2009 Suzuki 400 LTZ Quad Sport Service Manual, Page 97Get this manual
1A-33 Engine General Information and Diagnosis: Step Action 1) Connect the test harness to TP sensor couplerYes Y, or BBr wire open or shorted to 2) Turn the ignition switch ONground, or poor "5", 3) Measure the TP sensor output voltage at the coupler "13" or "24" (between terminal "A" (Y wire) (+) and terminal "C" (BBr connectionwire) ()) by opening the throttle lever If wire and Special tool connection are OK, (A): 0990025008 (Multi-circuit tester set) intermittent trouble or (C): 0990028630 (TPS test wire harness) faulty ECMTester knob indication Recheck each Voltage) terminal and wire harness for open TP sensor output voltage circuit and poor Throttle valve is closed: Approx0.6 connectionThrottle valve is opened: Approx3.8 ((+) terminal: () terminal: BBr) Replace the ECM with known good one, and inspect it againRefer to "ECM Removal and Installation in Section 1C (Page 1C-2)"No If check result is not satisfactory, replace TP sensor with new oneRefer to "Throttle Body Disassembly and Assembly in Section 1D (Page 1D-10)" (A)