Emission Control Systems: Description and Operation

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.

Some engines are equipped with an exhaust gas recirculation (EGR) system. The function of the EGR system is to reduce the emission of nitrogen oxide (NOx).

Emission System Vacuum Harness:

PCV Valve:

Exhaust Gas Recirculation (EGR) System:

EGR Valve And Cooler:

The engine emission control consists of the following components:
- EGR valve
- vacuum regulator solenoid
- EGR tube
- emission control vacuum harness
- EGR cooler (6.0L diesel)
- differential pressure feedback EGR sensor

The 5.4L engine is equipped with a positive crankcase ventilation (PCV) system. The function of the PCV system is to circulate blow-by gases from the engine crankcase to the engine intake.

The PCV system consists of:
- PCV valve
- ventilation hose

For further description and operation, refer to Computers and Control Systems.