Electric power steering reduces the effort on the steering wheel, making it easier to drive
The basis of the electric booster is a brushless electric motor with a gearbox located under the steering casing.
A worm is installed on the motor shaft, which engages with a plastic gear mounted on the steering shaft.
The electronic control unit coordinates the operation of the electric booster by changing the voltage supplied to the electric motor using information received from sensors of vehicle speed, crankshaft speed and the amount of torque on the steering shaft.
The electric motor turns the steering column shaft through a gearbox with a certain torque.
The control unit provides sufficient steering information in all vehicle driving modes.
When the car is stationary, the torque on the shaft created by the electric amplifier is maximum; as the vehicle speed increases, the “assistance” of the amplifier decreases and the steering wheel becomes “heavier.”
If the electric booster fails, the car fully retains controllability, while the steering wheel becomes somewhat “heavier” than on a car without an electric booster, since an additional load appears in the form of a freely rotating electric motor rotor
In the instrument cluster there is a fault indicator for the electric power steering.
It lights up when the ignition is turned on and goes out after the engine starts. If the electric booster fails, the indicator light is constantly on.
The electric booster does not work when the engine is not running.
The electric amplifier can be turned off:
- - when the on-board network voltage decreases;
- - in the absence of a signal from the speed sensor and the engine speed is above 1500 min -1
Such shutdowns are built into the operating algorithm of the electric amplifier and are not signs of a malfunction.
Withdrawal
You will need: a screwdriver with a Phillips blade, keys “8”, “13” (two), socket wrench “13”.
Disconnect the wire from the negative terminal of the battery.
Remove the steering wheel.
Pull towards you and remove the fuse box cover.
Remove the steering column switches.
Disconnect the wiring harness connector from the steering column switch connector.
Press the latch
Disconnect the ignition switch power harness connectors.
Disconnect the immobilizer reading coil wiring harness connectors.
Press the latch.
Disconnect the wiring harness connector from the electromechanical power steering control unit connector.
In the same way, disconnect the second block of the wiring harness from the control unit.
Unscrew the nut of the coupling bolt of the universal joint of the electromechanical amplifier on the side of the propeller shaft of the steering mechanism and remove the bolt.
Unscrew the two upper nuts securing the electromechanical amplifier to the body, unscrew the two lower nuts 3-4 turns
Remove the electromechanical amplifier from the car.
Loosen the clamp of the steering column switch connector
Remove the connector.
Remove the screw securing the protective casing.
Remove the cover.
Press the latch
Disconnect the wiring harness connector from the electromechanical power steering control unit
In the same way, disconnect the second block of the wiring harness from the control unit.
Remove the two screws securing the control unit to the electromechanical power steering bracket
Remove the control unit.
Pay attention to its markings so that when replacing, purchase a similar unit.
Install the electromechanical power steering in the reverse order of removal.
If, when adjusting the height, the steering wheel does not lock well in the specified position, tighten the locking pin nut