Normal Driving Modes

Engine idle, warm-up, acceleration, deceleration and wide open throttle modes are controlled based on all of the sensor inputs to the ECM. The ECM uses these sensor inputs to adjust fuel quantity and fuel injector timing. EGR valve control is performed using feedback from the oxygen sensor. An oxygen sensor is located in the exhaust manifold to sample oxygen content exiting the engine cylinders. The ECM uses the O2 sensor, along with other sensor inputs, to govern the amount of exhaust gas recirculation to reduce HC (Hydro Carbons) and CO (Carbon Monoxide). Engine coolant is routed through the base of the EGR valve to provide additional cooling of the exhaust gas, which further helps the reductions of emissions. The EGR valve has a self-cleaning function. When the engine is shut off, the EGR valve rotates twice to reduce carbon deposits at the valve seat.