A forum dedicated to the 1992-1995 Honda Civic.
Electric Power Steering (EPS) System
The S2000 uses an electrically assisted power steering system in place of the more commonly used hydraulically assisted system. The electric system requires less power from the engine to operate than a hydraulic system, which ultimately benefits performance and fuel economy. The system's compactness and simplicity also offer more design freedom. The system consists of a toothed rack and pinion gear, with a microprocessor-controlled, coaxial electric motor assisting the rack. The microprocessor senses vehicle speed and steering torque and is programmed to vary boost accordingly, providing more boost at low speeds and progressively less at higher speeds. Failure warning, self-diagnosis and self-protection functions are built into the system. The S2000 has a steering ratio of 14.9:1.
A "steering sensor" is located on the input shaft where it enters the gearbox housing. The steering sensor is actually two sensors in one: a "torque sensor" that converts steering torque input and its direction into voltage signals, and a "rotation sensor" that converts the rotation speed and direction into voltage signals. An "interface" circuit that shares the same housing converts the signals from the torque sensor and rotation sensor into signals the control electronics can process.
