Service Notice And Precautions For Hydraulic Pump Electric Power Steering System

Check if air pressure and size of tires are proper, the specified part is used for the steering wheel is genuine part.
Check if the connection of steering column assembly and steering gear assembly is proper (there is not looseness of mounting bolts, damage of rods, boots or sealants, and leakage of grease, etc.).
Check if the wheel alignment is adjusted properly.
Check if there is any damage or modification to suspension or body resulting in increased weight or altered ground clearance.
Check if installation conditions of each link and suspension are proper.
Check if the battery voltage is proper.
Check connection conditions of each connector are proper.
Check that NISSAN genuine power steering fluid (E-PSF) is used. If power steering fluid other than genuine fluid is used, steering may become extremely hard.
You may hear a high pitch noise from the front of the vehicle when the steering wheel is operated, especially at low speed such as a parking lot. However this is not a malfunction. Steer at low speed condition makes higher load for steering rack, so pump works higher rotation to provide more hydraulic flow to create more power assistance for lighter steering effort. This pump rotation is electrically controlled based on rotation map in ECU.
Before connecting or disconnecting the power steering control module harness connector, turn ignition switch "OFF" and disconnect battery ground cable. Because battery voltage is applied to power steering control module even if ignition switch is turned "OFF".