Mitsubishi Lancer Evolution 7. Manual — part 199
MPI -
Troubleshooting
13A-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.
D
A/C-ECU malfunction
D
Engine-ECU malfunction
OK
NG
OK
NG
Check the trouble symptoms.
NG
Check the following connector: C-126
Repair
OK
Check the following connector: C-126
Replace the engine-ECU.
Measure at the C-126 engine-ECU
connector.
D
Measure the engine-ECU terminal
voltage.
D
Engine: Idling
D
A/C switch: ON
(A/C compressor driven state)
D
Voltage between terminal No. 24
and earth
D
A/C setting temperature: Minimum
temperature
Air volume: Maximum
Outdoor air sensor ambient
temperature: 18_C or more
OK: 1 V or less
D
A/C setting temperature: indoor
temperature
Air volume: Minimum
OK: System voltage
NG
Repair
NG
NG
Repair
OK
OK
Check the harness between the
engine-ECU and A/C-ECU.
D
Check 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 <manual A/C> ,
C-18 <automatic A/C>, C-20
NG
Repair
OK
OK
Check and repair the harness
between the engine-ECU and
A/C-ECU.
D
Check for disconnection of the
output cable.
Check the following connectors:
C-32 <manual A/C> ,
C-30 <automatic A/C>, C-128 <R.H.
drive vehicles>, C-130 <L.H. drive
vehicles>
Measure at the C-32 A/C-ECU
connector <manual A/C> or C-30
A/C-ECU connector <automatic
A/C>.
D
Measure the A/C-ECU terminal
voltage.
D
Engine: Idling
D
A/C setting temperature: Minimum
temperature
When room temperature is 25_
or more: Max Cool
When room temperature is 25_
or less: Max. Hot
D
A/C switch: ON
D
Voltage between terminal No. 2
and earth <manual A/C (R.H.
drive vehicles)>
D
Voltage between terminal No. 5
and earth <manual A/C (L.H.
drive vehicles)>
D
Voltage between terminal No. 32
and earth <automatic A/C>
OK: System voltage
MPI -
Troubleshooting
13A-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.
D
Secondary air control solenoid valve malfunction
D
Engine-ECU malfunction
OK
NG
Replace the engine-ECU.
OK
Intermittent malfunction (Refer to
GROUP 00 - Points to Note for
Intermittent Malfunctions.)
MUT-II Actuator Test
D
No. 36: Secondary air control
solenoid valve
OK: Operation sound is heard,
and there is vibration.
OK
NG
Repair
OK
NG
Intermittent malfunction (Refer to
GROUP 00 - Points to Note for
Intermittent Malfunctions.)
OK
Check the following connector:
B-142
MUT-II Actuator Test
D
No. 36: Secondary air control
solenoid valve
OK: Operation sound is heard,
and there is vibration.
NG
Repair
NG
NG
Repair
OK
Check and repair the harness
between the secondary air control
solenoid valve and engine-ECU.
D
Check 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.
D
Disconnect the connector to
measure at the haness side.
D
Ignition switch: ON
D
Voltage between terminal No. 53
and earth
OK: System voltage
NG
Replace the secondary air control
solenoid valve.
Measure at the B-142 secondary air
control solenoid valve connector.
D
Disconnect the connector to
measure at the solenoid valve
side.
D
Resistance between terminal No.
1 and terminal No. 2
OK: 29 - 35 Ω (at 20_C)
OK
NG
Measure at the B-142 secondary air
control solenoid valve connector.
D
Disconnect the connector to
measure at the harness side.
D
Ignition switch: ON
D
Voltage between terminal No. 1
and earth
OK: System voltage
OK
NG
Repair
OK
OK
Check and repair the harness between
the secondary air control solenoid
valve and engine control relay.
D
Check for disconnection and
short-circuit of the power cable.
Check the following connectors:
B-14, B-11X
NG
Repair
Check the harness between the
secondary air control solenoid valve
and engine control relay.
D
Check for damage of the power
cable.
NG
Repair
OK
Check the harness between the
secondary air control solenoid valve
and engine-ECU.
D
Check for damage of the output
cable.
MPI -
Troubleshooting
13A-97
Inspection Procedure 30
Intercooler water spray circuit system
Probable cause
D
When 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.
D
When 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.
D
Intercooler water spray switch malfunction
D
Intercooler water spray relay malfunction
D
Intercooler water spray motor malfunction
D
Intercooler water spray relay circuit disconnection,
short-circuit, or connector contact defect
D
Intercooler water spray switch circuit disconnection,
short-circuit, or connector contact defect
D
Ignition switch malfunction
D
Engine-ECU malfunction
NG
Repair
OK
Replace the engine-ECU.
OK
NG
OK
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.
D
Ignition switch: ON
D
Intercooler 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.
D
Disconnect the connector to
measure at the harness side.
D
Ignition switch: ON
D
Voltage between terminal No. 5
and earth
OK: System voltage
NG
OK
Check the harness between the
engine-ECU and intercooler water
spray switch.
D
Check 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.
D
Check for damage of the earth
cable.
Repair
NG
Repair
OK
Replace the engine-ECU.
OK
NG
OK
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.
D
Disconnect the C-118
engine-ECU connector, and earth
the terminal No. 55.
D
Ignition switch: ON
OK: The intercooler water spray
injects water.
NG
Repair
OK
Measure at the D-34 intercooler
water spray switch connector.
D
Disconnect the connector to
measure at the harness side.
D
Ignition switch: ON
D
Voltage 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.
D
Check for disconnection and
short-circuit of the signal cable.
Repair
Check and repair the harness
between the intercooler water spray
switch and engine-ECU.
D
Check for damage of the signal
cable.
NG
OK
Check the harness between the
intercooler water spray switch and
earth.
D
Check for disconnection and
damage of the earth cable.
Repair
NG
Repair
OK
Check the following connector: C-08
OK
Check the following connector:
C-222
NG
Repair
OK
To the next page
NG
Replace 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-130
NG
MPI -
Troubleshooting
13A-98
OK
NG
OK
Check the harness between the
intercooler water spray relay and
ignition switch.
D
Check for damage of the power
cable.
Repair
OK
OK
Check the following connector: C-135
NG
Repair
NG
NG
OK
Measure at the C-118 engine-ECU
connector.
D
Disconnect the connector to
measure at the harness side.
D
Voltage between terminal No. 55
and earth
(Ignition switch: ON)
OK: System voltage
OK
Check the following connectors:
C-130, C-208, C-222
NG
NG
OK
Measure at the C-222 intercooler water
spray relay connector.
D
Disconnect the connector to
measure at the harness side.
D
Voltage between terminal No. 3,
terminal No. 1 and earth
(Ignition switch: ON)
OK: System voltage
Form the previous page
OK
Repair
Check the harness between the
intercooler water spray relay and
intercooler water spray motor.
D
Check for disconnection,
short-circuit and damage of the
power cable.
Check the following connectors:
C-209, C-210, C-201, C-208, C-102
<L.H. drive vehicles>
NG
Repair
Replace the engine-ECU.
OK
Check the following connectors:
C-209, C-210, C-201, C-208, C-102
<L.H. drive vehicles>
NG
Repair
OK
Check and repair the harness
between the intercooler water spray
relay and engine-ECU.
D
Check 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.
D
Check for disconnection and
short-circuit of the power cable.
Repair
NG
OK
Check the harness between the
intercooler water spray motor and
earth.
D
Check for disconnection and
damage of the earth cable.
Repair
OK
Check the following connectors:
C-118, C-130
NG
Repair
NG
OK
Check and repair the harness between
the intercooler water spray relay and
engine-ECU.
D
Check for damage of the signal
cable.
Repair
OK
Check the following connector: A-44
NG
Repair
OK
Check the intercooler water spray
motor. (Refer to GROUP 15 - Intake
and Exhaust.)
Repair
NG
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