2009 Polaris Sportsman 850 XP EFI EPS Service Manual, Page 64Get this manual
ELECTRONIC FUEL INJECTION Verify TPS Tester Reference Voltage volt reference voltage signal from the TPS Tester harness is required for the TPS test to be accurateRefer to the instructions provided with the TPS Tester Kit (2201519) or follow the bullet point steps below to check reference voltageReference Voltage Test: Insert black voltmeter probe into the "Bk" test port Connect the red voltmeter probe into the "R" test port and verify the voltage is 4.99-5.01 VdcIf this reading is low, verify the volt battery is good or try new volt battery3
Checking TPS Reading
12Remove the seat and upper left-hand side panel (see Chapter "Seat and Side Panels")Assemble the TPS Tester according to the instructionsRefer to "TPS Tester Kit" for proper set-up and testingVerify the volt tester battery is newDisconnect vehicle harness from TPS