Control functions18ESU10511Coolant temperature warningindicator “ ”If the engine overheats, the coolant tempera-ture warning indicator and the warning lightcome on. When this occurs, stop the engineimmediately and allow the engine to cooldown, and then check the coolant level in thecoolant reservoir. (See page 53 for checkingprocedures.)CAUTION:ECS00040Do not operate the engine if it overheats.ESU12680Self-diagnosis deviceThis model is equipped with a self-diagnosisdevice for various electrical circuits.If any of those circuits are defective, the warn-ing light and the self-diagnosis warning indi-cator will flash, and a two-digit error code willflash slowly in the tripmeter/odometer display.WARNINGEWS00650If the self-diagnosis warning indicator andwarning light flash continuously, and anerror code is displayed during operation,there may be some problem with an elec-trical circuit, couplers, etc.Note the error code, and then have aYamaha dealer inspect the snowmobile assoon as possible in order to avoid enginedamage.ESU10530Engine stop switch “ ”The engine stop switch is used to stop the en-gine in an emergency. Simply push the stopswitch to stop the engine. To start the engine,pull the stop switch and proceed with startingthe engine. (See pages 31 for engine startingprocedures.)1. Coolant temperature warning indicator “ ”2. Warning light “ ”1. Warning light “ ”2. Self-diagnosis warning indicator “ ”3. Two-digit error code