Saturn Saturn ASTRA Specifications download pdf (Page 25)

Chassis Specialist : Electric Power Steering

Page 22

the fluid is low top up with the special Saturn power steering fluid for this vehicle. Do not overfill the

system.

A scan tool must be used to access system diagnostic trouble codes and perform the steering control

module setup.

HONDA ELECTRIC POWER STEERING (EPS) SYSTEM

Honda uses a rack drive electric motor for the EPS system used on the Civic Si. The system consists of

an EPS control module, EPS motor, torque sensor and a centre take off steering gear. The EPS control

unit receives data from the torque sensor, the vehicle speed sensor and the ECM for engine speed.

Based on the information provided by the inputs, the EPS controller will inform the ECM of the power

steering operation via the power steering switch and command the EPS motor to operate.

The EPS controller also monitors the power steering system for faults. The EPS controller performs

two different self diagnostic modes. One is done when the engine is initially started and ends after the

bulb check. The second mode continues after the first is completed and will continue until the ignition

switch is turned off. If a system fault is detected, the EPS controller will command the EPS indicator in

the instrument panel on, store the trouble code and will disable the electric assist. Manual steering will

still be available. If the EPS controller cannot store the trouble code, the EPS indicator in the

instrument panel will begin to flash. Once a diagnostic code has been set the EPS controller will store

the code—but can only store the single code once. If the code is continuously resetting, the information

stored by the EPS controller will be from the last failure. The EPS controller is located behind the right

side kick panel

The torque sensor on the Honda EPS system is mounted on the steering gear pinion. The sensor is a

dual signal analogue 6 wire sensor that transfers the mechanical rotation of the steering shaft to an

electrical signal the EPS controller can use. The sensor connector has seven cavities but only six are

used.

Cavity

Purpose

Sensor Output (VT6)

Reference Voltage 5 Volts

Sensor Output (VT3)

Sensor Ground

Not Used

Reference Voltage 12 Volts

Torque Signal Output (5 volts momentarily on start up)

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Saturn Saturn ASTRA Specifications Page 25