Nissan Rogue Service Manual: System
EPS SYSTEM
EPS SYSTEM : System Description
SYSTEM DIAGRAM
INPUT/OUTPUT SIGNAL
Communicates the signal from each control unit via CAN communication.
|
Control unit |
Signal status |
| ECM |
|
| ABS actuator and electric unit (control unit) |
|
| Combination meter |
|
DESCRIPTION
- 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.
- In case of an error in the electrical system, the fail-safe function stops output signals to the EPS motor. Refer to STC-8, "EPS SYSTEM : Fail-Safe".
- EPS control unit decreases the output signal to EPS motor during extreme use of the power steering function (e.g., full steering) for protection of the EPS motor and EPS control unit (Overload protection control).
- Extensive steering at low speed will cause the EPS control unit
and EPS motor to heat up. Once temperature reaches the critical
point, the EPS control unit will reduce current to reduce heat up.
System will recover as temperature lowers (reduced or no assistance).
EPS WARNING LAMP INDICATION
- Turns ON when there is a malfunction in the 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 turned 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.
EPS SYSTEM : Fail-Safe
- If any malfunction occurs in the system and the control unit detects the malfunction, the EPS warning lamp in the combination meter turns ON to indicate system malfunction.
- When EPS warning lamp is ON, the system enters into a manual steering state. (turning force at steering wheel becomes heavy.)
- Under abnormal vehicle speed signal conditions, vehicle speed is judged as constant
EPS SYSTEM : Protection Function
While overload protection control is activated, assist torque gradually decreases and the steering wheel turning force becomes heavy. Assist torque returns to normal if the steering wheel is not turned for a while.
Component parts
Component Parts Location
Steering column assembly
No.
Component
Function
1
ABS actuator and electric unit (control unit)
Transmits the following signal ...
Diagnosis system (EPS control unit)
CONSULT Function
FUNCTION
CONSULT can display each diagnostic item using the diagnostic test modes
shown following
Diagnostic test mode
Function
ECU identification
The p ...
Other materials:
Range
Principle
The range indicates the distance that can still be
covered with the current full tank of fuel.
General information
The estimated range available with the remaining
fuel is permanently displayed in the instrument
cluster.
With a low remaining range, a Check Control
message is briefly displ ...
Compression pressure
CHECKING COMPRESSION PRESSURE
Warm up the engine to full operating temperature.
Release the fuel pressure. Refer to EC-144, "Work Procedure".
Remove the ignition coil and spark plug from each cylinder. Refer
to EM-36, "Removal and Installation"
and ...
U1000 CAN COMM CIRCUIT
Description
CAN (Controller Area Network) is a serial communication line for real time
application. It is an on-vehicle multiplex
communication line with high data communication speed and excellent error
detection ability. Many electronic
control units are equipped onto a vehicle, and each co ...
