2009 Suzuki 400 LTZ Quad Sport Service Manual, Page 128Get this manual
Engine General Information and Diagnosis: C41 (Use of mode select switch) Step Action 1) Turn the ignition switch to OFF 1A-64
Yes No FP relay (ECM) Open or short circuit in malfunctionthe red wire2) Remove the headlightRefer to "Headlight Removal and Installation in Section 9B (Page 9B-2)" OW or RB wire open or shorted, or poor 3) Check the ECM coupler for loose or poor contactsterminal "14" or "15" If OK, then measure the FP relay input voltageconnection If the wire and connection are OKintermittent trouble or faulty ECM Recheck each terminal and wire harness for open circuit and poor connectionI933H1110069-01