2009 Suzuki 400 LTZ Quad Sport Service Manual, Page 107Get this manual
1A-43 Engine General Information and Diagnosis: P0105-L for IAP sensor (Use of SDS) Step Action 1) Turn the ignition switch OFF2) Check the IAP sensor coupler for loose or poor contactsIf OK, then check the IAP sensor lead wire continuityYes Go to Step 2No and GB wire open, G wire shorted to the ground I933H1110027-01
3) Disconnect the IAP sensor coupler4) Check the continuity between the GB wire and groundAlso, check the continuity between the GB wire and B Br wireIf the sound is not heard from the tester, the circuit condition is OKSpecial tool (A): 0990025008 (Multi-circuit tester set) (B): 0990025009 (Needle pointed probe set) Tester knob indication Continuity)