2006-2009 Suzuki LT-R450 Service Manual, Page 179Get this manual
FI SYSTEM DIAGNOSIS
Step (When indicating P1651-H:) 1) Turn the ignition switch OFF2) Remove the front fender(C7'7 -6) 3) Check the TO sensor coupler for loose or poor contacts If OK, then check the TO sensor lead wire continuity
4) Disconnect the TO sensor coupler5) Check the continuity between Red wire
and BrW wire If the sound is not heard from the tester, the circuit condition is OK