Electronic Power Steering; Eps System Diagnosis - Polaris 2015 RZR 900 Service Manual

ELECTRICAL

ELECTRONIC POWER STEERING

EPS Operation
The EPS module is an intelligent electronic power
steering system that operates off of the vehicle's 12V
electrical system. It calculates steering assist by sensing
the difference between the input torque of the steering
post and the output torque required to turn the wheels,
and then provides assist by energizing an electric motor.
The process provides a smooth, seamless assist.
The system is continuously running diagnostic checks
and monitoring factors such as battery voltage, ground
speed and engine speed. In the event an internal or
external issue that affects the EPS system is detected,
the system will illuminate a fault indicator and transition
to a normal mechanically coupled steering system. The
system is Polaris Digital Wrench® compatible for
simplified diagnostics
through the vehicle's diagnostic port.
With the engine off and the key on, the power steering
unit will operate for up to five minutes. After the five
minutes, you will need to cycle the key switch and restart
the engine to regain power steering operation.
NOTE: To conserve battery power, the EPS unit will
shut down 5 minutes after the engine has stopped if
the key remains in the ON position. At this point, the
EPS Malfunction Indicator Light will illuminate to
indicate the EPS has shut down and will set a fault
code in Digital Wrench®.
The Power Steering 20A Fuse.
• If the fuse fails, the Power Steering Malfunction
Indicator Light (MIL) on the instrument cluster will
illuminate. During this time, the vehicle will have
no power steering operation. You will be able to
connect and communicate with the vehicle's
Engine Controller, but not the Power Steering
Controller, while using Digital Wrench®.
CAUTION
DO NOT SPLICE OR CUT INTO THE CAN CIRCUITS.
IMPORTANT: Electronic Power Steering (EPS)
units are not interchangeable between ATV,
RZR and RANGER product lines.
NOTE: See Chapter 5 – Power Steering Unit
Removal, page 8.10 for power steering unit
removal and installation procedures.
11.28
and system troubleshooting
9925723 R01 - 2015 RZR 900 Service Manual
© Copyright 2014 Polaris Industries Inc.
2–Pin Connector
WIRE COLOR FUNCTION
Main Power (20A Protected)
ORANGE
BROWN Ground
8–Pin Connector
WIRE COLOR FUNCTION
Key-On Battery Voltage
ORANGE
CAN High Signal
YELLOW
CAN Low Signal
GREEN

EPS System Diagnosis

READ BEFORE YOU REPLACE THE EPS UNIT!
NOTE: Verify the EPS unit has the latest software
version and calibration loaded before replacing the
EPS unit. If an older version is found using Digital
Wrench, update the software to the latest version
and follow guided diagnostic procedures available
for any Digital Wrench codes found.