4.4
ELECTRONIC FUEL INJECTION
P
RELIMINARY
V
ERS
I
ON
Digital Wrench™ - Diagnostic Connector
Located under the dash and accessible from the passenger side.
Digital Wrench™ - Download Website
Located at: www.polaris.diagsys.com
Download Digital Wrench™ Updates:
IMPORTANT: For the most recent information on
Digital Wrench
™ software and update downloads
please visit the website: www.polaris.diagsys.com
Service Notes
• For more convenient and accurate testing of EFI
components, it is recommended dealers utilize the
Digital Wrench™ Diagnostic Software (dealer only), or
testing may be done manually using the procedures
provided.
• 80% of all EFI problems are caused by wiring
harness connections.
• For the purpose of troubleshooting difficult running
issues, a known-good ECU from another Polaris
RANGER RZR EFI of the same model may be used
without damaging system or engine components.
• Never attempt to service any fuel system component
while engine is running or ignition switch is "on."
• 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.
• 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.
• Clean any connector before opening to prevent dirt
from entering the system.
• Although every precaution has been taken to prevent
water intrusion failure, avoid direct water or spray
contact with system components.
• 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.
• Do not allow the battery cables to touch opposing
terminals. When connecting battery cables attach the
positive (red) cable to positive (+) battery 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 lead
before charging battery.
• Always unplug ECU from the wire harness before
performing any welding on the unit.
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