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Automobile fault detector can not only detect and diagnose fuel injection system (EFI) faults, but also detect and diagnose various electronic control systems such as anti-lock braking system (ABS), safety air bag system (SRS), automatic transmission system (ECT) failure. Fault tester models are different, and the methods of use are also different. Therefore, when using a fault tester, you must operate in accordance with the instructions of different testers.

4. Fault self-diagnosis test method

After connecting self-diagnostic test tools such as fault detectors, coders or jumper wires to the diagnostic socket on the car, turn on the ignition switch to trigger the self-diagnostic system to perform self-diagnostic tests. When the fault detector is used for self-diagnosis test, its display screen can directly display the fault content and cause. The use methods of various fault detectors are different. The following is an example of using V.A.G1551 and V.A.G1552 fault testers commonly used in domestic automobiles to test the multi-point injection system of Volkswagen cars to illustrate the process of self-diagnostic testing using fault testers.

There are 10 optional functions for tester V.A.G1551 or V.A.G1552, see Table 9-1. The Chinese version of the tester can be read directly, and it is very convenient to use and operate. The maintenance personnel call it a "dumb machine". In order to make it easier for readers to master the usage methods of different versions of the tester, the English version of the tester with translation is explained below.

chapter summary

This chapter mainly introduces the composition and function of the automobile fault self-diagnosis system, fault self-diagnosis detection principle, self-diagnosis test method, test content, test tools and test methods, fault diagnosis and troubleshooting methods of the electronic control system, etc. The key points are as follows:

1. Composition and function of automobile fault self-diagnosis system. One is to issue an alarm signal; the other is to store fault codes; the third is to enable the backup function to make the control system run in an emergency state.

2. Fault self-diagnosis and monitoring principles, test methods, test content, test tools and test methods of automotive electronic control systems. Self-diagnostic test content includes reading and clearing fault codes, data flow analysis, monitoring actuators and programming matching, etc.

3. Troubleshooting procedures and methods for engine electronic control system fault diagnosis. Common fault symptom simulation test methods include vibration test method, heating test method and water shower test method.

Section 4 Fault Diagnosis and Elimination of Automotive Electronic Control System

The diagnosis and troubleshooting methods of various automotive electronic control system faults are similar. The following uses the engine electronic control system as an example to illustrate the diagnostic procedures and troubleshooting methods of automotive electronic control system faults.

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