Nissan Rogue (T33) 2021-Present Service Manual: System Description :: System

Nissan Rogue (T33) 2021-Present Service Manual / Steering :: Steering Control System / System Description :: System

Eps System

System Description

SYSTEM DIAGRAM

Parts name Function
Power steering control module Refer to STEERING GEAR ASSEMBLY.
EPS motor Refer to STEERING GEAR ASSEMBLY.
Power steering torque sensor Refer to STEERING GEAR ASSEMBLY.
ECM

  • Transmits mainly the following signals to power steering control module via CAN communication:

    • Engine status signal

    • EPS assist request signal

    • Stop/Start status signal

  • Receives mainly the following signals from power steering control module via CAN communication.

    • Battery supply current signal

    • EPS torque on signal
ABS actuator and electric unit (control unit)

  • Transmits mainly the following signal to power steering control module via CAN communication:

    • Nissan Ariya Vehicle speed signal (ABS)
Steering angle sensor

  • Transmits mainly the following signal to power steering control module via CAN communication:

    • Steering angle sensor signal
Combination meter

  • Transmits mainly the following signal to power steering control module via CAN communication:

    • Nissan Ariya Vehicle speed signal (Meter)

  • Turns ON the power steering warning lamp according to the signal from the power steering control module via CAN communication.

DESCRIPTION

  • EPS system consists mainly of power steering control module, EPS motor, power steering torque sensor.

  • 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), steering angle sensor and combination meter via CAN communication and information received from power steering torque sensor.

  • Power steering control module performs an arithmetical operation on data, such as steering wheel turning force (sensor signal) from the power steering torque sensor, Nissan Ariya 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.

  • Power steering control module decreases the output signal to EPS motor while extremely using the power steering function (e.g., full steering) consecutively for protecting EPS motor and power steering control module (Overload protection control). Refer to Protection Function.

  • When the driver turns the steering wheel (torque application exceeding the specified torque) during stop/start, the power steering control module restarts the engine (disables stop/start system) and immediately brings the assist control in its ready-to-start state.

CONDITIONS FOR POWER STEERING WARNING LAMP ON

  • Turn ON when there is a malfunction in EPS system. If indicates that fail-safe mode is engaged and enters a manual steering state (Control turning force 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 Power steering warning lamp
Ignition switch ON. (Lamp check) ON
After engine start (steering assist force is generated) OFF
When steering assist is stopped ON

Fail-Safe

  • If any malfunction occurs in the system and control module detects the malfunction, power steering warning lamp on combination meter turns ON to indicate system malfunction.

  • When power steering warning lamp is ON, the system enters into a manual steering state. (Control turning force steering wheel becomes heavy.)

DTC Fail-safe condition
C1601-16 Manual steering state
C1601-17
C1604-96
C1608-43 Normal state (According to default calibration)
C1608-46
C1608-49 Manual steering state
C1608-52 Normal state
C1608-54 Normal state (According to default calibration)
C1615-4B Limit steering assist level state
C161A-82 Constant steering assist level state
C161A-83
C161A-86
C161B-82
C161B-83
C161B-86
C161C-82 Normal state
C161C-83
C161C-86
C161E-82
C161E-83
C161E-86
C161F-86 Lock the drive mode function to the last position or STANDARD/AUTO position
C1620-82 Normal state
C1620-83
C1621-86
C1622-86
C1624-00 Slowly reducing assistance state
C1632-86 Normal state
C1633-86
C1634-86
C163A-86
C163E-86
U0076-00
U1321-55 Normal state (According to default calibration)
U2140-87 Normal state
U2148-87 Normal state or constant steering assist level state
U214F-87 Normal state
U2156-87
U215B-87
U2176-87 Normal state or lock the drive mode function to the last position or STANDARD/AUTO position

Protection Function

Power steering control module decreases the output signal to EPS motor while extremely using the power steering function (e.g., full steering) consecutively for protecting EPS motor and power steering control module (Overload protection control). While activating overload protection control, the assist torque gradually decreases, and the steering wheel turning force becomes heavy. The normal assist torque is recovered if the steering wheel is not turned for a while.

Warning/indicator/chime List

Warning Lamp/Indicator Lamp

Name Design Layout/Function
Power steering warning lamp

For layout

  • Type A meter: Refer to Design.

  • Type B meter: Refer to Design.

For function

  • Type A meter: Refer to Power Steering Warning Lamp.

  • Type B meter: Refer to Power Steering Warning Lamp.
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