1. What is the car OBD2 Diagnostic \ Scanner Tools?
Applied disciplines: Electronic technology, communication technology
Application areas: Automobile detection, control module communication identification
Scope: Automobile fault diagnosis and fault decoding
1.1 Definition
Automobile electronic control system fault diagnostic instrument is also called automobile fault computer diagnostic instrument, or simply diagnostic instrument;
Automobile fault diagnostic instrument is a device used to interact with the automobile ECU and convert the information into a language and format that is convenient for people to view. The automobile fault computer diagnostic instrument communicates with the automobile self-diagnosis system according to the communication protocol followed by the automobile self-diagnosis system, obtains the data parameters related to the automobile in the automobile self-diagnosis system and analyzes them. This article is limited to discussing this kind of equipment that interacts with the diagnostic interface OBD (usually 16 pins) output by the vehicle ECU.
1.2 The hardware of automobile fault diagnosis instrument usually consists of three parts:
1.2.1 Input device provides a channel for users to input information and commands, and conveys functional requirements to the diagnosis instrument, such as: buttons, touch screens, knobs, etc., one or more combinations of methods. Some devices also have expansion input interfaces such as USB, microphones, cameras, etc. that are directly required for non-diagnostic functions.
1.2.2 Output device usually consists of two parts: & The display interface presents the real-time communication information and status of the ECU for users to read and read, usually a display screen or indicator light; the first two functions may also be completed on the same device, such as the touch screen can provide function option input and information output display. & The execution function part can complete the information interaction between the diagnosis instrument and the vehicle, such as: diagnostic module, diagnostic connection line (or wireless transmission such as Bluetooth), etc. to convey the information sent by the diagnosis instrument to the ECU and receive the information fed back by the ECU.
1.2.3 Computing device parses and converts the instructions sent by the user and the feedback information received from the ECU into the same format and compares them, that is, the core components of the device such as the CPU.
2. Understand the common brands and models of automobile fault diagnostic instruments:
Autel, Launch, BOSCH, RedBox, Sysokean, ADS, Xhorse, OBDSTAR, XTool
3. The main functions of automobile fault diagnostic instruments:
Introduction to the functions of automobile diagnostic instruments Automobile diagnostic instruments include but are not limited to some or all of the following functions:
Read fault codes
Clear fault codes
Read engine dynamic data streams
Read basic vehicle information
Action test, also called actuator test;
Matching, setting and encoding functions
Online programming function
OBD monitoring function
Others
4. Example application of automobile fault diagnostic instruments:
Use Yuanzheng X431 fault diagnostic instrument to reset the maintenance light of 19 FAW-Volkswagen Bora. Actual test model: FAW-Volkswagen Bora Legend Vehicle VIN code: LFV2A1153K*****.
Fault phenomenon: The maintenance light on the dashboard is on. Solution: Reset the maintenance light. Equipment model: X-431PADIII. Software version: FAW-Volkswagen V28.62.
Operation guide: Starting conditions: Maintenance completed, turn on the switch, do not start the engine, and the battery voltage is above 12V
1. Plug in the diagnostic connector, turn on X-431, select traditional diagnosis, and select Volkswagen
2. Select special functions
3. Select reset the maintenance light
4. Select oil reset (minor maintenance)
5. The engine of this car does not have T, select 7500KM180 days (without T)
6. The prompt is reset successfully. If the instrument is still on, perform ESI reset.
7. Reset the motor ESI, click reset.
8. Reset successfully, the instrument light goes out. Function operation is successful.
