DIY Honda Accord abs block repair

In detail: DIY Honda Accord abs block repair from a real master for the site my.housecope.com.

It was: periodically the lamp of malfunction of ABS, electric power steering was switched on.

After renovation: everything functions flawlessly.

In general, ABS control units have had a number of features before. Firstly, they used to represent 2, and sometimes 3 different parts, which were divided into a valve body with solenoid valves, an electronic ABS control unit and, if there was, then also a separate control unit for directional stability. Moreover, the control units themselves had the most common printed circuit board, connectors, etc.

In this combination, the ABS systems had a number of external problems, such as sensor defects, wire breaks and short circuits. There were problems with connectors and connectors, bad contacts. There were flaws in the printed circuit boards themselves and the elements. Moreover, the printed circuit boards themselves were quite easily repairable, the components were affordable.

After some time, the manufacturers of ABS blocks decided to change the manufacturing technology of the boards for ABS blocks. The goal was to increase the reliability of the system by getting rid of unnecessary connectors and wires. Namely, the electronic part of the system (the control unit itself) and a set of valves with a pump were decided to be placed in one housing. Due to the lack of the possibility at that time of some custom-made elements that needed to fit in one tiny place, it was decided to immediately order a board in the form of a hybrid circuit on a ceramic substrate. Inside the block, such a circuit was a ceramic pad with deposited resistors and soldered capacitors. The microcircuits themselves were unpackaged there, which made it possible to save space. And to the ceramic board, a connection was made with small gold-plated or silver-plated wires.

Video (click to play).

This method had several advantages. Firstly, it turned out to achieve what the manufacturer wanted - to get rid of unnecessary wires. Secondly, it was possible to place as many as 2 control units with power cascades on an area of ​​3x4 centimeters. It was both the ABS unit and the ESP unit. Everything turned out very well, even nothing. If only it were not for another problem - the system has become very sensitive to temperature changes and vibrations. The first thing we got was the detached conductors from the hybrid board itself. Although there weren't really that many problems.

However, the ability to manufacture PCBs with more than 2 layers and the availability of custom ICs with a high sampling rate allowed the transition to the 3rd generation of ABS units, where a regular PCB was again used. Only in this case everything was housed in one enclosure of the ABS unit. We managed to get rid of the defects of the hybrid circuit, but nevertheless, some problems remained.

Even Japanese electronics manufacturers have stepped on this rake. Europeans did not lag behind them. A defective printed circuit board here leads to the inoperability of the system. To fix it, you first need to get to the board itself. The block is "trepanned", excellent access is obtained. After repairing the board defect, the unit is sealed. You can operate the car without worrying about problems with ABS and stability control.

However, there was a defect with the block on our Honda Accord, which is not typical for ABS blocks of modern European manufacturers. There was a non-contact of the conductors connecting the printed circuit board with a group of external connectors, which led to a periodic system failure. The conductors have been replaced with MGTF stranded wires, everything has been tested and works perfectly.

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