Application of wiring harness tester in automobile engine computer control wiring harness detection

Preface

With the increasing requirements for automobile performance and the extensive use of modern automobile electronic control systems, the use of wiring harnesses as carriers for automobile signal transmission is also increasing. At the same time, it is also the focus and difficulty of fault detection and diagnosis of automobile electronic control systems.

Automobile engine control system

The composition of the automobile engine control system is composed of sensors, control units and actuators. The signals of various sensors are input to the engine control unit, which is processed and calculated, and then outputs control signals to control the operation of related actuators to achieve control of the engine injection and ignition timing.

In the diagnosis and troubleshooting of engine electronic control system faults, whether reading signal waveform or measuring signal voltage, it is necessary to use the standby plug method to pierce the back of the plug. The disadvantage of this method is that it damages the protective film on the surface of the wiring harness, which is easy to cause moisture and impurities to mix in and accelerate the oxidation and damage of the wiring harness terminal.

To achieve the detection of no damage at the engine computer harness end, a device is needed to measure the terminal without affecting the normal operation of the engine electronic control system (the schematic diagram of the connection between the device and the engine computer harness is shown below). To achieve the above goals, the ATX-3000 harness tester from Antai Electronics can do it easily!

ATX-3000 Harness Tester Features:

There are up to 4096 test points, the channels can be expanded quickly and smoothly, and the test is efficient; it has powerful functions and can perform on-off, withstand voltage, insulation resistance, and two-wire resistance tests. It can efficiently and accurately eliminate unqualified products such as short circuits, open circuits, and miswiring. It can be said that it has all the functions of a single machine; intelligent self-learning data comparison and analysis, automatic recording of test reports, intelligent test software, large database, and intelligent MAX; high-voltage detection and automatic reset, safe and reliable testing 5-inch multi-point capacitive touch screen + win10 operating system, easy operation, full of technology.

Testing Process

The system can automatically generate samples through self-learning sample testing, and complete the full function detection of the wiring harness with one-click import. The detection process is as follows:

in conclusion

The wiring harness tester is connected to the actual vehicle, and the electrical signal of the tested wiring harness is the same as the result of the back-insertion method. There is no damage to the wiring harness, and the wiring harness tester has the following features.

(1) Without affecting the normal operation of the engine, it has a two-way connection function, one end is connected to the engine computer, and the other end is connected to the engine computer wiring harness;

(2) Measure electrical properties such as on/off sequence resistance on the lead-out measurement terminals. No damage to the wiring harness, reduce the damage to the wiring harness caused by the back-insertion method, and reduce maintenance costs;

(3) A wiring harness fault setting switch can be installed on the lead-out measuring terminal. By setting the open circuit, false connection, etc. between the engine computer and the wiring harness to simulate faults, it is convenient for on-site teaching of engine electronic control system fault diagnosis courses and saves teaching costs.