Use a tester to check for short circuits in the motor.
Connector & terminal
(PS2) No. 1 — Steering gearbox body:
(PS2) No. 2 — Steering gearbox body:
(PS2) No. 3 — Steering gearbox body:
Is the resistance 1 MΩ or more?
Replace the power steering control module.
Replace the steering gearbox.