Nissan Note [3/22] Components

SYSTEM DESCRIPTION

STC-3

[EPS]

STC

SYSTEM DESCRIPTION PFP:00000

Components

BGS0002W

Electric Power Steering Function

BGS0002X

Fail-Safe Function

BGS0002Y

In case an unusual condition is encountered in the system, fail-safe function stops EPS control and the system

enters a fail-safe state. EPS warning lamp turns on to indicate unusual state, and enters a manual steering

state. (Control turning force of steering wheel becomes heavy.)

1. Steering wheel 2. Motor 3. EPS control unit

4. Steering gear assembly 5. Torque sensor 6. Reduction gear

A. Sensor processing signal B. Sensor signal C. Assist torque signal (motor drive)

D. Ignition power E. CAN (H) F. CAN (L)

G. Power supply H. Ground

SGIA1304E

Parts name Function

Electric power steering (EPS) control unit

● Outputs optimum assist torque signal to motor by steering wheel turning force

(sensor signal) from torque sensor and vehicle speed signal from CAN communi-

cation.

● Reduces output signals to motor and protects motor and EPS control unit when

using power steering continuously and excessively.

● Under unusual conditions of electric system, fail-safe function starts, output sig-

nal to motor is turned off, and then changes to manual steering. EPS warning

lamp turns on to indicate system error.

● Controls communication with other control units by using CAN communication.

● Allows system diagnosis with CONSULT-II

Motor

● Produces assist torque by control signal from EPS control unit.

Torque sensor

● Detects steering wheel turning force and outputs sensor signal to EPS control

unit.

Reduction gear

● Increases motor-produced assist torque by worm gear and transmits it to column

shaft.

EPS warning lamp

● Turns on when fail-safe function operates, and indicates manual steering state.

● Turns on when key switch is turned on to check value, and turns off after engine

starts