2012 Sportsman 400/500 and EFI Tractor Service Manual 9923412, Page 156Get this manual
500 EFI FUEL SYSTEM 3If the pump did not activate (Step 2), disconnect the plug from the fuel pumpConnect DC voltmeter across terminals "A" and "C" in the plug, turn on the key switch and observe if minimum of volts is presentIf voltage is between and 14, turn key switch off and connect an ohmmeter between the terminals "A" and "C"' on the pump to check for continuityNOTE: If there was no continuity between the pump terminals, replace the fuel pump assemblyNOTE: If the voltage is below 7Vdc, test the battery, ignition switch, wiring harness and ECU4If voltage at the plug was good, and there was continuity across the pump terminals, reconnect the plug to the pump, making sure you have good, clean connectionsTurn on the key switch and listen for the pump to activateNOTE: If the pump starts, repeat steps and to verify correct pressureNOTE: If the pump still does not operate, check for correct ECU operation by plugging in known-good ECUNOTE: If the pump still does not operate, replace the fuel pump assembly