2012 Sportsman 400/500 and EFI Tractor Service Manual 9923412, Page 147Get this manual

2012 Sportsman 400/500 and EFI Tractor Service Manual 9923412, Page 147

500 EFI FUEL SYSTEM EFI SERVICE NOTES General Service Information For more convenient and accurate testing of EFI components,
is dictated (including thorough inspection of the ECU connector for contamination or damage)6If the sensor passes and the
wiring passes inspection, and reconnecting the ECU does not resolve the issue, then at that point known-good ECU (from another
500 EFI ATV) could be connected and tested for problem resolution For the purpose of troubleshooting difficult running issues,
known-good ECU from same-model Polaris 500 ATV EFI system may be used without damaging system or engine components Do not
use dielectric grease on sealed connectors (connectors with rubber grommet), as it may displace the rubber seal and allow
contaminants to enter the connector Never attempt to service any fuel system component while engine is running or ignition
switch is turned to "on" USE CARE when removing or installing the ECU connector, as well as all other harness connections
on the ATVDirt, even in small quantities, can cause significant problemsClean connectors thoroughly before opening to prevent