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This video explains the ECU circuit board and demonstrates how the crankshaft and cam signal simulation is used to run the ECU and perform the various tests.
The engine ECU controls the injection of fuel into the engine and the timing of the spark to ignite it. It determines the position of rotation using a crankshaft position sensor, so that the injectors and ignition system are activated at exactly the right time. It also uses a number of sensors to read the status of the engine so that the engine can perform optimally.
The input to the ECU includes the following sensors:
Crankshaft position sensor
Cam position sensor
Knock sensor
Coolant temperature sensor
Manifold absolute pressure or MAP sensor
Mass air flow or MAF sensor
Oxygen/O2/Lambda sensor
Fuel pressure sensor
Engine speed sensor
Throttle position sensor
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