Toyota Corolla ABS sensor: icon is on, check brakes and ABS

I don’t name the city because of advertising and anti-advertising for the services of this city.

The abs light came on. Toyota abs errors. "Garage No. 6"

Thanks to this, there is a strong grip on the road and no skidding occurs. I took a risk, because in this condition - the ABS does not work, the speedometer does not work, the 4th speed does not turn on, in fact, I drove overdrive around the village for 3 months, no malfunctions were added.

I start the car, the ABS light comes on, if I drive a little and turn off the ignition, and then start it again...

And they said that the elimination would cost a sum. The ABC system is necessary to stabilize braking and improve wheel behavior on difficult road sections:

During emergency braking, slippage will not occur, which is why it is important to ensure that the anti-lock braking unit is in good working order. A couple of minutes after the start of driving, the “Engine” lamp also lights up. Although the electrical circuits were on the ABS of a Toyota Corolla Corolla in the same body as mine came on, but these were the circuit diagrams on the car.

The notification may light up for the following reasons: If the lamp does not light up constantly and flashes frequently, then the problem may be in the operation of the car’s generator.

It is best to check the operation of the Toyota Corolla ABS at a specialized car service center, where they can determine exactly what the problem is and fix it. If the car has an on-board computer, the technician will be able to read the error number and understand what is wrong. However, some manipulations can be done independently. It is recommended to start checking with fuses; if you don’t know how to disable ABS, but want to do it, it’s better to start with them too.

Without this element the device will not work.

You can find the fuse box under the hood: The control unit is also under the hood. You can find the control unit by the tubes coming from the brakes and wires. The control unit may receive mechanical damage, so you must first inspect it visually. You will first need to remove the electrical wire from it. Check if water has entered the unit: After washing, a similar problem may also occur, as moisture gets into the wiring.

ABS electronic module The anti-lock control unit is located next to the instrument panel.

What is ABS system

ABS stands for "Antilock-breaking System". In Russian it will sound like this: “Anti-lock braking system.” This standard was developed in 1936 by the German company Bosh. In the last century, it was installed on luxury cars at will.

Since 2004, the standard for locking and unlocking wheels during braking has been adopted by all car companies in Europe and around the world. Since then, every car, be it Toyota or Volkswagen, has ABS installed.

Attention! Anti - Blocking System helps increase the safety of the driver and passengers when braking when skidding on a slippery section of the road.

But car owners sometimes do not have a complete understanding of it. What kind of ABS system this is and how it works will be discussed in the next block.

What does the Toyota anti-lock wheel system consist of?

When answering the question “What is ABS?”, it is important to talk about the structural component of the system. The function of locking and unlocking wheels on Toyota cars is controlled by several mechanisms at once:

1. The brain of the system is the control unit. It receives signals from sensors, processes them and sends commands to the magnetic valves of the valve body. These actions are performed in milliseconds. In 1 second, the wheel manages to brake and start moving 15 times.
2. Hydraulic block. It is located between the brake calipers and the master cylinder. The hydraulic unit regulates the oil pressure in the hydraulic system, regardless of whether the driver presses the brake pedal or not.
3. Touch speed sensors. They count the number of wheel spins made. Send data to the control unit.
4. Braking mechanisms. They wait for commands from the brain of the system and act as they arrive.

Attention! A light with the letters ABS on the dashboard lights up when one of the mechanisms has failed.

The ABS system can be four-channel, three-channel, two-channel and single-channel. The number of channels depends on the valves that control the pressure in the hydraulic system. There is one channel for each wheel.

Modern Toyotas use four-channel ABS. Other types of anti-lock braking function are obsolete.

Self-diagnosis in the garage

The connector for diagnosing the engine is located near the battery or on the left, along the direction of the car. Often this is a plastic box with the inscription “diagnostics” in English.

The Toyota Corolla diagnostic instrument panel is located in the driver's cab. The indicator itself on the display can be in the form of an engine, a spiral or a “check” icon. It depends on the year of manufacture and brand of engine, the icon itself is not so important, what matters is the fault codes.

If the automatic transmission is faulty, this will be known using “Power”, “AT Check”, “OD”. Faults in other units will be displayed through their corresponding light diodes.

Socket No. 2 for diagnosing engine malfunctions is located in the cabin, at the bottom of the panel, and this facilitates trouble-free determination of malfunctions while the Toyota Corolla is in motion.

Working principle of ABS

ABS works according to the following principle:

1. A sensor device on the wheel hub informs the control unit about braking.
2. The release valve opens and the pressure decreases. The brake pads do not slow down the wheel and it continues to rotate.
3. This process is repeated several times per second. And the driver feels vibration in the brake pedal.

The system can also maintain pressure due to the operation of inlet and outlet solenoid valves and increase it.

But sometimes the function fails temporarily or permanently. The driver sees this on the dashboard monitor in the form of a flashing anti-lock braking system abbreviation.

Attention! This button may flash for a while when starting the Toyota, as the on-board computer reads information from all sensors. A few seconds after the start it goes out. If not, then you need to check Toyota for errors.

Diagnostic connectors Corolla 120, 150, 180

Error codes on the diagnostic connector DLC 2 of Corolla 120, 150, 180 are supplied in OBD II format. In OBD format, codes are encrypted with 5 characters: the first literal character and the next four numeric characters. The literal character of this code indicates the node where the problem occurred:

The following numbers indicate the exact location of the breakdown, as well as its classification.

Diagnosis of OBD II error codes is possible only with special scanners or by connecting connectors to a computer with special software. After receiving the Corolla codes, fault diagnosis is carried out using a table describing the error codes and their corresponding defects.

ABS errors on Toyota

To identify a malfunction when these three letters appear, you need to know Toyota error codes. To do this, you need to diagnose the car.

Toyota error codes include the following meanings:

• 11 – break in the solenoid valve relay;
• 12 – short circuit;
• 21 to 24 – short circuit in the solenoid of one of the car wheels;
• 31 – 34 – error in the signal from the speed sensor of one of the wheels;
• 41 – battery voltage is too low or too high;
• 51 – the valve body pump motor does not work;
• 52 – valve body pump motor is blocked.

It should be remembered that the codes on Toyotas of different models may differ from each other.

Modern scanners

Reading Corolla fault codes with scanners not only simplifies self-monitoring, but also makes it more informative. Today, manufacturers of diagnostic car scanners supply the market with a wide range of them, differing both in functionality and price. On the one hand, such a market is capable of satisfying the needs of various segments of consumers, but on the other hand, it creates certain difficulties, since it requires some special knowledge when purchasing. Here we will only indicate the main types of diagnostic equipment, as well as its purpose. And this will not be a bad guideline for choosing the right scanner. Based on functionality, scanners are distinguished between dealer, brand and multi-brand.

Dealer scanners are produced by automakers or their contractors, usually for a specific car brand. They have a wide range of functionality and are intended for professional use, and the price can reach several thousand dollars.

The group of brand scanners is also intended for professional use. They have functionality similar to that of the dealer, but more modest. The price of branded scanners ranges from several hundred to a thousand dollars.

Multi-brand scanners are most widespread among motorists. They are easy to use and provide sufficient information for most situations. Scanners of this group are unified for several car brands. Therefore, when purchasing, you need to check their ability to read Corolla error codes.

How to identify a malfunction and fix it

To determine the malfunction, the driver needs to diagnose the vehicle. The car owner can do the procedure independently. The process of searching for Toyota diagnostic codes is carried out as follows for connector DLC1:

1. Open the hood and find the connector. It usually says "Diagnostic".
2. Turn the ignition key to the on position.
3. Insert a jumper between pins TC and E1.
4. Remove the closing device from contacts WA and WB.
5. After 4 seconds, count the number of flashes of the ABS signal.
6. After this, remove the jumper from the codes described in point No. 3 and insert it back between contacts WA and WB.

The car owner will be able to determine Toyota diagnostic codes in the DLC3 connector as follows:

1. Repeat steps in point No. 1.
2. Before turning on the ignition, insert a jumper between contacts TC and TG.
3. Count how many times the ABS abbreviation flashes on the car’s dashboard monitor.
4. Set the jumper to the reverse position.

After counting the number of times the light blinked, you must refer to the instructions for an explanation of a particular error.

Trouble-shooting

First of all, you need to check the serviceability of the fuses. Inspect all connections and contacts for wear and poor contact. Make sure that there are no mechanical damage on the sensors: dents from impacts or chips.

If the problem is in the sensor, then you need to do the following:

1. Measure resistance and voltage with a tester or oscilloscope.
2. If the resistance is less than 800 Ohms, then a short circuit has occurred. At more than 1200 Ohm - break.
3. The sensor can be replaced at the service center.

It happens that the problem with ABS lies in the incorrect selection of tires. Therefore they must be the same size.

If the diagnostic codes correspond to numbers 51, 52, 11, 12 and others described in the section above, then you need to contact Toyota technical service.

Table. ABS and EBD system fault codes.