OPERATION PRINCIPLE
During Parking (When Turning The Steering Wheel To The Right)
Scheme 1
- Power steering solenoid valve is closed while a vehicle is stopped.
- Pinion "1R", "2R" and "3R" are closed depending on steering torque of steering wheel.
- Oil pressure "P" in the gear housing assembly is the sum of oil pressures occurring in "2R" and "3R". This results in a light steering force because of high pressure.
During High-speed Operation
Scheme 2
- Power steering solenoid valve is opened during high-speed operation.
- Pinion "1R", "2R" and "3R" are closed depending on steering torque of steering wheel.
- Oil pressure "2R" does not occur because the power steering solenoid valve is on full throttle.
- Oil pressure "P" in the gear housing assembly includes only oil pressure occurring in "3R" and results in a heavy steering force.
Scheme 3
Component Description
| Component parts | 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 | Refer to " DESCRIPTION ". |
| ECM | Refer to " DESCRIPTION ". |
| Power steering solenoid valve | Refer to " DESCRIPTION ". |
COMPONENT DESCRIPTION
Description
EPS system functions by ignition power supply.
Power steering solenoid valve controls the power steering oil pressure in the gear housing assembly.
ECM sends engine speed signal to power steering control unit.
Combination meter sends vehicle speed signal to power steering control unit.
- Hard steering when fully turning the steering wheel.
- Light steering when driving at a high speed.
See also:
• REMOVAL AND INSTALLATION