2009 Suzuki 400 LTZ Quad Sport Service Manual, Page 91Get this manual
1A-27 Engine General Information and Diagnosis: C14 (Use of mode select switch) 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 input voltageYes Go to Step 3No Loose or poor contacts on the ECM coupler Open or short circuit in the wire or BBr wire I933H1110018-01