TIAGO

1.05L REVOTORQ ENGINE 80 Components : A. Electronic Control Unit : The EGR system of the vehicle is con- trolled by the Engine EMS ECU. Block Diagram : The EMS ECU controls the EVRV which in turns controls the EGR by applying vacuum or releasing it as per the signal from the EMS ECU. B. EGR Valve : The EGR valve is a diaphragm valve that is actuated by vacuum from the Vacuum pump through EVRV. The valve is mounted on the inlet manifold. It has three connections, one for the vac- uum, and one for the exhaust gas inlet from the exhaust manifold and one for the exhaust gas outlet to the inlet manifold. The valve opens to allow the Exhaust gas to re-circulate to the intake manifold. C. EVRV (Electronic VacuumRegulating Valve) The EVRV is an electro pneumatic so- lenoid switch, which is controlled more precisely by the EMS ECU based on the Engine speed, Coolant Temperature and Accelerator pedal position etc. EVRV provides variable vacuum levels to drive the EGR.