EGR System: Operation

When the EGR valve is held open, some of the exhaust gas is led from the exhaust manifold to the EGR tube. The exhaust gas is then regulated by the EGR valve, and introduced into the intake manifold. The signal from the ECCS control unit is sent to the EGR control solenoid valve, which cuts the vacuum line for the EGR control valve when engine is starting, throttle valve switch is on, engine coolant temperature is low or high, engine speed is low or high, or during deceleration.