Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
System Outline
The ECU of the PPS (Hydraulic reaction type) controls the hydraulic pressure applied to the hydraulic reaction chamber in the gear box control unit to change the steering force and provide optimum steering feeling at any vehicle speed and under any steering conditions.
PPS Operation
When the ignition SW is turned on, the starting current flows from the ABS-IG fuse to TERMINAL 4 of the PPS ECU. The vehicle speed sensor monitors the vehicle speed and transmits control signals to TERMINAL 5 of the ECU.
When the vehicle speed is low, the PPS ECU sends a higher-current from TERMINAL 1 of the ECU to TERMINAL 1 of the PPS solenoid to TERMINAL 2 to TERMINAL 2 of the 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.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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