ENGINE 134 1. EGR Valve 2. Valve lift sensor 1 2 3 4 1 2 1. To EGR Valve 2. From ECU 3. From Vacuum pump 4. EGR Modulator SYSTEM COMPONENTS EGR Valve (Progressive type) : The EGR valve is a diaphragm valve that is actuated by vacuum from the Vacuum Pump. The valve is mounted on the inlet manifold. It has three connections, one for the vacuum, one for the exhaust gas inlet from the exhaust manifold and one for the exhaust gas outlet to the inlet manifold. The exhaust gas starts flowing into the inlet manifold once the vacuum is fed into the valve. EGR Valve Lift Sensor: This sensor is mounted on the EGR Valve which gives EGR valve Lift information to the Electronic Control Unit (ECU). EGR Modulator: The EGR-Modulator is an electro pneumatic solenoid switch ,which is controlled more precisely by the ECU based on the Engine speed ,Coolant Temperature and Accelerator pedal position. NOTE : Care should be taken to connect the ports of the EGR-Modulator to their respective hoses. Any interchanging of the connections will lead to malfunctioning of the EGR system.
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