Polaris 600 HO IQ - Manual (Page 33)

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FEATURES
Detonation Elimination Technology (D.E.T.)
The DET system prevents damage to the engine from detonation while
developing the maximum power of the engine safely. A detonation sen-
sor monitors the engine and responds to detonation by automatically
reducing the engine timing. This can result in decreased engine RPM
and performance.
The engine is designed to provide maximum power when premium (91
octane) fuel is used. If a lower octane fuel is used, or if the jetting is
incorrect for your altitude, the DET system will retard ignition to pre-
vent detonation.
When the DET system is adjusting the timing, the CHECK ENGINE
light will flash. In most cases the flashing will be temporary and the
timing will return to normal. If there is intermittent flashing, it’s likely
that the fuel or jetting is incorrect.
In extreme conditions the DET system retards timing and holds it in a
retarded state. The CHECK ENGINE light will remain on until the
engine is turned off and restarted.