Description and operating principle of the steering control

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Shown is the 2.0L variant, other variants are generally similar




Pos.Spare Part NoName
1Steering wheel
2Steering column
3Case
4Steering rod
5Tie rod end
6Steering gear
7Hose running from the steering gear to the working fluid cooler
8Working fluid cooler
9Power Steering Pressure (PSP) Switch
10Power steering pump
11Feed hose
12Reservoir for working fluid
13The hose that goes from the pump to the steering gear
14Steering column shaft coupling

Operating principle


The rotation of the steering wheel is transmitted to the steering gear via the steering column shaft. The rack and pinion steering gear converts this rotational motion into linear translational (lateral) motion. This motion, in turn, is transmitted to the steering knuckles via the transverse steering rods and steering rod ends.

The power steering pump supplies hydraulic fluid under pressure to the steering gear. As the steering wheel is turned, the hydraulic fluid passes through the steering gear valve to one side of the double-acting piston. The side to which the hydraulic fluid is supplied depends on the direction in which the steering wheel is turned. The hydraulic fluid moves the piston, which is part of the steering gear, providing the force needed to create the force required to turn the steering wheel.

Petrol engine variants, due to the additional load on the engine from the power steering pump, have a power steering pressure (PSP) switch. The switch, a normally closed relay, sends a signal to the powertrain control module (PCM) during low-speed parking maneuvers. The PCM responds by maintaining engine speed at idle.







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