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Message: <blockquote data-quote="Iintercooler" data-source="post: 16970172" data-attributes="member: 512218"> Read these past threads for the better understanding 4 stroke Engines - <a href="http://www.elakiri.com/forum/showthread.php?t=1626956" target="_blank">http://www.elakiri.com/forum/showthread.php?t=1626956</a> Fuel injection - <a href="http://www.elakiri.com/forum/showthread.php?t=1627122" target="_blank">http://www.elakiri.com/forum/showthread.php?t=1627122</a> This is one of a fuel injection system what I have talked about in ‘fuel injection’ thread This is called Electronics Fuel Injection (EFI) This is consist of these main components,        ECU (Electronic controlling unite)     MAP (manifold absolute pressure)     O_2 Sensor     BPW (base pulse width)         IDC (injector duty cycle)         IAC (idle air control)         CAN (controller area network)         TCU (transmission control unit) <img src="http://[CENTER][url]http://repairguide.autozone.com/znetrgs/repair_guide_content/en_us/images/0900c152/80/07/ca/3a/large/0900c1528007ca3a.gif[/url][/CENTER]" alt="" class="fr-fic fr-dii fr-draggable " style="" />    Fuel injector is controlled by an ECU (Electronic controlling unite)MAP (manifold absolute pressure) sensor measures the amount of vacuum pressure inside of running engine and then it tells ECU how much load is on the engine (how hard the engine is working)The information picking by the sensor is important because the two pieces of data that ECU need to work properly with rpm and loadAnother valuable sensor in the EFI system is the oxygen O_2 sensorWhat the O_2 sensor does is measures the air/fuel mixture in the exhaust system and corrects any errors Base pulse width (BPW) is the amount of time that injector is opened by the ECU in one engine cycle Once the ECU is calculated everything, then BPW is the end result how much fuel is actually put into the engineIf the ECU sees it means to increase fuel, it does so by increasing pulse width and if it needs to decrease fuel, it decreases the pulse widthThere is a term related to BPW called IDC (injector duty cycle)IDC is the ratio of BPW compared to the total time of an engine cycleIDC measures and indicates how much of an injectors capacity is being used in an engineIf an injector is at full capacity it's a sure sign that the injector is too small another important EFI term is IAC (idle air control)IAC is an electronic valve that regulates the control vacuum leek That controlled leek allows for great idle speed control and can maintain consistent idle speed under different loads It also can raise or lower idle speed we needed Some EFI systems are equipped with a CAN (controller area network) The Controller Area Network (CAN) acts as a gateway in that it allows the devices to communicate a large amount of information over a simple high-speed two wire network Since it provides data from all sensors, it eliminates most of the extra wiring necessary on vehicles not equipped with CANOne of the primary components that users CAN is the TCU (transmission control unit)The TCU is similar to the ECU and that is a computer but the TCU only varies with the transmission behaviorThings like vehicle speed, shift points, shift firmness, down shifting and port converter lockup are some variables handled by the TCU Hope this video better explain what EFI[YOUTUBE]<a href="http://www.youtube.com/watch?v=ZlqCaG5TDsQ" target="_blank">http://www.youtube.com/watch?v=ZlqCaG5TDsQ</a>[/YOUTUBE]<a href="http://www.youtube.com/watch?v=ZlqCaG5TDsQ" target="_blank">youtube link: http://www.youtube.com/watch?v=ZlqCaG5TDsQ</a>Visit home for more on Automobile:http: //www.elakiri.com/forum/showthread.php?t=1626999Please correct me, comment your suggestions and add more detailsThank you for your time.I don't expect reputation or a bump please read and get something unless it will be wast of my time. </blockquote>

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