5520 Apr 20
Electric power steering on the Toyota Corolla reduces the force that must be applied to turn the steering wheel. It is very convenient for precise control of the car, works reliably, provides a stable response to turning the steering wheel, provides comfortable driving and easy control. It is superior to power steering in many respects: it has a long service life, consumes much less energy, and ensures safe driving. Toyota Corolla 120 is known for problems with electric power steering. On the Corolla 150, the manufacturer improved the design, made it reliable, affordable, and removed all the shortcomings that the E12 had.
Features of work
The EUR on the Toyota Corolla turns on after the engine starts. You can determine whether it is working or not by the characteristic buzzing sound of the electric motor. The operating circuit of the electric booster is simpler than that of the power steering. It transmits auxiliary force to the steering wheel, facilitating its rotation depending on the speed of the vehicle.
The system includes a control unit, a servo drive, sensors that measure the degree of steering rotation and torque, and an electric motor, which is located under the dashboard on the steering column. The control unit is located under the instrument panel on the front panel. It gives the desired signal for changing the torque depending on the speed of movement.
Sometimes, after prolonged active use of the steering wheel or long-term fixation of it in the extreme position, the ease of its rotation decreases. This way the system prevents overheating and protects the steering rack from wear. Usually everything is restored if you stop turning the steering wheel and return it to its original position. Recovery takes 10-15 seconds.
The Toyota Corolla 120 EUR could not withstand heavy loads. It often overheated. It was impossible to predict at what start the amplifier operation error might come on. The power steering has been updated since 2013. The relay is more powerful, the electrics can withstand prolonged active steering turns. The power steering error light began to light up much less frequently, mainly at the end of the service life of the electric motor.
The Toyota Corolla control unit may turn off due to poor connection of the connections. Possible rust formation, oxidation of metal terminals at high humidity, and strong mechanical shock to the machine from the unit. The steering wheel instantly becomes heavy. To turn it you need to apply good force. The power steering light on the dashboard comes on and a beep is heard. This is a malfunction in the EUR system.
You can try turning off the engine, then starting it or removing the terminals from the battery, first the negative one, then the positive one. The error may disappear, the steering wheel will work. If this experiment fails, then you need to remove the control unit, solder the contacts or install a new one. The control unit for Toyota Corolla is available for left-hand drive and right-hand drive.
If the control unit does not work, then manual remains. It's hard to drive, but it's possible to get to the service station.
How does air conditioning work on Toyota Corolla?
The air conditioning in your Toyota Corolla works the same way as in your refrigerator, the truth is that it works with a compressor and a gas refrigerant system which, depending on its state (liquid or gas), produces cold. This system operates in a closed loop. Here are the main parts that will ensure your Toyota Corolla's air conditioner operates correctly:
- Compressor : This is the main component of your air conditioner, it regulates the pressure in your circuit and controls the circulation of fluids in the circuit.
- Condenser: This small coil has the purpose, like a radiator, to allow the gas to reduce its temperature and return to a liquid state (55 degrees).
- Blower and Evaporator: The heating fan exposes the pressurized liquid to high temperatures, causing it to turn directly into gas, and during this transition produces cold that is directed by the evaporator into the passenger compartment.
In fact, this device operates in a closed loop, and by creating fluctuations in temperature and pressure, the refrigerant gas can change state, resulting in the release of heat or cold. You now know how the air conditioner works in your Toyota Corolla.
Why doesn't the EUR work?
The most common cause of electric power steering failure is natural wear and tear on connections and terminals. Any mechanism is designed for a certain period of operation, after which the driver must be attentive to the operation of the vehicle’s systems and components.
The amplifier may fail due to severe road conditions. This causes a knocking sound in the steering column. You need to check its power fuse in the mounting block.
Voltage surges in the electrical circuit, problems with the battery, and lack of ground also affect the operation of the power steering.
Strong humidity, condensation in the control unit, sub-zero temperatures have a negative effect. Temporary interruptions in system operation are possible.
The electric power steering may stop working due to problems with the speed sensor, since it is directly connected to the speedometer. At low speeds, the force applied to turn the steering wheel increases; at high speeds, it decreases. An increase in engine speed causes a malfunction of the amplifier.
Symptoms of EUR malfunction
The most obvious one is the warning light on the dashboard coming on. It's a steering wheel with an exclamation mark. This icon comes in two colors – yellow and red. In the first case, you can drive the car, but you need to pull out the fuse for the electric power steering to completely cut off the power. In the second case, driving is not recommended; the power steering mechanism may block the steering wheel or you will lose complete control of the steering wheel.
The second sign can be considered the appearance of “heaviness” on the steering wheel , like on a domestic “classic”. At the same time, the buzzing of the electric motor will not be heard from under the steering column in the case of Kalina and Priora. This failure is reinforced by a warning indicator on the dashboard.
Fuse blown . This is a clear sign of a serious malfunction in the electric amplifier. The cause may be problems in the electrical part - oxidized contacts, damaged wiring, short circuit. Failures in the mechanical part of the power steering can also lead to a blown fuse - jamming of the gearbox or destruction of the steering rack. This leads to increased load on the amplifier motor, and as a result, a large current flows through the fuse.
Increased car engine speed at idle can serve as an indirect sign of a breakdown of the electric power steering.
Repair
When repairing a Toyota Corolla, it is not necessary to change the entire mechanism. It is possible to replace only the electric motor, control unit or its components. Diagnosing the causes of failure will help you pinpoint where the system is failing, which will simplify repairs and help save your budget.
After repair work, you need to check the wheel alignment, otherwise the electric power steering sensor will produce different forces when turning right and left.
Often the repair ends with replacing the blown fuses of the amplifier control unit. New fuses should be 40A.
An open circuit, a failed relay, or bad contacts are determined using instruments that measure the resistance of the electrical circuit.
To get to the EUR control unit itself, you must first remove the instrument panel, then the dashboard. The amplifier unit is located on the top shield. It is attached to the shield with two bolts. It is better to turn off the airbag so as not to hit it when you pull out the block. They are nearby. A detailed algorithm for removing the control unit is presented in many videos on the Internet. The block on the King does not like non-original spare parts. By installing relays from other brands of cars, you risk again encountering the problem of electric power steering failure.
Where to look for the reason
Electrical problems may occur due to oxidized connector contacts. The ingress of moisture and dirt impairs the conductivity of the contacts, and as a result, errors in the operation of the EUR.
Failures in the electronics may be due to loss of signal from the torque sensor. For example, on domestic cars the contacts are poorly soldered. Over time, they “go away”, and problems with the electric booster begin. It is enough to clean them and solder them well and the problem will disappear. If the speed sensor does not work, the EUR will generate an error and refuse to work.
Fuse . Even if it looks intact, you need to examine it carefully. There were cases when the amplifier turned off and generated error 1058 “Engine, phase windings shorted” (relevant for VAZ models) due to burnt fuse contacts. Cleaning the contact surfaces or replacing the fuse eliminated the malfunction of the electric amplifier.
The reason for the failure of the amplifier may be in the mechanical part. This applies to the gearbox and steering rack. The first one may jam due to water and dirt getting into the planetary gears or their physical destruction - read “Design and principle of operation of the electric power steering.”
Damage to the rack boots leads to water, dust and dirt getting inside. This destroys the rack from the inside, the bearings are damaged, and the steering mechanism jams. There were cases when the ridges were licked onto the slats, the “worm” of the shaft rotated, and the connection between the car’s wheels and the steering wheel was lost.
Some tips for using air conditioning in your Toyota Corolla
Finally, the last section of our content, now that you understand how to turn on the air conditioning on your Toyota Corolla, we will give you some practical tips on how to improve the use of your air conditioner and maintain it:
- When you get into your Toyota Corolla left in the sun, first open the windows at the same time to let the air conditioner get rid of excess hot air, and then close them again to turn on the air conditioner.
- During the winter months, you can use your air conditioner to remove the mist from your tiles, the dehumidifier will make it more efficient than your heating system.
- Turn off the air conditioning in your Toyota Corolla 5 minutes before turning off the engine to preserve the air conditioning compressor and prevent moisture odors in the cabin. If you notice unpleasant odors coming from the air conditioner in your Toyota Corolla, read our article on this topic.
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- Turn on your Toyota Corolla's air conditioning regularly, even in winter, to keep it working efficiently.
- Do not set the air conditioner at a temperature too different from the outside temperature, otherwise you may get sick. In addition, direct the air flow not directly to your face, but to your arms or chest.
If you have any additional questions about the Toyota Corolla, don't hesitate to contact us. Toyota Corolla category.
