Supra L6-2997cc 3.0L DOHC MFI (1998)
Steering Control Module: Description and Operation
The PPS (Hydraulic reaction type) controls the hydraulic pressure applied to the hydraulic reaction chamber in the gear box control unit using the PPS
ECU, to change the steering force and provide optimum steering feeling at any vehicle speeds and under any steering conditions.
1. PPS OPERATION
When the ignition SW is turned ON the starting current flows from the ECU-IGfuse to TERMINAL 4 of the PPS ECU. The PPS ECU monitors
vehicle speed, input signal to TERMINAL 5 of the PPS ECU. When the vehicle speed is low, the PPS ECU sends a higher-current from
TERMINAL 1 of the PPS ECU to TERMINAL 1 of the solenoid valve to TERMINAL 2 to TERMINAL 2 of the PPS ECU to TERMINAL 6
to GROUND, increasing the solenoid valve opening angle to provide comfortable steering operation. When the vehicle speed is high the PPS
ECU decreases the solenoid valve opening angle by reducing the current to the valve to provide responsive steering feeling.
