4.4
9850064 R03 - 2021 650 / 850 Matryx Trail Performance / Crossover Snowmobile Service Manual
© Copyright Polaris Inc.
DETONATION (DET) PROTECTION MODES
When the Detonation Elimination Technology (DET) in the ECU is sensing and taking action to reduce detonation, the
driver may notice a drop in engine RPM and / or reduced performance.
The ECU will illuminate the instrument cluster check engine LED and display “DET” or “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 cluster will display “DET” or “DETONATION”, and the ECU
will either limit the maximum engine speed or shut-off the engine. If the ECU limits RPM, the limit will remain active
until the driver turns off and restarts the engine.
MODEL
CHECK ENGINE LED / GAUGE
DISPLAY
PROTECTION MODE
650 / 850 Models
Check engine LED illuminated /
“DET” or “DETONATION” displayed
Driver may notice slight drop in
engine RPM / power
Check engine LED flashing / “DET” or
“DETONATION” displayed
Exhaust valves closed to reduce
engine RPM / power. Re-start engine
to reset.
Standard Gauge
7S Display
