Vacuum Amplifier: Description and Operation

Fig. 7 Exhaust Gas Recirculation System:

Fig. 8 EGR System Operating Condition Chart:

The EGR system recirculates the exhaust gas into the intake manifold in correct amounts according to driving conditions and engine coolant temperatures, Fig. 7. Doing this retards the combustion, resulting in reduced amounts of nitrogen oxides (NOx) emissions.

Refer to Fig. 8 for EGR system operating conditions.