It means that there is air in the hydraulic power steering system or too much power steering fluid. If there is air in the power steering system, start the engine, the power pump works, the oil and air mix back to the steering canister, it will be sprayed, exhaust the air can be, start the engine, make sure that the steering canister has oil and is not lower than the minimum scale.
Electro-hydraulic power steering system:
Main components: oil tank, power steering control unit, electric pump, steering gear, power steering sensors, etc., of which the power steering control unit and the electric pump is a whole structure.
Working principle: electro-hydraulic power steering system overcomes the shortcomings of the traditional hydraulic power steering system. It uses a hydraulic pump is no longer directly driven by the engine belt, but an electric pump, all of its working conditions are calculated by the electronic control unit according to the vehicle's driving speed, steering angle and other signals to the most ideal state.