What Causes the Heavy Steering Wheel in the Classic Sylphy's Electric Power Steering System?
2 Answers
The reasons for the heavy steering wheel in the Classic Sylphy's electric power steering system are as follows: Excessive tightness between the rolling bearings and sliding bearings connected in the steering system, the pump pressure of the power steering pump failing to meet the standard value, low hydraulic pressure in the steering gear, and the presence of air in the steering system. Excessive tightness between the rolling bearings and sliding bearings connected in the steering system can reduce the lubrication effect of the bearings, causing sticking phenomena, which manifests as a heavy steering wheel. Lubricating oil can be added. When the pump pressure of the power steering pump fails to meet the standard value, the steering wheel will feel heavy during use. Check the flow control valve; if there is leakage in the flow control valve or safety valve during driving, it can be repaired by grinding. Then, check if the spring of the safety valve is failing. The pump pressure can be adjusted at a 4S shop. When the hydraulic pressure in the steering gear is low, the steering wheel will also feel heavy. If the heavy steering wheel is caused by low hydraulic pressure in the steering gear, it is necessary to promptly visit a repair shop for maintenance. When there is air in the car's steering system, not only will the steering feel heavy, but there will also be noise during steering. It needs to be addressed promptly to avoid unnecessary losses later.
Last year when I was driving my old Nissan Sylphy, I encountered a sudden steering wheel stiffening issue. At first I thought it was due to underinflated tires, but that wasn’t the case. The mechanic diagnosed several common problems: firstly, the small motor in the steering gear (the electronic power steering motor) might be malfunctioning or have loose wiring; secondly, the computer module controlling the power steering could be faulty—this module is located behind the glove box and is quite troublesome to repair; thirdly, the torque sensor below the steering wheel might be inaccurate, failing to respond to steering inputs; fourthly, unstable battery voltage or insufficient alternator output could be starving the power-hungry steering system. It’s recommended to check the trouble codes first and avoid driving with excessive force, as a stiff steering wheel is particularly taxing on the arms.
