ARIA

ENGINE 150 2.1.8.2.2 SYSTEM COMPONENTS A. ELECTRONIC CONTROL UNIT The EGR system of the vehicle is controlled by the Engine EMS ECU. For more details refer EMS Section in this group. BLOCK DIAGRAM The EMS ECU controls the vacuum solenoid valve which in turn controls the integrated EGR cooler by- pass. The vacuum solenoid valve controls the By- pass actuator by applying vacuum or releasing it as per the signal from the EMS ECU. ASSEMBLY EGR COOLER MODULE WITH EGR VALVE AND BY PASS VALVE Assembly EGR cooler module consists of the • EGR cooler • EGR valve • Bypass valve The EGR cooler assembly is provided with inbuilt electronic EGR and a by pass valve. The EGR Cooler is a heat exchanger that is used to cool the exhaust gases before they are recirculated to the intake manifold. The hot exhaust gases are routed into the EGR cooler from the exhaust pipes through the EGR valve. In the EGR cooler, the ex- haust gases are made to pass through metal tubes that are surrounded by engine coolant. The cooled exhaust gas is more effective to help to reduce the pollutants. The EGR valve is electrically operated by the EMS. There is an EGR Cooler bypass valve, which is con- trolled through the EMS using an electro-pneumatic valve.