Mitsubishi Eclipse. Manual — part 707

EMISSION CONTROL

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ENGINE AND EMISSION CONTROL

17-109

EVAPORATIVE EMISSION VENTILATION
SOLENOID CHECK

M1173007800143

Refer to Evaporative Emission Canister and Fuel Tank Pres-
sure Relief Valve

− Inspection − Over Vent Valve Module Check

P.17-118

.

EXHAUST GAS RECIRCULATION (EGR) SYSTEM

GENERAL DESCRIPTION (EXHAUST GAS RECIRCULATION SYSTEM)

M1173005200275

The exhaust gas recirculation (EGR) system lowers
the nitrogen oxides (NOx) emission level. When the
air/fuel mixture combustion temperature is high, a
large quantity of NOx is generated in the combustion
chamber. Therefore, this system recirculates part of
exhaust gas from the exhaust port of the cylinder
head to the combustion chamber through the intake
manifold to decrease the air/fuel mixture combustion
temperature, resulting in reduction of NOx. The EGR
flow rate is controlled by the EGR valve for
driveability quality.

OPERATION

When the engine coolant temperature is low, when
the engine is at idle or when a wide open throttle
operation is performed, the EGR valve is kept
closed, achieving no EGR.
After warming up of the engine, the EGR valve can
be opened by the engine control module (ECM) or
powertrain control module (PCM).
The ECM or PCM monitors the EGR system and illu-
minates the check engine/malfunction indicator lamp
to indicate that there is a malfunction.

EMISSION CONTROL

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ENGINE AND EMISSION CONTROL

17-110

SYSTEM DIAGRAM
<2.4L ENGINE>

AKX01310

VACUUM CONTROL VALVE

ON

OFF

EGR VACUUM REGULATOR
SOLENOID VALVE

MFI RELAY

BATTERY

ECM <M/T>
PCM <A/T>

VOLUME AIRFLOW
SENSOR

ENGINE COOLANT
TEMPERATURE SENSOR

CRANKSHAFT POSITION
SENSOR

EGR VALVE

AD

EMISSION CONTROL

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ENGINE AND EMISSION CONTROL

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<3.0L ENGINE>

COMPONENT LOCATION

M1173007600194

AKX00353

VACUUM CONTROL VALVE

ON

OFF

MFI RELAY

BATTERY

ECM <M/T>
PCM <A/T>

VOLUME AIRFLOW
SENSOR

ENGINE COOLANT
TEMPERATURE SENSOR

CRANKSHAFT POSITION
SENSOR

EGR VALVE

AD

EGR VACUUM REGULATOR
SOLENOID VALVE

AK103688

EGR VACUUM REGULATOR
SOLENOID VALVE
<2.4L ENGINE>

AE

AKX01313AC

EGR VALVE
<2.4L ENGINE>

EMISSION CONTROL

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ENGINE AND EMISSION CONTROL

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EXHAUST GAS RECIRCULATION SYSTEM
CHECK

M1173002600337

1. Disconnect the vacuum hose (black) from the exhaust gas

recirculation (EGR) valve, and then connect a hand vacuum
pump via the Tee-fitting.

2. Start the engine. As described in the chart below, check the

vacuum condition when the throttle valve is opened
suddenly (revving) during cold and hot engine conditions.

When engine is cold
[Engine coolant temperature: 20

°C (68°F) or less]

When engine is hot
[Engine coolant temperature: 80

°C (176°F) or more]

AK103743AG

EGR VACUUM REGULATOR
SOLENOID VALVE
<3.0L ENGINE – WITHOUT IMT>

AK102962

AC

EGR VACUUM REGULATOR
SOLENOID VALVE
<3.0L ENGINE – WITH IMT>

AKX01315

THROTTLE
BODY

EGR VALVE
<3.0L ENGINE>

AC

THROTTLE VALVE NORMAL VACUUM CONDITION

Open quickly

No vacuum (Remained as
barometric pressure).

THROTTLE VALVE NORMAL VACUUM CONDITION

Open quickly

Momentarily rises over 13 kPa (3.9
in Hg)

AKX01316 AB

EGR VALVE

TEE-
FITTING

BLACK

<2.4L ENGINE>

AKX01317AB

EGR VALVE

TEE-
FITTING

BLACK

<3.0L ENGINE>