4.4
ELECTRONIC FUEL INJECTION
9923523 - 2012 RANGER RZR 570 Service Manual
© Copyright 2011 Polaris Sales Inc.
Service Notes
• For m ore co nvenient a nd a ccurate testing of EF I
components, it is recommended dealers utilize the
Digital W renchâ„¢ Diag nostic Sof tware ( dealer
only), or testing may b e done manually using the
procedures provided.
• 80
% o f al l EF I pro blems a re c aused by wi ring
harness connections.
• For the purpose of troubleshooting difficult running
is
sues, a kn own-good ECU fr om an other
RANGER RZR 5 70 of the same model and year
may be used without damaging system or engine
components.
• Never at tempt to serv ice any fuel sys tem
co
mponent while en gine is r unning or ig nition
switch is "on."
• Cleanliness is essential and must be maintained at
all tim
es when ser vicing or working o n th e EFI
system. Dirt , even in sm all qu antities, can cause
significant problems.
• Do not use comp ressed air if the system is open.
Co
ver any p arts r emoved a nd wra p a ny op en
joints w ith plas tic if they will remain open for any
length of time. New parts should be removed from
their protective packaging just prior to installation.
• Clean any connector before opening to prevent dirt
fr
om entering the system.
• Although ever y pr ecaution has b een t aken to
pre
vent wa ter intru sion fa ilure, avoid dir ect water
or spray contact with system components.
• Do not disconnect or reconnect the wiring harness
c
onnector to th e c ontrol u nit or an y in dividual
components with the ignition "on." This can send a
damaging voltage spike through the ECU.
• Do not allow the battery cables to touch opposing
te
rminals. W hen connecting battery cables attach
the positiv e (red) cable to posit ive (+) batt ery
terminal first, followed by negative (black) cable to
negative (-) battery terminal.
• Never start the engine when the cables are loose
or
poorly connected to the battery terminals.
• Never disconnect battery while engine is running.
• Never use a battery boost-pack to start the engine.
• Do not charge battery with key switch "on."
• Always disconnect negative ( -) battery cable lea d
b
efore charging battery.
• Always unplug ECU fr om the wire harness before
performing any welding on the unit.
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