Automakers strive to make their products as safe as possible for consumers. To do this, almost every vehicle gets a set of all new blocks of electronics and other automation. The presence of ABS in the design of the car is hardly possible to surprise anyone. However, with an increase in the number of nodes in the car, the probability of failure also increases. We have to learn how to repair the ABS unit.
Some drivers simply "fold back" contacts from this node, but this solution reduces the level of driving safety. This is especially important when driving in the off-season and on a slippery road.
- 1 The functioning of the electronics in the anti-lock system
- 2 Actions when the ABS indicator lights up
- 3 Self repair of sensors
- 4 Repair of electronics
- 5 Conclusion
The functioning of the electronics in the anti-lock system
The job of ABS is to provide straightforward movement of the machine in critical situations. Under heavy braking of the car, this unit does not allow to completely block the wheels. Thus, the vehicle does not skid. Often this function helps during maneuvers on slippery roads.
The anti-lock system includes the following components:
- several sensors located on the wheels;
- electronic control unit responsible for switching on / off individual elements;
- light indicator mounted on the dashboard by the automaker.
Electronics also monitors the health of the entire complex and the resulting defects during operation. When they occur, a light signal appears on the dashboard, notifying of the problem. After that, you will need to repair the ABS yourself or ask for help at the service station. The second option will be more expensive. Most often there they are offered to completely replace the unit, and not to bother with figuring out the exact place of an open circuit in a chain or a non-working element.
Actions when the ABS indicator lights up
When the driver turns the key in the ignition, the computer system diagnoses the performance of the main components through the sensor system. It is considered normal that the indicator with the word “ABS” lights up for about 3 seconds after cranking the key. Further, it should go out in order to confirm the health of the unit.See also: How to change the brake fluid in a car with and without ABS
When the attenuation does not occur or the light comes on while driving, it is necessary to perform the following actions:
- Vehicle is parked in the nearest permitted area.
- Using a multimeter, we diagnose the voltage on the battery, which should not be less than 10.5 V.
- We check visually and by disconnecting / connecting the contacts on the battery.
- Inspect the wires from the ABS sensors for integrity or breakage.
Diagnosis of ABS
If simple troubleshooting methods fail to identify the problem, then you will need to contact the station for more accurate computer diagnostics. The equipment will determine the error code, deciphering which will reveal the fault. Further, the defect will only eliminate. In this case, there are two ways: independently or with the help of the workers of the bus station.
Independent repair of sensors
Various reasons can cause the indicator light to come on. There are serious problems that cannot be ignored. And it happens that it is enough to clean off the dirt from the sensor, and we can assume that the repair of the ABS sensor with your own hands is almost complete. In any case, a visual assessment of the state of the sensor must be carried out.
This will require jacking the wheel. Next, unscrew the bolts and remove it from the hub. After that, turn the steering wheel in the opposite direction from the wheel being diagnosed. Unscrew the bolts that block access to the sensors.
Dirty ABS sensor
Clean rags clean the sensors from plaque. It is advisable not to use the aggressive "chemistry". You can moisten the cloth in a mild soap solution, and then remove moisture with a dry cloth. Repairs with sensors are usually not carried out, and if they have obvious mechanical defects or damage, then such parts must be replaced.
After cleaning, we return everything to the places in the reverse order of disassembly. Check the information from the indicator light on the dashboard. If the issue is resolved, the “ABS” will go out, and if it is not resolved, then it is necessary to identify problems in the electrical unit.See also: Diagnostics of the brake system of the car on the stand
Repair electronics unit
The main problem associated with the inoperability of the ABS electronic unit is the lack of contact between the elements. This can occur from mechanical (shaking or sharp vibrations), chemical (due to corrosion) or electrical problems (burned out by increasing voltage).
- Step 1. Removes the block
- Step 2. Using the knife open it.
- Step 3. Identify the failure
- Step 4. Solder the contacts
- Step 5. Check with a multimeter and wait for cooling
- Step 5. Hermetically close the case and put the block back
For repair, you will need to disconnect the problem node and take it to the workbench for easy repair. We open neatly housing with a construction knife. Usually for sealing part of the plastic case taped. We do not run the knife deeply so as not to damage the wiring or other elements.
We reveal the place of break or other malfunction. With the help of a pulse soldering solder the damaged wires. Also soldering station Weller is suitable for soldering. Ceramic base can not be overheated, otherwise all the work will lead to complete failure of the entire board. It will only throw it away.
We assemble the unit after repair. Then install it in its place and check the signal on the dashboard. If the indicator has ceased to light constantly, then this means that the problem has been solved.
When an ABS fault signal appears on the dashboard, it is worthwhile to quickly check its condition at least visually. If the mechanical cleaning of the sensors did not bring a positive result, then you will need to repair the ABS unit yourself or with the help of specialists. Tightening the repair is not worth it, because this system increases driving safety. It is allowed for some time to drive without ABS, but it is better to do it in dry weather, at low speed and on a good road.