2005 Ski-Doo RT Series Shop Manual, Page 140Get this manual
Section 04 ENGINE MANAGEMENT (SDI) Subsection 01 (OVERVIEW)
NOTE: Sensor failures will not lead automatically to limp home modeThe check engine LED will turn on and in some cases the beeperThe engine RPM may be limited if some critical components failIn this case, releasing throttle and letting the engine returning to idle speed may allow normal operation to come backIf it does not work, try removing and reinstalling the tether cord cap on DESS postThese performance-reduced modes allow the rider to go back home which would not be possible without this advanced systemRefer to the DIAGNOSTIC PROCEDURES for complete chart