2009 Suzuki 400 LTZ Quad Sport Service Manual, Page 106Get this manual
Engine General Information and Diagnosis: 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 3 1A-42
No GB wire shorted to VCC, or BBr wire open
I933H1110027-01
3) Disconnect the IAP sensor coupler4) Check the continuity between the wire and GB 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)