2010-2012 PRO-RIDE RUSH Switchback RMK Service Manual, Page 141Get this manual
Cleanfire Fuel Injection Detonation Protection (DET)RPM Limit
When DET is sensing and taking action to reduce detonation, the driver may notice drop in engine RPM andor reduced performanceThe ECU will illuminate the instrument cluster check engine LED and display "dET" on the LCD screen whenever the DET system is activeIf the ECU determines the detonation cannot be controlled by normal means and further operation may cause engine damage, the check engine LED will flash, the instrument cluster will display "dET", and the ECU will limit the maximum engine speed to 6,500 RPMThe RPM limit will remain active until the driver turns off and restarts the engineNOTE: DET Troubleshooting flowchart is located at the end of the chapterCAUSE OF DET ACTIVATION SOLUTION
Low fuelno fuel in tank
Refill tank with recommended fuel
Verify correct fuel selector Incorrect ethanolnon-ethanol resistor installed for fuel type in fuel resistor installed tank Replace with higher quality Poor quality fuelwater in fuel fuelRecommended 91 octane minimum Alcohol-based fuel additives used with ethanol fuel Restricted fuel filter Low fuel pressure Do not use deicers or additives that contain any form of alcohol when using ethanol-blended fuel Replace fuel filter Verify fuel pressure is 58 psi (4 BAR) at idle and while riding Verify fuel injection circuit is at 16 VDC when engine is running Use Digital Wrench to troubleshoot Verify valves are not stuck open, vent hoses are not frozen or plugged Verify knock sensor screw torque is set to specification Verify air intake system is sealedCheck throttle body boots for crackstearsloose partsRemove after-market air intake system