2006-2009 Suzuki LT-R450 Service Manual, Page 172Get this manual
FI SYSTEM DIAGNOSIS
Step (When indicating P0115-L:) 1) Turn the ignition switch OFF2) Check the ECT sensor coupler for loose or poor contactsIf OK, then measure the output voltage
3) Disconnect the ECT sensor coupler4) Check the continuity between BBI wire and groundIf the sound is not heard from the tester, the circuit condition isOKTester knob indication: Continuity test (-II)