EGR Backpressure Transducer: Description and Operation

EGR Vacuum Modulator Inspection

PURPOSE
The Exhaust Gas Recirculation (EGR) Vacuum Modulator controls the amount of vacuum applied to the EGR Valve regulating the amount of exhaust gases that are allowed into the intake manifold.

OPERATION
The EGR Vacuum Modulator senses engine load by measuring backpressure in the exhaust system. The Modulator then sends a regulated vacuum signal to the EGR Valve which opens the valve a specific amount controlling the amount of exhaust gases that are allowed into the intake manifold.