2009 Suzuki 400 LTZ Quad Sport Service Manual, Page 92Get this manual
Engine General Information and Diagnosis: P0120-H (Use of SDS) Step Action 1) Turn the ignition switch OFF2) Remove the fuel pump mounting bolts and move the fuel pumpRefer to "TP Sensor Removal and Installation in Section 1C (Page 1C-3)"3) Check the TP sensor coupler for loose or poor contactsIf OK, then check the TP sensor lead wire continuityYes Go to Step 2 1A-28