Progressive Power Steering - Diagnosis: Overview Lexus LS III рестайлинг

SYSTEM DESCRIPTION

The PPS (Progressive Power Steering) is vehicle speed sensing type power steering, which increases/decreases steering effort in accordance with vehicle speed.

The power steering ECU assy sends a control signal to the steering gear (PPS linear solenoid valve assy) based on a vehicle speed signal. This system enables obtainment of a heavy steering feeling when driving at high speeds.

1. Power steering ECU assy The power steering ECU assy receives a vehicle speed signal from the combination meter. It then sends a signal to the PPS linear solenoid valve assy.
2. PPS linear solenoid valve assy The PPS linear solenoid valve assy controls power steering fluid pressure by receiving a signal from the power steering ECU assy.