Nissan Sentra B18 (2020-2025) Service Manual: Eps System

Nissan Sentra B18 (2020-2025) Service Manual / Steering / Steering Control System :: System Description / System / Eps System

System Description

System Description

SYSTEM DIAGRAM

INPUT SIGNAL AND OUTPUT SIGNAL

Communicates the signal from each control unit via CAN communication:

Control unit	Signal status
ECM	Transmits the following signals to EPS control unit via CAN communication: Engine status signal EPS assist request signal
ABS actuator and electric unit (control unit)	Transmits the following signal to EPS control unit via CAN communication: Nissan Sentra Vehicle speed signal (ABS)
Combination meter	Transmits the following signal to EPS control unit via CAN communication: Nissan Sentra Vehicle speed signal (combination meter) Receives the following signal from EPS control unit via CAN communication: EPS warning lamp signal
Chassis control module (with built in steering angle sensor)	Transmits the following signal to EPS control unit via CAN communication: Steering angle sensor signal

DESCRIPTION

EPS system consists mainly of EPS control unit, EPS motor, torque sensor and steering gear assembly.
EPS system calculates a control signal to transmit to the EPS motor based on information received from ECM, ABS actuator and electric unit (control unit), Chassis control module (with built in steering angle sensor) and combination meter via CAN communication.
EPS control unit performs an arithmetical operation on data, such as steering wheel turning force (sensor signal) from the torque sensor, Nissan Sentra vehicle speed signal, etc. Then it generates an optimum assist torque signal to the EPS motor according to the driving condition.
After engine start, the EPS system performs control.
When a malfunction occurs in the system, the fail-safe function stops the EPS system (manual steering state) or restricts its operation (Constant steering assist level state). Refer to Fail Safe.
EPS control unit decreases the output signal to EPS motor while extremely using the power steering function (e.g., full steering) consecutively for protecting EPS motor and EPS control unit (Overload protection control). Refer to Protection Function.

EPS WARNING LAMP INDICATION

Turns ON when there is a malfunction in EPS system. If ON, fail-safe mode is engaged and the system enters a manual steering state (turning force at steering wheel becomes heavy).
Also turns ON when ignition switch is ON, for purpose of lamp check. Turns OFF after the engine starts, if system is normal.

Condition	EPS warning lamp
Ignition switch ON. (Lamp check)	ON
Engine running	OFF
EPS system malfunction [Other diagnostic item]	ON

CAUTION:

EPS warning lamp also turns ON due to data reception error, CAN communication error etc.

Warning/indicator/chime List

Warning Lamp/indicator Lamp Warning Lamp/Indicator Lamp Name Design Layo ...

Other materials:

Dtc Description
DTC Description DESCRIPTION CAN (Controller Area Network) is a serial communication line for real time applications. It is an on-Nissan Sentra vehicle multiplex communication line with high data communication speed and excellent error detection ability. Modern Nissan Sentra vehicle i ...

Led Headlamp Operation Inspection
Work Procedure Work Procedure CHECK START In the cool LED status (wait for more than 10 minutes after turning headlamp OFF), turn ON and turn OFF headlamp for the several times. Check that headlamp ...

System
STARTING SYSTEM (WITH INTELLIGENT KEY) Component Parts Location Starter motor Transmission range switch (CVT Models) IPDM E/R (view with air inlet duct removed) Clutch interlock switch (M/T Models) ECM Component Description Component part Description Starter ...