Honda Acura NSX 1991 Service Manual page 604

Rotation Sensor
The rotation sensor is housed inside the steering gearbox near the pinion. It converts the rotation speed and direction
of steering into voltage signals. The rotation of the steering wheel is transmitted to the pinion, which drives the sensor
by accelerating its speed through the three pieces of transmission the gears. Acting as a kind of direct current generator,
the sensor generates direct current voltage proportionately with the rotational speed of the pinion. When the steering
direction is reversed, the voltage is generated in the opposite direction. No power is generated when driving straight
ahead without turning the steering wheel.
Interface Circuit
The interface circuit is housed inside the steering gearbox near the pinion. It rectifies and amplifies the signals from the
torque sensor and the rotation sensor and transmits steering signals to the control unit. A phase compensating circuit
is also built in, which changes the output signals in accordance with the drive signals input from the control unit.
SENSOR