Somebody may find that his Audi A62.8’s ABS light warning all the time.
So We check for it and find that it true that it is same as the user said.After testing the car , the ABS system malfunction, the four wheels from locking in emergency braking. The observed four-wheel brake drag India quite,we can confirm the four-wheel braking force is balanced,so it is little likely that the hydraulic system leaks.
Link failing analysis equipment Sixth is v. The. G1552 AB MUSCLES program screening as well as discovered which 2 from the which means associated with failing for that AB MUSCLES pump motor provide voltage failing, the best back steering wheel pace sensor open up or even brief signal about the cathode problem signal. The actual ideas from the problem signal, We chose to know what the actual actuator overall performance, and then the utilization of analysis gear for that analysis from the procedure from the actuator. Throughout hydraulic pump motor overall performance check, the actual AB MUSCLES hydraulic pump motor V39 isn’t motion, your pedal vibration feeling. Based on this particular trend, the writer evaluates 3 types of feasible leads to: hydraulic pump motor V39 is actually broken, the actual exchange issue, or even hydraulic manage device harm. We additionally completed additional aspects of the actual check, four-wheel braking pressure within the screening procedure is actually minor, as well as all of us rapidly missed.
Next I prepare to read some date to find something useful, then entered the data flow of the ABS system.and we lift the vehicle and turning the wheel by our hands,then observe the 001 sets of data, the results of diagnostic equipment have shown that the right rear wheel speed is zero, it seems that the wheel speed signal is not the ABS control unit Which led to the likelihood of this phenomenon are generally three: no signal, not the signal lines or control cell damage. so we carried out the detection of the following steps.
1. To detect the right rear wheel speed signal.
Using the Oscilloscope directly measured on the right rear wheel speed sensors, resulting in signal voltage amplitude increased with the speed increases, the frequency response is good.
2. To detect of left rear wheel speed signal.
The same way to detect it ,and the frequency response is good too. ABS system’s control unit does not store the left rear wheel sensor failure, we adjust the gap of the left rear wheel sensor first, but the waveform is still the same situation.
3. Then we set the left rear wheel speed sensor connected to the signal line of the right rear wheel, to use the diagnostic equipment to read data.
After connecting, the results of equipment shows the right rear wheel speed is zero. It appears to be the internal problems of signal lines or control unit. To this end, we decided to detect the related wiring harness. After testing, the right rear signal line terminal 15 power supply pin, the battery 30 power supply pin and ground pin are normal. Based on the above measurement results, I determine the hydraulic pump the V39 relays or hydraulic control unit, but further demolition of the inspection.
Bosch ABS pump prices nearly million, so I decided to be overhauled, and try to fix. So I opened the ABS hydraulic pump hydraulic control unit, relay burned, it was discovered, the board also damage. According to the observed failure phenomenon, I solder recovery circuit board so that the conduction and the use of an external relay to replace the damage to the built-in relay. After fault diagnostic apparatus for the operation of the actuator diagnosis, V39 back to work.
After I opened the ABS control unit, upon inspection, the internal pins are connected by very fine wires, attached to a ceramic chip. In the right rear wheel of the input pin is found, root fine wire circuit. To this end, I use the wire to welded well. After the use of diagnostic equipment to read data, the right rear signal back to normal, while the signal waveform differences would cease to exist.
Above all , the car ABS system failure has been resolved. However, due to the external structure of the ABS has already been destroyed, so we have to do the packaging work, to ensure sealing, vibration resistance.