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The reason why the ABS fault light is always on. What is the fault when the ABS light is on? Can the car still drive?

12-24

灯常亮有些车主不以为然,因为有时候车辆并没有出任何异常情况,感觉刹车系统还能正常工作 ,所以有些车主不了了之,其实这是不正确的。 The ABS fault light is always on. Some car owners disagree, because sometimes the car does not have any abnormal conditions, and it feels that the brake system can still work normally , so some car owners leave it alone. In fact, this is incorrect.

。 The ABS light is on, indicating that the ABS system is faulty, and the ABS system will stop working. The common point is that your car is the same as the car without the ABS system. The braking effect of the car will be worse (the braking distance will increase, When the ABS light is on, the fault should be removed in time.


The role of ABS anti-lock braking system
性能,提升车辆紧急制动时的安全系数。 The ABS system can improve the safety performance of the vehicle and the safety factor of the vehicle during emergency braking. 抱死,车辆行驶方向无法操作,如果后轮抱死。 When the vehicle brakes suddenly, it is easy for the wheels to lock. After the lock, the friction between the wheels and the ground decreases. If the front wheels are locked, the direction of the vehicle cannot be operated, and if the rear wheels are locked. It is extremely prone to slippage. The function of ABS is to continuously adjust the pressure of the brake cylinder to prevent the wheels from locking up.

ABS is a necessary auxiliary system to ensure that our vehicles can stop smoothly and safely during emergency braking. ABS can prevent tires from slipping during braking. http://claricelispector.com/


ABS is mainly composed of hydraulic brake system, ABS control unit and wheel speed sensor. If the ABS light is on, the tire anti-lock system may be malfunctioning.


The reason why the ABS fault light is on
Each component of the ABS anti-lock braking system is relatively simple and clear, so it is relatively simple to analyze the cause of the ABS fault light on.
1. Problems with ABS wheel speed sensor.
信号,就会报警,此时清洁传感器上的脏污, 调整传感器与信号齿圈的间隙即可。 The wheel speed sensor is placed on the wheel and is easily polluted by mud and mud. The sensor is covered with a large amount of soil, which will affect the transmission of the speed signal. The ABS computer cannot determine the speed signal and will alarm. Just adjust the gap between the sensor and the signal ring gear. If the wheel speed sensor is damaged, it can only be replaced.
的。 2. Line connection failure This is also a relatively common failure. Although each car has an ABS system, the assembly quality and materials are actually different due to different processes. There are many failures of the wheel speed sensor plug-in, which can be checked. It is very troublesome to check the wiring, so be patient when handling it, it is best to check every plug, including the contact of the relevant fuse and the condition of the iron wire. http://claricelispector.com/
3. The problem of ABS control unit (ECU) programming is most likely that the data in the control unit does not match or the data is incorrect. Re-adjust the data. This item requires a dedicated test computer.
4. The problem of ABS master cylinder.
5. The ABS control unit (ECU) circuit board is faulty and the computer needs to be replaced. But this kind of failure probability is very small, some cars and even the circuit board of the ABS control unit can still be easily repaired, such as the loss of solder joints. http://claricelispector.com/

The cause of the ABS fault light is always on. Now let ’s look at the diagram to understand the detailed troubleshooting method of the ABS fault light. I believe that if you encounter the ABS fault light, it can be easily resolved.

Illustration of the reason why the ABS light is always on
1. The battery voltage is too low or the fuse is blown;

2. The wire of ABS system is broken, the plug is loose or the relay is not firmly connected;


3. Defective wheel speed sensor;


4. Defective hydraulic adjustment device;


5. Defective electronic control device.

Hydraulic adjusting device and electronic control device are the core components of ABS system. Such components are generally more precise and will not be easily damaged. As a car that has only traveled 10,000 kilometers, it usually does not fail, but it must start with a regular inspection.

1. First check if the battery voltage is 12V;
2. Check if the ABS fuse is normal;
3. Check the ABS system wires for any disconnection;
4. Check whether each plug connector is firmly connected;
5. Check whether the relay is fixed firmly;
6. Check if the wheel speed sensor is normal.
Remove the speed sensors of the four wheels and check whether there is dirt on the sensor head. If there is dirt, wipe the dirt on the sensor head and reinstall it, and check if the ABS warning light is normal.

The wheel speed sensor consists of an electromagnetic induction sensor head and a magnetic ring gear. The ring gear is mounted on the wheel hub and rotates with the wheel. When the ring gear rotates, the tooth tips and backlash alternately face the sensor head. When the tooth tip is opposite the sensor head, the gap between the two is the smallest, and the magnetic field around the sensor's induction coil is the strongest;

When the backlash is opposite to the sensor, the gap between the two is the largest, and the magnetic field around the induction coil is the weakest. The magnetic flux alternates, and the induction coil generates an alternating voltage whose frequency changes in proportion to the speed of the vehicle. The speed sensor can send the speed signal to the electronic control device in time to control the braking force of each wheel.
If the electromagnetic induction sensor head sucks iron filings, the gap between the sensor head and the ring gear will change, so that the magnetic flux will not change significantly, the alternating voltage generated by the induction coil will be irregular, and the electronic control device will not Effectively control the braking force of each vehicle and keep the ABS light on. http://claricelispector.com/
头部很容易吸附铁屑等脏物,当ABS灯亮时,要首先检查这一系统。 On vehicles with an ABS system, the wheel speed sensor head can easily adsorb dirt such as iron filings. When the ABS light is on, check this system first.


分析】ABS灯常亮一般分以下三种情况: [In- depth analysis] The ABS light is always on in the following three situations:
First, turn on the ignition switch, the ABS fault light is always on.
In general, the following three situations will cause this failure of the ABS system:
1. When the vehicle speed exceeds 10km / h, no speed signal is transmitted to the ABS control unit.
2. When the vehicle speed is greater than 40km / h, the speed signal exceeds the tolerance value.
的断路或对正极、接地短路故障。 3. The sensor has an identifiable open circuit or short circuit to the positive pole and ground.
If you encounter the above situation, you should focus on the following items:
1. Circuit connection between wheel speed sensor and ABS control unit.
2. The installation clearance, installation position of wheel speed sensor and ring gear, and the situation of contamination by dust or impurities.
3. Is the wheel bearing clearance too large?
4. The sensor itself is faulty.

Tip: When cleaning the vehicle, the engine compartment is often flushed with high-pressure water. The high-pressure water will splash into the connection points of the ABS control unit. Corrosion will cause an instant short circuit. 。 This is a soft fault, and the probability of the fault is very random. Generally, it is not easy to detect with a multimeter, and the cause of the fault can only be found when the fault occurs, the root cause can be found, the problem can be solved , and the fault is eliminated .


The ABS fault light is on during driving <br /> Generally, this situation will be caused by other faults, and all four wheels will be locked when braking suddenly, which means that the ABS system will not work at all.

If you encounter such a problem, you need to perform the following steps to diagnose and repair:
1. Confirm whether the ABS master cylinder and ABS electronic control module are damaged due to other vehicle failures.
2. Carefully check the wiring and plug to see if there are any virtual connections and breakages.
调取故障码。 3. Retrieve the fault code with the help of special computer detection equipment . http://claricelispector.com/

Soft fault codes can no longer be displayed after being cleared by the instrument. Failures that are not cleared need to be repaired to determine whether they can be repaired.


ABS sometimes works, sometimes it doesn't.
Another ABS fault is that the ABS warning light is always on, and the 20km / h brake will lock up. There are three reasons for this failure:
1. The ECU is malfunctioning.
。 2. Mechanical failure .

3. The wheel speed sensor is faulty.

MK type ABS belongs to four-wheel independent control. Its working principle is to send signals to the ECU through the wheel speed sensor, and the ECU instructs the hydraulic regulator to control the work of the braking system.
For such hidden faults, ABS sometimes works, sometimes it doesn't work. First, check whether the ECU works normally, then check whether the mechanical part is normal, and then check whether the wheel speed sensor is normal.

Check the appearance first. If there is any debris, remove the sensor for cleaning. When re-installing, there should be a clearance of about 0.05 between the iron core of the wheel speed sensor and the wheel bearing. Then turn the left rear wheel and use the digital multimeter millivolt gear Measure the output voltage of the sensor and confirm that it is within the standard range.


产生尽可能大的制动力而又不会抱死,提高汽车制动能力,改善车辆操纵性和稳定性。 The ABS system is to make full use of the adhesion coefficient between the tire and the ground, so that each brake can produce as large a braking force as possible without locking, improve the braking ability of the car, and improve the maneuverability and stability of the vehicle. If you encounter a fault, you must first understand the environment in which the vehicle is often driven and whether other faults encountered are related to ABS faults, and then make corresponding repairs.

Can the ABS fault light still drive the car?
If the ABS fault light is on, the owner can try whether there are any abnormalities in other aspects of the car (braking, driving, steering). If there is no problem, it is most likely a circuit problem with the ABS.
That is, then the circuit has failed (many aspects such as ECU, etc.)
In fact, even if ABS has been working, it will not have much impact. But in view of safety, it is recommended to go to a 4S shop or a professional repair point

If your car's ABS light is on during driving, gently press the brake pedal to park the car in a safe place. 发动机 ,行驶几分钟后检查警告灯是否熄灭,如果行驶过程中警告灯熄灭,说明没有问题。 Then restart the engine and check whether the warning light goes out after driving for a few minutes. If the warning light goes out during driving, there is no problem. The ABS system can effectively prevent the wheels from being locked during braking, so it ensures the stability of direction and handling, and also provides the best braking force.
http://claricelispector.com/
If the warning light does not go out, the ABS system is not working properly, but in this case, the standard hydraulic braking system is still working, which will not affect the user's vehicle. In this case, please promptly go to the nearest car service station for maintenance.


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After the car is tested, it is normal for the abs fault light to turn on. This is because when testing exhaust emissions, the front-wheel drive vehicle only has the front wheels rotating, and the rear-wheel drive vehicle has only the rear wheels rotating.

条评论 3 comments

  • look forward to

    Looking forward to commenting on [2019-06-04 12:16:17] reply

    My car also has the ABS light on for several days, and it has not disappeared. Some friends said that it would not affect driving, and some friends said that it must be changed. It was checked with a computer instrument that the right rear wheel sensor had failed. May I ask, is it a big impact?

    • Car Repair Network

      Auto Repair Network commented on [2019-06-04 17:58:31] Reply

      @Looking: check the ABS braking system to see if it is normal, if normal, the impact is not great, it is best to go to the maintenance factory to check, and check the fault code

  • Aunt

    Aunt commented on [2018-12-26 10:19:58] Reply

    very good, thanks

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