Nissan GT-R (R35) · Service Manual STEERING

EPS SYSTEM

EPS

System Diagram

 
 CONTROL DIAGRAM
 
 CROSS-SECTIONAL VIEW


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1.
 		Combination meter
 		2.
 		Power steering control unit
 		3.
 		Power steering solenoid valve
4.
 		Steering gear assembly
 		5.
 		Gear housing assembly
 		6.
 		Gear sub-assembly
7.
 		Pinion
 		8.
 		Power steering oil pump
 		9.
 		Reservoir tank

System Description


  • The EPS system controls the power steering solenoid valve through the power steering control unit.
  • The valve driving voltage to control the power steering solenoid valve varies according to the vehicle speed.
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 OPERATION PRINCIPLE
 
 During Parking (When Turning The Steering Wheel To The Right.)


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  1. Power steering solenoid valve is closed while a vehicle is stopped.
  2. Pinion “1R”, “2R” and “3R” are closed depending on steering torque of steering wheel.
  3. Oil pressure “P” in the gear housing assembly is the sum of oil pressures occurred in “2R” and “3R”. This results in a light steering force because of high pressure.
 
 During High-speed Operation


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  1. Power steering solenoid valve is opened during high-speed operation.
  2. Pinion “1R”, “2R” and “3R” are closed depending on steering torque of steering wheel.
  3. Oil pressure “2R” does not occur because the power steering solenoid valve is on full throttle.
  4. Oil pressure “P” in the gear housing assembly includes only oil pressure occurred in “3R” and results in a heavy steering force.

Component Parts Location



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1.
 		Power steering solenoid valve
 		2.
 		Power steering control unit

A.
 		Steering gear assembly
 		B.
 		Glove box assembly removed

: Vehicle front

Component Description


Component parts
 		Reference/Function
Power steering control unit
  • Signals from various sensors control the driving voltage to the power steering solenoid valve.
  • The power steering control unit controls the driving voltage to the power steering solenoid valve for maintaining the power steering assist force when the fail-safe function is activated. (The engine speed signals control EPS system if any vehicle speed signal error is detected.)
Combination meter
 		Description (GT-R certified NISSAN dealer)
ECM
 		Description (GT-R certified NISSAN dealer)
Power steering solenoid valve
 		Description (GT-R certified NISSAN dealer)