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10.37
ELECTRICAL
10
9923142 - 2011 RANGER RZR / RZR S / RZR 4 Service Manual
© Copyright 2010 Polaris Sales Inc.
ELECTRONIC POWER STEERING (EPS)
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 and system
troubleshooting 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 either cycle the key switch or start the engine to regain
power steering operation.
The Power Steering 30A 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™.
NOTE: DO NOT SPLICE OR CUT INTO THE CAN
CIRCUITS.
NOTE: See Chapter 5 “Body/Steering/Suspension”
for power steering unit removal and installation
procedures.
EPS 8-Way Wire Harness Connector
The 8-way connector, two rows of four pins, does not have a
channeled lock on both sides, allowing it to be installed 180°
from its intended position. The connector will not positively
engage or snap into place while in the wrong position, but can
still be installed. If the connector is not installed correctly, the
Power Steering Unit will not function. This situation can be
avoided by paying close attention when installing the 8-way
connector. If the 8-way is connected properly, the vehicle should
have assist with the key on.
Proper EPS System Diagnosing
READ BEFORE YOU REPLACE THE EPS UNIT!
IMPORTANT: Try to reflash the EPS unit before
attempting to replace it. A simple reflash may be all
that is needed to repair the EPS problem. Always
reflash the EPS unit as the first step in diagnosing an
EPS problem.
WARNING
Electronic Power Steering (EPS) units are not
interchangeable between ATV and RANGER
product lines.
Wire Color Functions
WIRE COLOR FUNCTION
ORANGE (2-Pin) Main Power (30A Protected)
BROWN (2-Pin) Ground
ORANGE (8-Pin) Key-On Battery Voltage
YELLOW (8-Pin) CAN High Signal
GREEN (8-Pin) CAN Low Signal