How can I tell if there is a problem with ABS?

It's a big problem and you have to deal with it right away.

Method: 1. Disassemble the negative pole of the car battery for more than 30 seconds, if it disappears by itself, the original fault code has not been cleared. You can continue to use it with confidence.

2.If method 1 cannot be eliminated, it must be repaired at the 4S shop immediately, otherwise it is a very big safety hazard! Very dangerous!

Don't guess, if you have to go long distances, you'll have to go to a repair shop.

You don't know, but you'll have to go to a professional repair shop.

It could be a line issue.

Ha ha. It's basically caused by sensors.

The full name of ABS is "brake anti-lock braking system", so what is "locking", the early car, a foot brake to the end, the wheels of the car will be braked to the end, but the car is still moving forward due to inertia, what are the consequences, at this time the vehicle is not controlled by the driver, the tires are locked, of course, the direction is not effective, which is very dangerous.

The function of ABS is to prevent the occurrence of wheel locking, and the ABS system can simulate the effect of point braking, so as to provide sufficient braking strength to the vehicle at the same time, but also retain the function of effective steering, which is the role of ABS system He Chuntong. Its point brake frequency is much higher than that of people, so the effect will be much better than the artificial point brake effect.

Can ABS shorten the braking distance due to hail resistance? In fact, it can't, the physical limit of the car itself is so much, no electronic system can violate the laws of physics, and it may even increase the braking distance, because since it is a point brake, it is impossible to maintain 100% braking strength all the time. In the actual driving process, sacrificing a little braking distance so that the car can retain the steering function and effectively avoid obstacles in an emergency, this practical significance will be greater.

ABS, is the anti-lock braking system, ABS, on the smooth road, or on the ice and snow road, will be through the sensor, sense the speed state of the four wheels, and intermittently release the braking force, to a certain extent to ensure the smooth operation of the model, to prevent side skidding, the effect is still quite large.

If there is no ABS, first of all, we must have enough driving experience at the same time, pay attention to ice and snow and smooth roads, in an emergency, do not step on the brakes, according to the situation light brake, the so-called Bi Min "point brake" is an artificial simulation of ABS, but compared to the real ABS, the natural effect is greatly reduced, and in an emergency, can be so calm braking, it is basically driving Gao Sun Yu hand, so I personally recommend ABS, as a novice is a must, such as the hand Kai Zhiguo veteran, Depending on your personal situation, ABS is not expensive.

The ABS warning light is on intermittently and turns off when accelerating.

Possible causes: When using a variety of vehicle electrical appliances, and the battery voltage drops below, while the engine speed rises, the voltage rises, and the ABS indicator lights off.

The system power supply** voltage of ABS is too low, such as insufficient contact of the wire head or poor tie-up.

How to deal with it: check and check the specific gravity of the battery; Check the charging system; Check the power supply** (e.g. voltage relay or power supply poor contact) The charging system voltage is lower, and the ABS system is turned off, so the ABS indicator light is on. After the engine starts, the ABS or ABS ASR warning light remains on until the engine IG FF is turned off.

Possible causes: ABS or ABS ASR hydraulic valve body tie iron line poor contact; ABS or ABS ASR hydraulic valve body wire joint contact is poor; ABS or ABS ASR computer malfunction.

How to deal with it: loosen the iron fixing screws of the hydraulic valve body, and then tighten the fixing screws to clean the contact surface of the banquet if necessary;

Check that the plug has become wider; Replace an ABS or ABS ASR computer.

The ABS warning light is lit up at high speed.

Possible reasons: In high-speed driving, the ABS computer calculates the speed signal of the vehicle and the speed of the rear wheels is too different from the speed of the front wheels; It is possible that the tire specification is incorrect or the rim specification is incorrect.

How to deal with it: refer to the tire specifications and steel rim specifications of the vehicle, and refer to the iron next to the fuel tank cap.

The ABS warning light is intermittently on.

Possible causes: Improper adjustment of the brake light switch; Poor internal contact of the brake light.

How to deal with it: Start the engine, step on the brake pedal, push the connecting rod of Duan You's brake switch down to the end with your fingers, and then relax the brake pedal to complete the self-set position. Replace the brake light switch.

After disassembling the rear brake cylinder, the brake pedal action stroke is too low.

Possible causes: The brake cylinder is reversed.

How to deal with it: Because the left and right rear vehicle sub-cylinders, the left and right installation causes the brake exhaust air nozzle to be under the sub-cylinder, so the air in the brake oil pipe cannot be discharged.

1. The sensing of the wheel speed sensor is dirty, loose or damaged.

2. The ABS computer plug is loose, the connection line is loose or the computer is damaged.

3. The ABS pump is damaged, or the solenoid valve is damaged.

4. ABS fault light is lit, brake warning light is lit.

Visual Inspection: Check that the car's parking brake is fully released. Check whether the liquid level of the brake reservoir is in accordance with the regulations.

Inspect all brake lines for signs of damage, deformation and leakage. Check whether all the fuses of the ABS system are in good condition, whether the wires are broken, and whether the sockets are firm. Check whether the battery capacity and voltage meet the regulations, and whether the connection of the positive and negative wires is reliable.

Check whether the ABS and ECI i connectors are securely connected. Check whether the circuit connection is corroded, damaged, loose or poorly contacted, and whether the wire of the ABS system is reliable. Check that the tires meet the requirements.

Check whether the wheels of the car are blocked and whether the hub bearing clearance is normal. The above inspection is normal or adjusted to be normal after entering the test inspection. Test Check:

Through the road test, the braking performance of the car and the operation of the ABS are evaluated, and the fault symptoms are confirmed. The test test inspection method is to first decelerate and brake at a speed of about 30 km h to stop the vehicle, and then brake urgently at a speed of about 40 km h to observe the phenomenon that occurs during the braking process. Judge the fault according to the fault indicator:

Under normal circumstances, when the ignition switch is placed in the "on" position to start the engine, both lights should be on, and after the start, the brake indicator should be extinguished immediately, and the ABS fault indicator should be lit for about 4s and then extinguished. Both lights should be kept off during the test run and during parking. If either indicator light is on, attention should be paid to the conditions that cause the indicator light to turn on.

If the ABS fault indicator of the car is lit, it indicates that the ABS is faulty; If the brake indicator turns bright, it indicates a malfunction in the conventional braking system, such as a fluid level that is too low. Fault judgment based on brake tire marks: If there are drag marks on the road surface during the test drive emergency braking, it means that the ABS system has a wheel locking fault.

According to the directional stability of the car during braking: 1. Deceleration and braking during the test run, the car is driving in a straight line, and there is deviation or even side slip during emergency braking, indicating that the ABS system is faulty; If the test is decelerated and braking, there is a deviation phenomenon, which is mostly a conventional braking system failure. Fault judging by the feel of the brake pedal:

After the engine starts, press the brake pedal, and the brake pedal has ** phenomenon, indicating that ABS is working, and its pedal ** is caused by the fluid of the reservoir being pumped to the brake master cylinder when the ABS oil pump is running; During the test, when the brake pedal is pressed, a slight vibration phenomenon is felt, indicating that the ABS is working, and the pedal vibration is due to the ABS working, the oil pressure of the braking system wheel cylinder is caused by the cycle process of decompression and decompression, pressure retention and pressurization, when the test run, the brake pedal of the car is pressed, if the continuous vibration of the brake pedal is not felt, it means that the ABS has failed.

Common in: ABS wheel speed sensor failure, wheel speed trigger bearing degaussing, ABS pump internal power failure, ABS and ECU communication failure. If the ABS system fails, a warning light will be displayed at the meter.

(1) The wheels are easy to lock.

Fault phenomenon: The wheels of the car equipped with ABS are easy to lock during emergency braking.

Cause of failure: ECU power supply circuit failure; The battery voltage is less than 12V; Faulty brake warning light switch or line; speed sensor and solenoid control valve wire harness damage, tie-off; Solenoid control valve failure.

2) The brake warning indicator is on wrong.

Fault phenomenon: let go of the parking brake or the braking warning indicator light is on.

Cause of failure: The brake fluid in the brake fluid tank is lower than the minimum scale within the specified range; Solenoid control valve failure. ECU power supply circuit failure; ECU failure; sensor failure; Parking brake switch, brake fluid level switch, brake warning light circuit fault.

Exclude. (3) Poor braking or abnormal ABS control operation Fault phenomenon: The braking system of the automobile equipped with ABS has poor braking performance, or the ABS control operation is abnormal, and the wheel anti-lock function cannot be completed normally.

Cause of failure: the wheel tire specification is wrong, the tire pressure is abnormal; The battery voltage is too low; Failure of the vehicle speed sensor; Leaks in brake lines or fittings; Faulty brake warning light switch or switch circuit.

No brakes or brakes are easy to lock.

ABS is a very mature technology and generally does not fail. The reason why the ABS fault light is on is often a few simple problems:

1. The sensing part of the ABS vehicle speed sensor is covered by other pollution sources such as soil and mud, which affects the sensor to sense the corresponding vehicle speed signal, so that the ABS computer cannot judge the vehicle speed, cannot determine the slip rate of the wheel, and then cannot issue the corresponding action command to adjust the braking. At this time, as long as you clean the dirt on the speed sensor and adjust the gap between the speed sensor and the signal gear ring, it can return to normal. However, some repair companies often ask the owner to replace the speed sensor, and it is better for the owner not to agree immediately.

Of course, the damage of the speed sensor is also the most common cause of the ABS lamp housing, and it must be replaced.

2. The system fails due to the poor signal caused by the loose connection between the system lines and the poor contact of the ABS relay. The most common is that the speed sensor cable is loosely plugged and causes failure, which will also show that the speed sensor signal is bad in the fault memory in the ABS computer. However, this does not mean that the speed sensor is broken, and experienced service technicians will generally check these simple areas before replacing the sensor.

Clean the probe regularly, and there is a fuse box on the right side of the dashboard, and there is a fuse that is ABS, just remove it and reinstall it!

The ABS fault light of the car instrument is lit, and this reason is the most common.

If the abs is faulty, you can replace it.

1. Problems with ABS wheel speed sensor

The wheel speed sensor is arranged on the wheel, it is easy to be polluted by mud and mud, and the sensor is covered with a large amount of soil, which will affect the transmission of the speed signal, and the ABS computer can not judge the speed signal, it will alarm, at this time, clean the dirt on the sensor, and adjust the gap between the sensor and the signal gear ring. If the wheel speed sensor is damaged, it can only be replaced.

2. ABS line connection failure

This is also a more common fault, although each car has an ABS system, but due to different processes, assembly quality and materials are actually different. There are many faults where the wheel speed sensor is loosely plugged in, and it can be checked by focusing on socks. The inspection of the line is a very troublesome thing, so you must be patient when dealing with it, and it is best to check the plug in each town, including the contact of the relevant fuse and the iron of the wire.

3. Problems with ABS control unit (ECU) programming

It is likely that the data within the control unit does not match or the data is incorrect, and the data is readjusted. This requires the use of a dedicated inspection computer. Problems with the ABS master cylinder, the ABS control unit (ECU) circuit board is faulty, and the computer needs to be replaced.

However, the probability of this failure is very small, and some cars and even the circuit board of the ABS control unit can still be repaired simply, such as the falling off of the soldering joint.

4. The motor of the electric return pump is damaged or the wiring is faulty

Inspect the electric return pump motor and its wiring. Disassemble the upper cover of the brake pressure regulator, unplug the electric return pump relay, turn on the ignition switch, and short the two terminals of the relay socket on the relay socket to connect the relay switch contact with a wire, so that the battery power supply is directly applied to the motor, at this time, the sound of the electric return pump motor turning should be heard, otherwise the motor or its line is faulty, and the circuit should be repaired or the brake pressure regulator should be replaced.

5. The relay of the electric night pump is damaged or the line is faulty

6. Detect the relay of the electric return pump and its circuit, and replace it if the relay is faulty; If there is a fault in the power supply line of the relay or the control line connected to the ECU, it should be repaired.