2009 Suzuki 400 LTZ Quad Sport Service Manual, Page 95Get this manual
1A-31 Engine General Information and Diagnosis: Step Action 1) Correct the ECM coupler2) Turn the ignition switch ON3) Measure the input voltage between the wire and groundIf OK, the measure the input voltage between the wire and BBr wireSpecial tool (A): 0990025008 (Multi-circuit tester set) (B): 0990025009 (Needle pointed probe set) Tester knob indication Voltage) TP sensor input voltage 4.5 5.5 ((+) terminal: () terminal: Ground, (+) terminal: () terminal: BBr) (A)
Yes Go to Step 3
No Open or short circuit in the wire or BBr wire