2006-2009 Suzuki LT-R450 Service Manual, Page 166Get this manual
FI SYSTEM DIAGNOSIS
Step (When indicating P0120-H:) 1) Turn the ignition switch OFF2) Remove the fuel tank cover(C:::::;=7-6) 3) Check the TP sensor coupler for loose or poor contactsIf OK, then check the TP sensor lead wire continuity
4) Disconnect the TP sensor coupler5) Check the continuity between Yellow wire
and Red wire
If the sound is not heard from the tester, the circuit condition isOK