2009 Suzuki 400 LTZ Quad Sport Service Manual, Page 105Get this manual
1A-41 Engine General Information and Diagnosis: Troubleshooting! CAUTION
When using the multi-circuit tester, do not strongly touch the terminal of the ECM coupler with needle pointed tester probe to prevent the terminal damage or terminal bendNOTE After repairing the trouble, clear the DTC using SDS toolRefer to "Use of SDS Diagnosis Reset Procedures (Page 1A-12)"C17 (Use of mode select switch) Step Action 1) Turn the ignition switch OFF2) Check the IAP sensor coupler for loose or poor contactsIf OK, then measure the IAP sensor input voltageYes Go to Step 3No Loose or poor contacts on the ECM coupler Open or short circuit in the wire or BBr wire