Engine Sensors used by ECU to Control

Engine Sensors

Engine Sensors provide the correct amount of fuel, the engine control unit (ECU) monitors a variety of different sensors, so you can get the right burst of fuel at the right moment.

Here are just a few of these sensors and how they work with the ECU:

  • Mass airflow sensor – Senses the mass of air entering the engine
  • Oxygen sensor(s) – Monitors the levels of oxygen in the exhaust
  • Throttle position sensor – Detects the throttle valve position and how much air goes into the engine, which affects the fuel rate
  • Coolant temperature sensor – Provides info so the ECU knows when the engine has warmed to operating temperature
  • Manifold absolute pressure sensor – Senses the air pressure in the intake manifold
  • More air means more power for combustion – The more air that goes into the engine, the lower the manifold pressure, so this reading is used to gauge how much power is being produced
  • Voltage sensor – Monitors the system voltage in the car
  • Engine speed sensor – Monitors engine speed, used to calculate the pulse width

There are two types of multi-port systems:

  • the fuel injectors can all open at the same time — or each one can open just before the intake valves do (this is called sequential multi-port fuel injection). If the driver makes a sudden change, the sequential system responds faster because it only has to wait only until the next intake valve opens, and not the next complete revolution of the engine.

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