2009 Suzuki 400 LTZ Quad Sport Service Manual, Page 103Get this manual
1A-39 Engine General Information and Diagnosis: Step Action 1) Turn the ignition switch OFF2) Connect the ECM coupler and disconnect the ECT sensor couplerYes BBl or BBr wire open or shorted to ground, or poor "22" or "24" connectionNo Replace the ECT sensor with new oneRefer to "ECT Sensor Removal and Installation in Section 1C (Page 1C-5)" 3) Remove the fuel pump mounting bolts and move the fuel pumpRefer to "TP Sensor Removal and Installation in If wire and connection are OK, Section 1C (Page 1C-3)"intermittent trouble or 4) Measure the ECT sensor resistanceRefer to "ECT faulty ECMSensor Inspection in Section 1C (Page 1C-6)" for Recheck each detailsterminal and wire Special tool harness for open (A): 0990025008 (Multi-circuit tester set) circuit and poor connectionTester knob indication Resistance) Replace the ECM ECT sensor resistance Approx 2.6 at 20 (68 F) (Terminal Terminal) with known good one, and inspect it againRefer to "ECM Removal and Installation in Section 1C (Page 1C-2)"