It is collective that every system of almost current car and lorry has a bit: It is namely by computer pilot. Used the system of simple switch, relay or bedspring contact in the past, operate by a series of diode, dynatron and logistic circuit now. Vacuum controls an operating system to be replaced by electronic servo, simple switch circuit is received as a child the signal that black box hair will come to take first step. To operate and control these complex systems, the computer needs an input: Door of solar terms of rate of the minutely rotate speed of engine, car opens degree, engine bear. From where does the computer get inputting signal? The answer is: Sensor. Today's car is having complex sensor net, adopt the circuit that sensor comprises and system, the each part that runs a system from the car gets information, pass to the computer with information of velocity of light. Sensor tells the computer the car how to much speed is, how much is the minutely rotate speed of engine, engine bear has how old, the car is turning or wait a moment all right continuously. When all sensor job is regular, car can go weller, discharge cleaner also, efficiency is taller also (with the past any moment photographs are compared) . But, with other equipment, sensor also can damage. When it damages, the computer loses its forward position information, it cannot get the information that holds significant action place to need. Must finding out which sensor right now is bad, repair or change it, let a system return normal working status. Air flow transducer calls air flowmeter again, its action is to detect the volume that engine takes tolerance, the mark of telecommunication of join translate into that will pass circuit into tolerance information inputs ECU, in order to offer quantity of ECU affirmatory fuel injection and ignition time. The entering that air flow transducer obtains tolerance signal is ECU has fuel injection pilot main basis, be like occurrence breakdown of its attaint or its circuit join, can make be measured of engine into tolerance not accurate, too thick or the mixture gas of intromit cylinder is too rare, bring about ECU to cannot have accurate control to fuel injection quantity thereby, cause engine movement is abnormal, discharge exceed bid.
The case that should bring to everybody today follows air flowmeter to matter, entered store recently car of a China peaceful
, car advocate reflective car takes a taxi very hard sometimes, the car is worn the engine after the car idle fast shake serious, maintenance master worker receives car vehicle taxi need to stepping on clutch to just can take a taxi, master worker of the maintenance when taking a taxi discovers clutch needs to walk a few times to perhaps walk after all to just can make a car forcibly more, the installation on the clutch pedal pad of this car has clutch position sensor, insufficient delicacy is caused after sensor time is long it is difficult to take a taxi the breakdown that catch fire. The idle after additionally the car is being hit fast shake, maintenance master worker is taken detect computer undertakes detecting discovering signal of flow of newspaper breakdown air is low to engine system.
Maintenance master worker considers as air flowmeter to dirt compares dirty need to clean, maintenance master worker tears open next air flowmeter observation to discover air flowmeter is very clean, maintenance master worker installs good air flowmeter
, hitting car to prepare to search then have flat appearance, the result is hitting the engine after the car to shake no longer, maintain a master to realize those who cause to line outlet empty receives air flowmeter at this moment, engine of outlet of wiring harness of rock of hold together master shakes shaking to shake no longer again, maintenance master worker unplugs next outlet,
Observing the discovery that insert a needle is plug empty receives the trouble that cause really, maintenance master worker that two special forceps handle needle of wiring harness tea had secured wiring harness outlet again engine of rock wiring harness shakes trouble removal,
Maintenance master worker deletes malfunction code, car advocate drive the car.
