Advanced Automotive Fault Diagnosis
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LÔØI NOÙI ÑAÀU, ledklok
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- 1.3.3 General terminology
| 1.3 Terminology
1.3.1 Introduction The terminology included in the following tables is provided to ensure that we are talking the same language. These tables are provided just as a simple reference source. 1.3.2 Diagnostic terminology Symptom The effect of a fault noticed by the driver, user or technician Fault The root cause of a symptom/problem Diagnostics The process of tracing a fault by means of its symptoms, applying knowledge and analysing test results Knowledge The understanding of a system that is required to diagnose faults Logical A step by step method used to ensure nothing procedure is missed Report A standard format for the presentation of results 1.3.3 General terminology System A collection of components that carry out a function Efficiency This is a simple measure of any system. It can be scientific for example if the power out of a system is less then the power put in, its percentage efficiency can be determined (P out /P in ⫻ 100%). This could, for example, be given as 80%. In a less scientific example, a vehicle using more fuel than normal is said to be inefficient Noise Emanation of sound from a system that is either simply unwanted or is not the normal sound that should be produced Active Any system that is in operation all the time (steering for example) Passive A system that waits for an event before it is activated (an air bag is a good example) Short circuit An electrical conductor is touching something that it should not be (usually another con- ductor or the chassis) Open circuit A circuit that is broken (a switched off switch is an open circuit) High In relation to electricity, this is part of a resistance circuit that has become more difficult for the electricity to get through. In a mechanical system a partially blocked pipe would have a resistance to the flow of fluid Worn This word works better with further additions such as: worn to excess, worn out of toler- ance, or even, worn, but still within tolerance! 2 Advanced automotive fault diagnosis Quote To make an estimate of or give exact informa- tion on the price of a part or service. A quota- tion may often be considered to be legally binding Estimate A statement of the expected cost of a certain job (e.g. a service or repairs) An estimate is normally a best guess and is not legally binding Dodgy, Words often used to describe a system or knackered or component, but they mean nothing! Get used @#%&*! to describing things so that misunderstandings are eliminated tải về 7.07 Mb. Chia sẻ với bạn bè của bạn:
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