Exhaust Gas Recirculation (EGR) System Module (ESM)
The ESM is an integrated differential pressure feedback EGR (DPFE) system. It functions in the same manner as the conventional DPFE system, however the various system components have been integrated into a single component called the ESM. The flange of the valve portion of the ESM bolts directly to the intake manifold with a metal gasket that forms the measuring orifice. This arrangement increases system reliability, response time, and system precision. By relocating the EGR orifice from the exhaust to the intake side of the EGR valve, the downstream pressure signal measures manifold absolute pressure (MAP). The system provides the powertrain control module (PCM) with a differential DPFE signal, identical to a traditional DPFE system.