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.

EGR System Components:

The engine emission control consists of the:
- exhaust gas recirculation (EGR) system module.

The vehicle emission control information (VECI) decal shows:
- the components of the emission control system.
- the correct vacuum hose routing.

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 system module. When the EGR valve opens, exhaust gas flows to the intake manifold. The differential pressure feedback sensor measures the flow through the EGR valve from the exhaust manifold tube and sends a signal to the PCM. A metering orifice in the EGR valve-to-exhaust manifold tube restricts the flow rate when the EGR valve is open.