The “ABS” icon on the instrument panel lights up: causes of the malfunction
A modern car is equipped with a large number of auxiliary electronic systems that increase driving safety.
Some solutions improve directional stability, others affect braking efficiency, etc. Moreover, in some countries it is prohibited by law to operate cars without ABS on public roads. Of course, if this system fails, the behavior of the car when braking changes greatly, and not for the better. The ABS icon also lights up on the dashboard, indicating that the problem needs to be repaired.
The main possible causes of malfunction of the Chevrolet Cruze ABS system
If the “ABS” icon on the dashboard lights up, it means that the anti-lock brake system is not working normally. The main reasons for the failure of the ABS system:
- malfunction of ABS sensors;
- break in the electrical wiring leading to the sensors;
- malfunction in the power supply circuits of the ABS unit;
- ABS control unit failure;
- CAN bus fault;
- vehicle speed sensor malfunction.
To more accurately determine the location of the ABS fault, computer diagnostics is required. In general, the anti-lock wheel system is a significant and complex vehicle system, so troubleshooting requires qualified diagnostics.
Anti-lock braking system ABS: structure and principle of operation of ABS on a car
So, before moving directly to the malfunctions, we note that the advantages of the ABS system are obvious - the car remains controllable during emergency braking, which allows you to avoid an obstacle, as well as avoid possible serious consequences.
In a nutshell, ABS is an anti-lock braking system that prevents the wheels from locking when braking. The driver feels the operation of the system by characteristic signs when the pressed brake pedal “cracks,” “vibrates,” or “shoots.” The fact is that when the brake is pressed firmly and constantly, a “pulse” locking and unlocking of the wheels occurs (several times per second).
If we compare braking with and without ABS, during emergency braking on a car without such a system, the control wheels will be blocked. This leads to the fact that by turning the steering wheel it will not be possible to change the trajectory of the car.
Having understood what ABS is, you should study what the system consists of. Although the device may differ slightly on different cars, the general design includes:
- wheel speed sensors;
- control valves in the hydraulic brake line
- a pump can also be integrated into the system;
- ABS electronic control unit;
It turns out that ABS (sometimes mistakenly called ABC) is a kind of pressure regulator in the brake line. When braking, information from sensors about a sharp deceleration of the wheel enters the unit, which begins to change the pressure in the brake lines, reducing the pressure and unlocking the wheel.
The unit polls the sensors several times per second, which manifests itself in the form of a “ratchet” on the brake pedal. Different systems have different numbers of sensors and valves (there are four-channel ABS, three-channel ABS, etc.). As a rule, modern cars today have solutions with four channels (1 channel for each wheel).
Opel Astra. Anti-lock brake system ESP MK60
content .. 190 191 192 193 194 195 196 197 198 199 ..Rice. 6.6. Schematic diagram of the MK60 anti-lock brake system
ESP is currently the most modern active control system and prevents critical driving situations from occurring at the very beginning. The ESP MK60 Astra-H anti-lock brake system contains the following systems:
— anti-lock braking system (anti-lock braking system);
— traction control (TCS);
— Electronic Stability Program (ESP).
and has the following main functions:
— understeer control logic (UCL);
— control of braking forces when cornering (CBC);
- Trailer Stability Program (TSP);
— Integral body control (ICC).
Versions of systems installed on Opel Astra cars
Engine
| Z14XEP; Z16XEP; Z17DTL | Z18XE; Z20LEL; Z17DTH | |
| Standard | ABSMK70 | ABSMK60ESP |
| Additionally | ABSMK60ESP | — |
| Expandable | TPMS/DDS | TPMS/DDS |
| NVA | NVA | |
| HSA | HSA |
Depending on the equipment version, the ESP MK60 anti-lock brake system may also have the following additional functions:
- The Pressure Drop Detection System (DDS) monitors the loss of tire pressure through the wheel speed sensors in the event of a Tire Pressure Monitoring System (TPMS/DDS) failure.
— hydraulic emergency brake booster (HBA);
- Hill Start Assist (HSA) prevents the vehicle from rolling backwards within two seconds, thus making starting on a slope easier.
The following table contains general information about the use of different versions of systems installed on Astra-H vehicles.
Service
In the ESP MK60/HSA anti-lock brake system, the control unit cannot be separated from the hydraulic modulator. The anti-lock brake control unit/hydraulic modulator must always be replaced as a single module.
Description of connectors - anti-lock brake system ESP MK60
Rice. 6.7. ABS control unit connector
The Anti-Lock Brake Control Module is connected to the power source through a 26-pin harness connector with the pinout shown below.
ABS control unit connector pinout
| Conclusion | Description | Signal type |
| 1 | Solenoid valves - battery + (pin 30) | I |
| 2 | Rear left wheel speed sensor - ground | 0 |
| 3 | Rear left wheel speed sensor - signal | I |
| 4 | Yaw Rate Sensor Power Supply | 0 |
| 5 | Front right wheel speed sensor - signal | I |
| 6 | Front right wheel speed sensor - ground | 0 |
| 7 | Brake light switch | I |
| 8 | Front left wheel speed sensor - ground | 0 |
| 9 | Front left wheel speed sensor - signal | I |
| 10 | Yaw rate sensor mass | 0 |
| 11 | Rear right wheel speed sensor - signal | I |
| 12 | Rear right wheel speed sensor - ground | 0 |
| 13 | Anti-lock brake system solenoid valves and control unit - ground (pin 31) | I |
| 14 | Return Pump - Battery Positive Voltage (Pin 30) | I |
| 15 | Output Signal - Rear Right Wheel Speed Sensor | 0 |
| 16 | Not assigned | — |
| 17 | Output Signal - Front Left Wheel Speed Sensor | 0 |
| 18 | Diagnostics | I/O |
| 19 | Private CAN high | I/O |
| 20 | Ignition (pin 15) | I |
| 21 | HS CAN low | I/O |
| 22 | Brake light switch | 1 |
| 23 | HS CAN high | I/O |
| 24 | Not assigned | — |
| 25 | Private CAN low | I/O |
| 26 | Return pump - ground (pin 31) | 1 |
Yaw Rate Sensor/Group
The yaw rate sensor is installed on the Astra-H together with the ABS ESP MK60 control system. This sensor calculates the vehicle's instantaneous yaw rate (angular velocity) and lateral acceleration. This data is required by the anti-lock braking system control unit to calculate the moment at which a critical driving situation begins.
Data exchange between the yaw rate sensor and the anti-lock braking system control unit is carried out via a special CAN bus (private CAN bus) in order to reduce the load on the HS bus. The private HS CAN bus operates in the same way as the “normal” HS CAN.
Rice. 6.8. Sensor connector location
yaw rate
Diagnostics of the yaw rate sensor
Rice. 6.9. Yaw rate sensor connector
Pin assignment
yaw rate sensor connector
| Conclusion | Description |
| 1 | CAN bus low |
| 2 | CAN bus high |
| 3 | Sensor power supply (+) |
| 4 | Not assigned |
| 5 | Sensor weight (-) |
| 6 | Not assigned |
The yaw rate sensor does not have its own diagnostic tool. It is controlled by the Anti-Lock Braking System Control Module, that is, the Anti-Lock Braking System Control Module receives information regarding all yaw rate sensor faults via the private HS CAN bus. The corresponding fault codes are stored in the anti-lock braking system control unit and the warning lamp turns on.
Anti-lock brake system ESP MK70
The MK70 anti-lock brake system is a simple anti-lock brake system with diagonal contours. This is a further development of the MK60 anti-lock brake system. The anti-lock braking system control unit/hydraulic modulator unit has been optimized in terms of weight and its overall dimensions have been reduced. Four active sensors installed on the vehicle's wheels provide the anti-lock braking system control unit with the necessary information about the wheel speed. If installed, the anti-lock brake control unit is associated with the hydraulic modulator and cannot be disconnected from the modulator; this requires removal of the hydraulic modulator/control unit assembly.
ATTENTION
The pump electric motor must not be disconnected from the hydraulic modulator.
Schematic diagram of the MK70 anti-lock brake system
Rice. 6.11. Block diagram of the MK70 anti-lock brake system
content .. 190 191 192 193 194 195 196 197 198 199 ..
ABS is on: why does the indicated indicator light up?
So, having figured out how ABS works, what it is and why the system is needed, let’s move on to its problems. First of all, problems will be indicated by a warning light located on the instrument panel.
Of course, as in the case of airbags and other solutions, individual control units, which are integrated into the overall electronic engine control system (ECM), interrogate the sensors after turning on the ignition (self-diagnosis). In this case, on some cars the ABS lights up for just a couple of seconds, after which it goes out, and this is the norm.
It is quite obvious that overall safety will depend on the operation of the anti-lock braking system, while the “ABS” indicator warns the driver that the ABS system is not working and is disabled, that is, during emergency braking, the wheels will lock when the brake is pressed hard.
In any case, a diagnosis is needed. If you remember the general structure of the system, then it becomes clear that the ABS light often comes on for one of the following reasons:
- The wheel rotation sensor has failed;
- There are problems with the ABS module;
- The contacts from the sensor to the unit are damaged, that is, communication is lost;
- There are problems with the crown on the hub;
In other words, the anti-lock braking system light on the instrument panel indicates that the ABS is faulty and is therefore deactivated. Moreover, even if the ABS lights up, this does not mean that there is something wrong with the braking system itself. The fact is that another indicator is responsible for the brakes (often a red exclamation mark on the instrument panel).
One way or another, drivers often note that the ABS sensor comes on while driving or the indicator lights up from the moment the engine starts. In this case, the problem can be constant and floating, when vibration on a rough road causes the ABS to light up and then go out.
We also note that although the system is quite reliable, occasionally the electronics themselves may fail. In this case, you need to do a reset. Sometimes it is enough to disconnect the battery terminal for 10-15 minutes, then connect it back and start the car. If there are no breakdowns and everything is in order, after a reset the system will work normally.
Why does the ABS error appear?
Normally, the ABS light comes on immediately after starting the engine and goes out after a couple of seconds, when the on-board computer checks (and approves) the operation of the system itself.
If the light comes on while the Renault is in motion, or does not go out shortly after starting the engine, the reason may be that:
- ABS system fuse blown
- The ABS wheel sensor has failed - due to mechanical damage or a change in the gap between the sensor and the gear rotor
- contact with the system sensors is lost - the wiring is broken, the terminals are oxidized
- the voltage in the on-board network has dropped below 10.5 V (the battery is dead, the generator is not working, etc.)
- The hydraulic pump motor has failed
- The hydraulic valve or ABS control unit has failed (rare failure).
Also, the ABS lamp may light up after an illiterate repair of your Renault due to the inept actions of a technician who damaged the sensor or wiring.
ABS lights up: what should the driver do?
Having studied the possible causes, let's move on to what to do if the ABS is on. As already mentioned, you can first try to reset the errors by removing the terminal from the battery.
If the driver finds himself in a situation where the ABS lights up while driving, but at the moment, for one reason or another, it is not possible to carry out computer diagnostics, you can try to activate the system as follows:
- accelerate the car on a flat road to 40 km/h;
- make sure that an emergency stop will not create problems for other drivers;
- sharply press the brake pedal and brake completely;
Process
| For Manual transmission or Easytronic :
For automatic transmission
If everything is done correctly, the “ECN” (error code number) message and error codes will be displayed at the mileage location. |
Let's sum it up
As you can see, the ABS system is not particularly complex in terms of design, but it performs important functions and directly affects safety. For this reason, it is recommended to carry out preventive diagnostics of ABS, as well as eliminate any failures and malfunctions of the system if the slightest sign of trouble occurs.
In any case, if the ABS light is on, it should be taken into account that the anti-lock braking system is disabled and sudden braking will lead to wheel locking. For this reason, it is important to avoid situations where emergency braking is required, and to detect and correct the malfunction as quickly as possible by actively applying the methods described above.
Why do the brakes on your car squeak, you can hear the brakes grinding, whistling or squeaking when braking: the main reasons. Brake pads squeak, what should the driver do?
The brake pedal is too tight, does not press down or has become soft, the brakes fail: main faults, diagnostics and troubleshooting methods.
How to brake correctly in a car with a manual transmission: types of standard braking on a manual transmission, emergency and emergency braking, tips.
The brake pedal is soft after replacing the brake pads: why are the brakes weak, is it necessary to bleed the brake system. What nuances should you pay attention to?
What is an automatic transmission brake band: the purpose of the element and its features. Signs that your brake band needs adjustment and how to adjust it.
The brake pedal falls to the floor, the brakes disappear unexpectedly, after replacing the brake fluid, pads, brake discs: the main causes of the malfunction.
Anti-lock brake system (abs) Opel Astra
All Opel Astra cars are equipped with an anti-lock braking system as standard. In addition, depending on the vehicle configuration, several more electronic braking control systems can be installed. All systems are closely interconnected and complement each other. This subsection describes in detail the anti-lock braking system installed on all vehicles. Warning. Attempts to independently interfere with the operation of electronic braking control systems will lead to failure of these systems. All maintenance and repair work on these systems must be carried out only at specialized service stations that have the necessary equipment and qualified personnel. Anti-lock brake system (ABS) prevents the brakes from locking up prematurely when braking while driving. The traction control system (TCS - Traction Control System) prevents the drive wheels from slipping when starting from a stop or intensive acceleration, for example, on a wet road. If wheel slip occurs, the TCS system forcibly reduces the engine's traction characteristics and, if necessary, applies the brakes to the slipping wheel. The anti-skid system (ESP), along with ABS, reduces the risk of uncontrolled skidding both when braking the car and when cornering. The ESP system operates in conjunction with the traction control system (TCS). The system constantly receives information about the steering angle and vehicle speed. If there is a danger of skidding, the car is stabilized on the selected trajectory by changing the traction characteristics of the engine and braking individual wheels. Warning. Electronic systems improve the handling and braking performance of a car, but do not replace the driver, since they cannot independently prevent incidents due to careless driving. Avoid making gross mistakes in driving by relying on assistance systems. Anti-lock braking system (ABS). The anti-lock brake system (ABS) consists of wheel speed sensors, a brake pedal switch, a hydroelectronic control module and a warning lamp in the instrument cluster. The anti-lock braking system is also equipped with a self-diagnosis system that detects malfunctions of system components. ABS serves to regulate the pressure in the brake mechanisms of all wheels when braking in difficult road conditions, preventing wheel locking. The ABS system provides the following advantages: – avoiding obstacles with a higher degree of safety, including during emergency braking; – reduction of braking distance during emergency braking while maintaining directional stability and controllability of the vehicle, including when turning. In the event of a system malfunction, diagnostic functions and maintenance of operation in the event of system failures are provided. The hydroelectronic control module receives information about vehicle speed, direction of travel and road conditions from wheel speed sensors, steering angle sensor, and throttle position sensor. After turning on the ignition, the control unit supplies voltage to the wheel speed sensors. The sensors use the Hall effect and generate an output signal in the form of rectangular pulses. The signal changes in proportion to the rotation speed of the pulse ring of the sensor installed in the wheel hub. Based on this information, the control unit determines the optimal wheel braking mode. There are the following operating modes of the anti-lock braking system: – normal braking mode. During normal braking, the solenoid valve is de-energized, the input valve is open, and the output valve is closed. When you press the brake pedal, brake fluid is pressurized into the slave cylinder through a solenoid valve and operates the wheel brakes. When the brake pedal is released, brake fluid returns to the master cylinder through the inlet and check valves; – emergency braking mode. If a wheel locks during emergency braking, the module sends a command to the solenoid valve to reduce the brake fluid supply, then voltage is applied to each solenoid valve. The inlet valve closes, the supply of brake fluid from the master cylinder is shut off, the outlet valve opens, and brake fluid flows from the slave cylinder into the master cylinder and then into the reservoir, which causes a decrease in pressure; – pressure maintenance mode. When the pressure in the working cylinder decreases to a maximum, the module issues a command to the solenoid valve to maintain brake fluid pressure; voltage is supplied to the input valve and not supplied to the output valve. In this case, the inlet and outlet valves are closed and the brake fluid does not leave the working cylinder; – pressure increase mode. If the module determines that the wheel is not locked, it de-energizes the solenoid valve. No voltage is supplied to the solenoid valves; brake fluid flows through the inlet valve into the working cylinder, the pressure in which increases.
If air gets into it, the hydroelectronic unit In this regard, to replace the unit, contact a service station.
The rear wheel speed sensor is installed in the rear hub. To replace it you will need: all the tools needed to remove the rear hub, plus an impact puller and a press. 1. Remove the rear wheel hub assembly with bearing and rear wheel speed sensor (see Replacement of the rear hub).
2. Press the sensor out of the hub bearing housing using an impact puller (“reverse hammer”), placing the puller grips on the flange of the sensor.
3. Press the new sensor until its flange stops into the hub bearing housing using a suitable mandrel and press. In this case, the left wheel speed sensor connector should take the position shown in the photo. For the right wheel speed sensor, the connector should be located on the opposite side.
Warning. It is strictly forbidden to press in the rear wheel speed sensor using a hammer.
The front wheel speed sensor is installed in the front hub in the same way as the rear wheel speed sensor; replace it with similar techniques described above in this subsection. The difference is that the front wheel speed sensor, due to its specific asymmetrical shape, can only be installed in the hub in one position. In this regard, the sensors are distinguished as right and left, which is reflected in their markings. To replace, purchase a sensor with the same markings as the removed sensor.
Opel Astra spare parts store Ekaterinburg8
All Opel Astra cars are equipped with an anti-lock braking system as standard. In addition, depending on the vehicle configuration, several more electronic braking control systems can be installed. All systems are closely interconnected and complement each other. This subsection describes in detail the anti-lock braking system installed on all vehicles. Warning. Attempts to independently interfere with the operation of electronic braking control systems will lead to failure of these systems. All maintenance and repair work on these systems must be carried out only at specialized service stations that have the necessary equipment and qualified personnel. Anti-lock brake system (ABS) prevents the brakes from locking up prematurely when braking while driving. The traction control system (TCS - Traction Control System) prevents the drive wheels from slipping when starting from a stop or intensive acceleration, for example, on a wet road. If wheel slip occurs, the TCS system forcibly reduces the engine's traction characteristics and, if necessary, applies the brakes to the slipping wheel. The anti-skid system (ESP), along with ABS, reduces the risk of uncontrolled skidding both when braking the car and when cornering. The ESP system operates in conjunction with the traction control system (TCS). The system constantly receives information about the steering angle and vehicle speed. If there is a danger of skidding, the car is stabilized on the selected trajectory by changing the traction characteristics of the engine and braking individual wheels. Warning. Electronic systems improve the handling and braking performance of a car, but do not replace the driver, since they cannot independently prevent incidents due to careless driving. Avoid making gross mistakes in driving by relying on assistance systems. Anti-lock braking system (ABS). The anti-lock brake system (ABS) consists of wheel speed sensors, a brake pedal switch, a hydroelectronic control module and a warning lamp in the instrument cluster. The anti-lock braking system is also equipped with a self-diagnosis system that detects malfunctions of system components. ABS serves to regulate the pressure in the brake mechanisms of all wheels when braking in difficult road conditions, preventing wheel locking. The ABS system provides the following advantages: – avoiding obstacles with a higher degree of safety, including during emergency braking; – reduction of braking distance during emergency braking while maintaining directional stability and controllability of the vehicle, including when turning. In the event of a system malfunction, diagnostic functions and maintenance of operation in the event of system failures are provided. The hydroelectronic control module receives information about vehicle speed, direction of travel and road conditions from wheel speed sensors, steering angle sensor, and throttle position sensor. After turning on the ignition, the control unit supplies voltage to the wheel speed sensors. The sensors use the Hall effect and generate an output signal in the form of rectangular pulses. The signal changes in proportion to the rotation speed of the pulse ring of the sensor installed in the wheel hub. Based on this information, the control unit determines the optimal wheel braking mode. There are the following operating modes of the anti-lock braking system: – normal braking mode. During normal braking, the solenoid valve is de-energized, the input valve is open, and the output valve is closed. When you press the brake pedal, brake fluid is pressurized into the slave cylinder through a solenoid valve and operates the wheel brakes. When the brake pedal is released, brake fluid returns to the master cylinder through the inlet and check valves; – emergency braking mode. If a wheel locks during emergency braking, the module sends a command to the solenoid valve to reduce the brake fluid supply, then voltage is applied to each solenoid valve. The inlet valve closes, the supply of brake fluid from the master cylinder is shut off, the outlet valve opens, and brake fluid flows from the slave cylinder into the master cylinder and then into the reservoir, which causes a decrease in pressure; – pressure maintenance mode. When the pressure in the working cylinder decreases to a maximum, the module issues a command to the solenoid valve to maintain brake fluid pressure; voltage is supplied to the input valve and not supplied to the output valve. In this case, the inlet and outlet valves are closed and the brake fluid does not leave the working cylinder; – pressure increase mode. If the module determines that the wheel is not locked, it de-energizes the solenoid valve. No voltage is supplied to the solenoid valves; brake fluid flows through the inlet valve into the working cylinder, the pressure in which increases.
ABS and ESP lights up HELP
#1
- Messages 5
*/–> 5
- Name: Igor
- Car: Opel Zafira B 1.8
- Registration: 11/22/2016
Car Opel zafira 1.8 mech. In November, the front right hub began to hum, I went to the Oiler service center and they installed a new one. I left until the new year and the ABS and ESP lights came on on my dashboard (the sensor is built into the bearing) I went there for service, without any questions they changed it for me with a new one that was more expensive, they say the company didn’t fit, let’s install another one (I note they changed it for free, thought it was a defect), and a week ago the lights came on again. I went back to them and they sent me to an electrician, he called and said that everything was fine with the wiring, the ABS sensor in the hub had failed. Again they replaced it under warranty for free, BUT this time the lights did not go out, the abs did not turn on. They say that the ABS control unit has failed, but this is not certain, you need to go to the electrician again. PLEASE TELL ME WHAT THE PROBLEMS ARE
Diagnostics shows the error “front right speed sensor” - malfunction
#2
- Posts 40,755
*/–> 40755
- Name: Valentin
- City: Lutsk
- Car: 3.0 KOMPRESSOR Opel Insignia 1.6T Opel Vectra C Honda CR-Z
- Registration: 07/15/2012
Diagnostics shows the error “front right speed sensor” - malfunction
Sex is like an Opel – designed to delight.
R/C Vectra C https://www.opel-club. r-korobka-i-td/ 0975105661
#3
And was born to run
- Posts 42,524
*/–> 42524
- Name: Andrey Alekseevich
- City: Kyiv
- Car: Small but very brave Astra Kati USER
- Registration: 11/11/2007
I apologize, but my work schedule is unstable at the moment. https://www.opel-club. alkino-zdorove/ 100 is an abbreviation.
My tel. 093-459-22-20 from 09-00 to 21-00
Faults are dirty and rusty. I'm for dirty ones, they're easier to fix.
#4
- Messages 5
*/–> 5
- Name: Igor
- Car: Opel Zafira B 1.8
- Registration: 11/22/2016
ABS light on Opel Astra h
I went on vacation for 2 weeks and decided to work on the car.
My ABS light came on, after a short drive it disappeared if I restarted it. After reading the reviews, they said that it could be due to dirt. My car hasn't been washed for a month. First of all, I dismantled the entire face, wheels, arches, washed the entire underhood thoroughly with a Karcher
On the next day I decided to disassemble the left hub, because... I have never changed it. In the area of the magnetic sensor there are 2 holes for draining water, and everything in these holes was clogged with dirt, I decided to take it apart and clean it.
Today the ABS light on the dashboard came on. I’m returning home from the country, I start the car and the indicator says that the left brake light has burned out. There’s nothing to change, so I’m going home. The road is disgusting: snow, mud, the day before we were literally covered in mud from head to toe.
After about 20-30 km of travel, the ABS indicator lights up and the speedometer needle begins to jump (amplitude - 5 km/h).
Stopped at a gas station. The indicator went out for a while, but came on again at the first braking. First, a notification comes on to check the left brake light, I press OK and the ABS comes on.
At the moment the indicator was triggered, a characteristic cracking sound of the system was heard. It didn’t happen again, but I didn’t brake sharply, and there wasn’t a chance - I got stuck in a traffic jam. All you could hear was some kind of squeaking. The car is 12 years old, mileage is 97 thousand.
- The ABC and ESP lights came on in the Opel Astra H - 3 answers
- Where is the ABS unit in the Opel Astra H, station wagon? – 1 answer
- ABS works until a complete stop in the Opel Astra H - 0 answers
Your speed readings are taken from the front wheel sensor. And judging by the fact that the speedometer needle was jumping, it seems that there is a malfunction of the ABS sensor or the contact to it is loose. And the light bulb is either a passing phenomenon or just a coincidence of events.
