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FUEL SYSTEM / FUEL INJECTION
4.3
Service Notes:
G For more convenient and
accurate testing of EFI
components, it is recommended
dealers utilize the Polaris
Diagnostic Software (dealer only),
or testing may be done manually
using the procedures provided.
G 80% of all EFI problems are
caused by wiring harness
connections.
G For the purpose of troubleshooting
difficult running issues, a known--good
ECU from another Polaris ATV EFI
may be used without damaging
system or engine components.
G Always depressurize the fuel system
through the fuel rail test valve before
disconnecting or servicing any EFl
system components.
G Never attempt to service any fuel
system component while engine is
running or ignition switch is ”on.”
G Cleanliness is essential and must be
maintained at all times when
servicing or working on the EFI
system. Dirt, even in small
quantities, can cause significant
problems.
G Do not use compressed air if the
system is open. Cover any parts
removed and wrap any open joints
with plastic if they will remain open
for any length of time. New parts
should be removed from their
protective packaging just prior to
installation.
G Clean any connector before opening
to prevent dirt from entering the
system.
G Although every precaution has been
taken to prevent water intrusion
failure, avoid direct water or spray
contact with system components.
G Do not disconnect or reconnect the
wiring harness connector to the
control unit or any individual
components with the ignition ”on.”
This can send a damaging voltage
spike through the ECU
G Do not allow the battery cables to
touch opposing terminals. When
connecting battery cables attach the
positive (+) cable to positive (+)
battery terminal first, followed by
negative (--) cable to negative (--)
battery terminal.
G Never start the engine when the
cables are loose or poorly connected
to the battery terminals.
G Never disconnect battery while
engine is running.
G Never use a quick--start battery
charger to start the engine.
G Do not charge battery with key switch
”on.”
G Always disconnect negative (--)
battery cable lead before charging
battery.
G Always unplug ECU from the wire
harness before performing any
welding on the ATV.