a. Engine Speed Sensor
b. Oxygen Sensor
c. Coolant Temperature Sensor
d. Air Pressure and Atmospheric Temperature Sensors
a. Engine Speed Sensor: Practically, your engine’s speed sensor is placed near to the crankshaft. It senses the engine speed by tracking the crankshaft position. Then, it sends signals to your car’s electronic control module about the tuning of the crankshaft. You may find any one of the following type of engine speed sensor in your car:
i. Magnetic Sensor
ii. Hall Effect Sensor
b. Oxygen Sensor: You may think that as it is about oxygen sensor, it is located in the air intake system. No, you are wrong. Practically, it is placed in the exhaust pipe or in the exhaust manifold. Its main function is to sense the amount of oxygen gas in the exhaust gas. Actually, it determines the voltage requirement of the spark plug for combustion. It sends the signal directly to the ECM for taking further action.
c. Coolant Temperature Sensor: It is also an important sensor for your vehicle. It continuously reports about the temperature of coolant. Actually, this type of sensor is a thermistor. It sends the signal directly to the ECM as a varying voltage signal. If the coolant temperature of your engine is very high, then this sensor sends signal to your ECM to supply charge with low fuel percentage.
d. Air Pressure and Atmospheric Temperature Sensors: It is also very important to control the density of air for proper combustion. Air pressure and temperature are vital factors to affect the density of air. At high pressure, the air becomes highly dense. However, at high temperature the air is lither enough. Thus, air pressure and temperature sensors send signals to the ECM to control the air flow accordingly. That is how your engine takes air from atmosphere according to requirements.
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