![]() ![]() The engine coolant temperature sensor measures whether the engine is warmed up or cool. The mass air flow sensor measures the amount of air flowing into the engine through the throttle plate. The throttle position sensor tells the ECU how far the throttle plate is opened when the accelerator ( gas pedal) is pressed down. Oxygen sensors tell the ECU whether the engine is running rich (too much fuel or too little oxygen) or running lean (too much oxygen or too little fuel) as compared to ideal conditions (known as stoichiometric). The ECU determines the amount of fuel to inject based on a number of sensor readings. Most modern engines use some type of fuel injection to deliver fuel to the cylinders.
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