#ECU DIAGNOSTICS FULL#

Too little fuel - too much oxygen makes the combustion slow and weak.Д®ngines used to have this mixture quantity and ratio controlled by an entirely mechanical metering device called a carburetor, which was little more than a collection of fixed diameter holes (jets) through which the engine вЂsuckedвЂ™ the fuel. Too much fuel - too little oxygen, and the combustion is dirty and wasteful. Not only is the amount of mixture important, but the ratio of that mixture has to be correct.

#ECU DIAGNOSTICS FULL#

Too much mixture and the engine will be full throttle, too little and the engine will not be able to power itself or the car. This combination of air and fuel is called a вЂmixtureвЂ™. As the air is sucked in, enough fuel has to be provided to create power to sustain the engineвЂ™s operation while having a useful amount left over to propel the car when required. While this sounds like something that can be done mechanically (and was in the past), thereвЂ™s now a bit more to it than that.ДЄn internal combustion engine is essentially a big air pump that powers itself using fuel. It determines the position of the engineвЂ™s internals using a Crankshaft Position Sensor so that the injectors and ignition system are activated at precisely the correct time. If this unit controls both an engine and a transmission, it is often described as a Powertrain Control Module (PCM).ДЇor the purposes of this article, we will discuss the ECU as an Engine Control Unit.ДЇundamentally, the engine ECU controls the injection of the fuel and, in petrol engines, the timing of the spark to ignite it. In the Automotive industry, the term ECU often refers to an Engine Control Unit (ECU), or an Engine Control Module (ECM). The use of the term ECU may be used to refer to an Engine Control Unit, however ECU also refers to an Electronic Control Unit, which is a component of any automotive mechatronic system, not just for the control of an engine.

Ecu diagnostics