Chevrolet Equinox Engine Sensors & Switches

The engine management system of a modern vehicle uses several electrical and electronic components like sensors, relays, and actuators that work together for the proper functioning of a car’s engine. These sensors and components are a vital source of information for the Engine Control Unit, which then acts accordingly to give the optimal output from the engine. These sensors act as a bridge between the engine and other car systems so that all components work in coordination to achieve maximum output. There are many sensors that directly or indirectly affect the operation of an engine.

Before any diagnosis, one must know what is the function of each sensor and its location. Oxygen Sensor - The Oxygen Sensor or O2 Sensor is located in the exhaust system, near the exhaust manifold, after the catalytic converter. It is used to measure the oxygen content present in the exhaust gas released from the engine after the combustion process. Here the content of oxygen is measured to determine whether the engine is running rich or lean. This helps to increase and decrease the fuel supply accordingly and provides better fuel economy and performance. Engine Speed Sensor - The Engine Speed Sensor is used to measure the crankshaft rotational speed in RPMs. Also known as Hall Effect Sensor, it contains a serrated disk and a magnetic coil. When the crank spins, the current and magnetic field flows through the coil. These fields are disrupted by the disk, and the RPMs are recorded by a tachometer. Mass Air Flow (MAF) Sensor - The MAF Sensor is used to monitor the air entering the engine as it passes through the air filters. The density and volume data are then used by the drivetrain computer to determine the fuel metering and delivery. If the MAF sensor goes faulty, it may cause rich or lean engine conditions leading to rough idling and poor performance. Fuel Temperature Sensor - It measures the temperature of the fuel entering the engine to determine its density and to see if the fuel is at an optimal temperature for 100% combustion. If the fuel is too warm, the injectors will deliver more fuel to the engine, and if the fuel is cold, the injector will supply less fuel as a cold fuel can cause emissions, unburnt fuel conditions, and more. Early signs of the faulty sensor include increased fuel consumption. Manifold Absolute Pressure (MAP) Sensor - The MAP Sensor is used to measure the vacuum pressure in the intake manifold. This helps the Engine Control Unit to map out the spark advance and manage the fuel delivery system.

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