30
A/C-ECU connector A/C>.
DMeasure the A/C-ECU terminal
voltage.
DEngine: Idling
DA/C setting temperature: Minimum
temperature
When room temperature is 25_
or more: Max Cool
When room temperature is 25_
or less: Max. Hot
DA/C switch: ON
DVoltage between terminal No. 2
and earth drive vehicles)>
DVoltage between terminal No. 5
and earth drive vehicles)>
DVoltage between terminal No. 32
and earth
OK:System voltage

MPI -Troubleshooting13A-96
Inspection Procedure 29
Secondary air control solenoid valve system
Probable cause
The secondary air control solenoid valve switches the pressure led into the
secondary air valve between the intake manifold and the atmospheric pressure.DSecondary air control solenoid valve malfunction
DEngine-ECU malfunction
OK
NG
Replace the engine-ECU.
OKIntermittent malfunction (Refer to
GROUP 00 - Points to Note for
Intermittent Malfunctions.)MUT-IIActuator Test
DNo. 36: Secondary air control
solenoid valve
OK:Operation sound is heard,
and there is vibration.OKNG
Repair
OK
NG
Intermittent malfunction (Refer to
GROUP 00 - Points to Note for
Intermittent Malfunctions.)
OK
Check the following connector:
B-142
MUT-IIActuator Test
DNo. 36: Secondary air control
solenoid valve
OK:Operation sound is heard,
and there is vibration.
NG
Repair
NGNG
Repair
OK
Check and repair the harness
between the secondary air control
solenoid valve and engine-ECU.
DCheck for disconnection and
short-circuit of the output cable.
Check the following connectors:
B-14, B-11X
OK
Check the following connector:C-118
Measure at the C-118 engine-ECU
connector.
DDisconnect the connector to
measure at the haness side.
DIgnition switch: ON
DVoltage between terminal No. 53
and earth
OK:System voltageNG
Replace the secondary air control
solenoid valve.Measure at the B-142 secondary air
control solenoid valve connector.
DDisconnect the connector to
measure at the solenoid valve
side.
DResistance between terminal No.
1 and terminal No. 2
OK:29 - 35Ω(at 20_C)
OK
NG
Measure at the B-142 secondary air
control solenoid valve connector.
DDisconnect the connector to
measure at the harness side.
DIgnition switch: ON
DVoltage between terminal No. 1
and earth
OK:System voltage
OKNG
Repair
OK
OK
Check and repair the harness between
the secondary air control solenoid
valve and engine control relay.
DCheck for disconnection and
short-circuit of the power cable.
Check the following connectors:
B-14, B-11X
NG
RepairCheck the harness between the
secondary air control solenoid valve
and engine control relay.
DCheck for damage of the power
cable.NG
Repair
OK
Check the harness between the
secondary air control solenoid valve
and engine-ECU.
DCheck for damage of the output
cable.

MPI -Troubleshooting13A-97
Inspection Procedure 30
Intercooler water spray circuit system
Probable cause
DWhen the intercooler water spray switch (manual) turns ON, the intercooler
water spray manual ON signal is input to the engine-ECU. After receiving
this signal, the engine-ECU turns the intercooler water spray relay ON. The
intercooler water spray motor is driven to inject the water for air cooling into
the intercooler and increase the filling performance.
DWhen the intercooler water spray switch (automatic) turns ON, the intercooler
water spray automatic ON signal is input to the engine-ECU. After receiving
this signal, the engine-ECU turns the intercooler water spray relay ON
intermittently during high - load operation. The intercooler water spray motor is
driven to inject the water for air cooling into the intercooler and increase the
filling performance.DIntercooler water spray switch malfunction
DIntercooler water spray relay malfunction
DIntercooler water spray motor malfunction
DIntercooler water spray relay circuit disconnection,
short - circuit, or connector contact defect
DIntercooler water spray switch circuit disconnection,
short - circuit, or connector contact defect
DIgnition switch malfunction
DEngine-ECU malfunction
NG
Repair OK
Replace the engine-ECU.
OK
NGOK
NG
Repair OK
Check the following connector:D-34
Check the intercooler water spray
switch. (Refer to GROUP 15 -
Intake and Exhaust.)
Check the intercooler water spray
injection.
DIgnition switch: ON
DIntercooler water spray switch
(manual): ON
OK:The intercooler water spray
injects water.
NG
Repair OK
Measure at the D-34 intercooler
water spray switch connector.
DDisconnect the connector to
measure at the harness side.
DIgnition switch: ON
DVoltage between terminal No. 5
and earth
OK:System voltage
NG
OK
Check the harness between the
engine-ECU and intercooler water
spray switch.
DCheck for disconnection and
short-circuit of the signal cable.
Repair
Intermittent malfunction (Refer to
GROUP 00 - Points to Note for
Intermittent Malfunctions.)
NG
OK
Check the harness between the
intercooler water spray switch and
engine-ECU.
DCheck for damage of the earth
cable.
Repair
NG
Repair OK
Replace the engine-ECU.
OK
NGOK
NG
Repair OK
Check the following connector:D-34
Check the intercooler water spray
switch. (Refer to GROUP 15 -
Intake and Exhaust.)
Check the intercooler water spray
injection.
DDisconnect the C-118
engine-ECU connector, and earth
the terminal No. 55.
DIgnition switch: ON
OK:The intercooler water spray
injects water.
NG
Repair OK
Measure at the D-34 intercooler
water spray switch connector.
DDisconnect the connector to
measure at the harness side.
DIgnition switch: ON
DVoltage between terminal No. 3,
terminal No. 5 and earth
OK:System voltage
NG
OK
Check the harness between the
engine-ECU and intercooler water
spray switch.
DCheck for disconnection and
short-circuit of the signal cable.
Repair
Check and repair the harness
between the intercooler water spray
switch and engine-ECU.
DCheck for damage of the signal
cable.
NG
OK
Check the harness between the
intercooler water spray switch and
earth.
DCheck for disconnection and
damage of the earth cable.
Repair
NG
Repair OK
Check the following connector:C-08
OK
Check the following connector:
C-222NG
Repair
OK
To the next page
NGReplace the intercooler water spray
relay.Check the intercooler water spray
relay. (Refer to GROUP 15 - Intake
and Exhaust.)
NG
Check the following connectors:
C-122, C-130
Check the following connectors:
C-115, C-122, C-130NG

MPI -Troubleshooting13A-98
OK
NG
OK
Check the harness between the
intercooler water spray relay and
ignition switch.
DCheck for damage of the power
cable.Repair
OK
OK
Check the following connector:C-135NG
Repair
NG
NG
OK
Measure at the C-118 engine-ECU
connector.
DDisconnect the connector to
measure at the harness side.
DVoltage between terminal No. 55
and earth
(Ignition switch: ON)
OK:System voltageOKCheck the following connectors:
C-130, C-208, C-222NG
NG
OK
Measure at the C-222 intercooler water
spray relay connector.
DDisconnect the connector to
measure at the harness side.
DVoltage between terminal No. 3,
terminal No. 1 and earth
(Ignition switch: ON)
OK:System voltage
Form the previous page
OKRepair
Check the harness between the
intercooler water spray relay and
intercooler water spray motor.
DCheck for disconnection,
short-circuit and damage of the
power cable.
Check the following connectors:
C-209, C-210, C-201, C-208, C-102
NG
Repair
Replace the engine-ECU.
OK
Check the following connectors:
C-209, C-210, C-201, C-208, C-102
NG
Repair
OK
Check and repair the harness
between the intercooler water spray
relay and engine-ECU.
DCheck for disconnection and
short-circuit of the signal cable.
OK
Check the ignition switch. (Refer to
GROUP 54.)
Check the harness between the
intercooler water spray relay and
ignition switch.
DCheck for disconnection and
short-circuit of the power cable.
Repair
NG
OK
Check the harness between the
intercooler water spray motor and
earth.
DCheck for disconnection and
damage of the earth cable.Repair
OK
Check the following connectors:
C-118, C-130NG
Repair
NG
OK
Check and repair the harness between
the intercooler water spray relay and
engine-ECU.
DCheck for damage of the signal
cable.Repair
OK
Check the following connector:A-44NG
Repair
OK
Check the intercooler water spray
motor. (Refer to GROUP 15 - Intake
and Exhaust.)Repair NG

MPI -Troubleshooting13A-99
Inspection Procedure 31
Intercooler water spray lamp system
Probable cause
The engine-ECU illuminates the intercooler water spray lamp when the
intercooler water spray switch (automatic) is ON.DIntercooler water spray lamp bulb dead
DIgnition switch malfunction
DIntercooler water spray lamp circuit disconnection,
short-circuit, or connector contact defect
DIntercooler water spray switch circuit disconnection,
short-circuit, or connector contact defect
DEngine-ECU malfunction
OK
Check and repair the harness
between the combination meter and
engine-ECU.
DCheck for damage of the signal
cable.
NG
OK
Replace the intercooler water spray
lamp.Check whether intercooler water
spray lamp bulb is dead. (Refer to
GROUP 54 - combination meter.)
NGNG
Repair
OK
Check and repair the harness
between the combination meter and
engine-ECU.
DCheck for disconnection and
short-circuit of the signal cable.
Check the following connector:
C-02, C-130
OKMeasure at the C-122 engine-ECU
connector.
DDisconnect the connector to
measure at the harness side.
DIgnition switch: ON
DVoltage between terminal No. 35
and earth
OK:System voltageOK
Check the Inspection Procedure 30:
Intercooler water spray circuit
system. (Refer to P.13A-97.)Check the intercooler water spray
lamp illumination.
DDisconnect the C-122
engine-ECU connector, and earth
the terminal No. 35.
DIgnition switch: ON
OK:The intercooler water spray
lamp illuminates.
NG
NG
Measure at the C-01 combination
meter connector.
DDisconnect the connector to
measure at the harness side.
DIgnition switch: ON
DVoltage between terminal No. 9
and earth
OK:System voltage
OKNG
Repair
OK
Check the following connectors:
C-213, C-210, C-201, C-29 vehicle>
NG
RepairCheck the harness between the
combination meter and ignition
switch.
DCheck for damage of the power
cable.
OK
Check the harness between the
combination meter and ignition
switch.
DCheck for disconnection and
short-circuit of the power cable.Repair
Replace the ignition switch.
OK
Check the following connectors:
C-213, C-210, C-201, C-01, C-29
NG
Repair
OK
Check the following connectors:
C-02, C-122, C-130NG
RepairNG

MPI -Troubleshooting13A-100
Inspection Procedure 32
Ignition coil (integrated power transistor) system
Probable cause
The engine-ECU allows the ignition coil primary current to flow intermittently by
turning the power transistor in the unit OFF and ON.DIgnition coil malfunction
DSpark plug malfunction
DSpark plug cable malfunction
DIgnition primary circuit disconnection, short-circuit, or
connector contact defect
DEngine-ECU malfunction
OK
Check and repair the harness between
the ignition coil and engine-ECU.
DCheck for disconnection of the
output cable.
OK
To the next page
(3) NGCheck and repair the harness between
the ignition coil and body earth.
DCheck for disconnection and
damage of the earth cable.
NG
Replace the engine-ECU.
OK
Check the trouble symptoms.OKIntermittent malfunction
(Refer to GROUP 00 - Points to Note
for Intermittent Malfunctions.) NG
OK
Check the harness between the
ignition coil and engine-ECU.
DCheck for disconnection of the
output cable.Repair NG
NG
Check the following connector:
C-126Repair
(2) NGMeasure at the C-126 engine-ECU
connector.
DMeasure the engine-ECU terminal
voltage.
DDisconnect the connectors B-114
and B-119.
DEngine: Cranking
(1) Voltage between terminal No. 10,
terminal No. 23 and earthOKCheck the following connector:
C-126
OK
Check and repair the harness between
the ignition coil and ignition coil relay.
DCheck for short-circuit of the power
cable.
OK
Check the ignition coil relay.
(Refer to GROUP 16 - Engine
Electrical.)
OK
Measure at the B-119 and B-123
ignition coil connectors.
DDisconnect the connector to
measure at the harness side.
(1) Voltage between terminal No. 1 and
earth
(Ignition switch: ON)
OK:System voltage
(2) Voltage between terminal No. 3 and
earth
(Engine: Cranking)
OK:0.5 - 4.0 V
(3) Resistance between terminal No. 2
and earth
OK:2Ωor less(1) NGCheck the following connector:
B-09XNG
Repair
OK
Check the ignition coil.
(Refer to GROUP 16 - Ignition Device.)OKReplace the ignition coil.
OK
Check the following connectors:
B-114, B-119NG
Repair
OK
Check the spark plug.
(Refer to GROUP 16 - Ignition Device.)NGReplace the spark plug.
Check the spark plug cable.
(Refer to GROUP 16 - Ignition Device.)NGReplace the spark plug cable.
NG
Repair