by Larry Johnson
31. January 2017 08:00
On-board diagnostics (OBD) is an automotive term referring to a vehicle's self-diagnostic and reporting capability. OBD systems give the vehicle owner or repair technician access to the status of the various vehicle subsystems On-Board Diagnostic systems are in most vehicles today. In the 1980's manufacturers started using electronics to control engine functions and diagnose problems. This was to meet EPA emission. Over the years on-board diagnostic systems have become more and more sophisticated. OBD-II, a new standard introduced in the mid-'90s, there was almost complete engine control and monitors the chassis, body , accessory devices, and the diagnostic control network of the car.
. The amount of diagnostic information available thru OBD-II has varied widely since its introduction this software is built into all cars made after 1996, and it is included in many earlier cars as well. The latest technology is called OBD-II, which stands for on board diagnostic system. The OBD-II is incredibly useful to mechanics and other people curious about the status of their vehicle when something seems to go wrong. The OBD-II system in your vehicle has sensors and ports in various parts of the car. There is one underneath the dash of most cars, and many vehicles also have a port under to the driver's seat. There are other sensors and activation centers spread throughout the vehicle in order to monitor the activity of various parts of the car. Essentially, the software is located all throughout the vehicle.
Today's automobiles are so complicated that it might seem like any kind of repair requires a degree in electrical engineering. Our cars are electronically complex, but built-in diagnostics come as part of the deal. There are more than 3000 generic fault codes, in addition to manufacturer-specific codes. Not all of them point to a clear solution. The oscilloscope helps us find the problem. What purposes have oscilloscopes in automotive diagnostics? Between missing data perimeters in data and inconclusive diagnostic codes the oscilloscope is an irreplaceable tool. Often the problem hasn’t recorded an error code (DTC) in the corresponding ECU, a DTC that can be read with a code reader. Usually a DTC is recorded when there is a broken cable or a cable has short circuited to a positive or negative supply. But when a detector or a mechanism has stopped working in some mid position, there is no error recorded. In this case, as when you need to find the reason that caused an error to be recorded – the automobile oscilloscope is the most needed instrument. With the increase of sensors, actuators and wiring diagrams built in the modern automobiles, the automobile oscilloscope is an instrument which diagnoses irregularities in the automobile., when you have to observe output signals from inductive sensors, whose output signals form an impulse sequence, slow-changing analog signals, primary and secondary ignition circuits, intake manifold absolute pressure, starter current waveforms, charging currents and etc. One characteristic of a great automotive technician is the ability to perform efficient and effective diagnostics. These techs seem to know what they need to know and the tools and tests to get it. Of course, this is partly due to an accumulation of meaningful experience—experience based on real understanding. One of the skills that distinguish inexpert is a knack for finding the relevant details of his diagnostic experiences and making the “connections” and “putting the pieces together.” These abilities are what lead to an in-depth understanding of automotive systems and to “meaningful experience.”
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