System Description

SYSTEM DIAGRAM 

Courtesy of NISSAN NORTH AMERICA, INC.

INPUT SIGNAL AND OUTPUT SIGNAL 

Communicates the signal from each control unit via CAN communication:

DESCRIPTION 

• EPS system consists mainly of EPS control unit, EPS motor, torque sensor and steering gear assembly.

  Courtesy of NISSAN NORTH AMERICA, INC.

• 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, 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.