Car Repair World

Computer Operating Guide  in Your Car Did you know that modern cars can have over 80 different computers scattered around the car? These control everything from your automatic windows to your stereo to the brake system to your engine. The computers are all hidden behind body panels, in the engine compartment, and dozens of other places. In fact, the only sign of computers most drivers will ever see is the console interface. Emissions Standards:  The Birth of Car Microprocessors Car computers really got their start with the introduction of the catalytic convertor and electronic fuel injector. Before these systems, the fuel/air ratio was controlled by the carburetor, which could be more than a little imprecise. A catalytic convertor requires a precise fuel/air ratio (1:14.7) in order to be effective in eliminating emissions. As emission standards got more and more strict, more control was needed. Enter the first car microprocessors. The chips were nowhe...

Computer PCM/ECM/BCM Working Of Vehicles Computer System Powertrain control module / Engine control module / Body control module Helpful Information Communication standards were established in the OBD2 operating system development. These communication standards used a CAN (controller area network) system which can achieve communication speeds of more than 500 Kbps. Advantages of using information buses for communication is that if a fault occurs with any of the process modules, it can be reported separately to a diagnostic tool. Wiring is simplified by a technique known as multiplexing, a kind of wiring system which is assigned for each module. Sensor circuits operate on a 5 volt reference which drive system monitoring and control. This article explains how an automotive computer PCM (powertrain control module) works. A car computer or powertrain control module (PCM) is a designated computer that was developed to manage the engine and driveline components. This ...