Content Source: 2019 850 INDY XC Owner’s Manual (9929182 R01) > Features Chapter

IMPORTANT

The Owner's Manual for this vehicle contains warnings, instructions and other information you must read and fully understand before safely riding or performing maintenance on this vehicle.Always follow the warnings and instructions in Owner's Manual.

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Detonation Elimination Technology (DET)

When DET senses and takes action to reduce detonation, the driver may notice a drop in engine RPM and/or reduced performance.
The ECU will illuminate the check engine LED and display “DETONATION” on the LCD screen whenever the DET system is active.
If 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 clusters will display “DETONATION” and the ECU will either limit the maximum engine speed or turn off the engine.
If the ECU limits RPM, the limit will remain active until the driver stops and restarts the engine.

DETONATION PROTECTION MODES

Check Engine LED/Gauge Display

Protection Mode

LED illuminated / “DETONATION” displayed

Slight drop in engine RPM/power

LED flashing / “DETONATION” displayed

Exhaust valves close to reduce engine RPM/power. Restart engine to reset.
NOTE
The instrument cluster alert indicates which cylinder is experiencing detonation
NOTE
The most likely causes of severe detonation are outlined in the troubleshooting table below.

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