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Once the abnormal situation occurs, then by setting out the specific cause of the malfunction analysis algorithm, and the trouble code stored in the memory lane system in the ECU, and start running the corresponding failure functions and the implementation of security measures modules (such as the fault indication light / malfunction warning tone / Auto stop the corresponding function), to remind the failure to go to repair shop car repair; and technical maintenance personnel can use the auto diagnostic equipment to read the fault code, accurate fault diagnosis and elimination of the problem.
(B) of the vehicle control protocol and diagnostic equipment used in the current national depot vehicle control protocol are the following: CAN / MOST / LIN / FlEXRAY? ISO/VPW/PWN/KWP2000? Other vehicles digital / analog control signal dedicatedMost of Taiwan’s new car and agreements with ISO protocol is used in old European car KWP Agreement, part of the agreement MOST BENZ cars, compare new / advanced Japanese / European vehicles are also used to CAN BUS protocol (VAG’s AUDI / VW B6, MAZDA 6, etc.), elm327 usb, and the next generation of stars agreement is FlexRay. CAN BUS protocol also often used to automate industrial control systems (such as temperature control / air conditioning control the elevator, etc.). Usually below the steering wheel and pedal board there would be a margin between the J1962 16PIN diagnostic socket (as shown in Figure III), so you can OBD2 connection cable (shown in figure II), to connect the socket 16 PIN J1962, read the ECU data. Current automotive computer diagnostic equipment can be divided into 2 types: 1. Universal handheld diagnostic equipment: only read / clear error codes, error codes will be displayed on the LCD PXXX string, the error code read out after going to turn manual control. Not many available features. PC version: Connect the computer to use, graphical display interface. For most of the agreements for vehicles ECU engine monitoring, data analysis and record dynamic data, read / clear error code. Including the VIN CODE reading, engine speed, vehicle speed, engine temperature, load, Air flow rate, O2 sensor, TPS and other relevant data. For vehicles and more. 2. The exclusive type of diagnostic equipment? In addition to the engine, the also includes ABS / instrument / gear / Airbag / comfort CODEING / SELF TEST / LOGIN. Most of these agreements are physical layer / data link layer of the Protocol, need to match the top of the agreements (such as SAE1979) for (c) Product Description This product is a universal OBD2 diagnostic equipment, support OBDII-ISO 9141-2 / ISO 14230 – 4 (KWP2000) / J1850 VPW/J1850 PWN / CAN ISO-15765-4 agreement, the use of the public version of ELM327 V1 decoder IC design, ELM327 help us deal with the underlying (Layer1/Layer2) and the upper layer (application layer) of the communication, so that the program developers to ignore the complex communication protocol, as long as the AT command to find compliance can be quickly applied to software development.
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