Engine Emission Control

Engine Emission Control

CAUTION: Do not remove any part of the engine emission control system. Operating the engine without the engine emission control system will reduce fuel economy and engine ventilation. This will weaken engine performance and shorten engine life.

The engine emission control consists of the:
^ Exhaust Gas Recirculation (EGR) system.

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Typical Vehicle Emission Control Information (VECI) Decal

The Vehicle Emission Control Information (VECI) decal shows:
^ the components of the emission control system.
^ the correct vacuum hose routing.

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EGR System Components
The EGR system returns a portion of the exhaust gas to the intake manifold to reduce the combustion temperature. This results in lower nitrous oxide formation.

The Powertrain Control Module (PCM) controls the EGR vacuum regulator solenoid. The EGR vacuum regulator solenoid controls the vacuum to the EGR valve. When the EGR valve opens, exhaust gas flows to the intake manifold. The EGR transducer measures the flow through the EGR valve to the exhaust manifold tube and sends a signal to the powertrain control module.

The EGR system module to exhaust manifold tube:
^ connects the exhaust manifold to the EGR valve.

The EGR system module transducer:
^ monitors the EGR system module flow rate through the EGR to exhaust manifold tube.
^ sends an EGR system module flow rate signal to the powertrain control module.

The EGR vacuum regulator solenoid uses input from the powertrain control module to change the EGR system module operation.