Polaris 600 RMK Owner's Manual page 32

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
sensor 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
prevent detonation.
When the DET system is adjusting the timing, the DET light on the
gauge 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 DET light will remain on until the engine is turned
off and restarted.
DET Troubleshooting
Use this chart to determine causes and solutions for detonation. If
none of these conditions exists and the sensor remains activated, see
your Polaris dealer for diagnosis.
Possible Cause
Poor quality fuel
Improper engine modifications
Improper jetting
Sensor Fail-Safe
The DET includes a sensor fail-safe system to prevent the engine from
damage if the sensor fails, becomes disconnected or is unable to detect
detonation. The rider will experience a loss in power. The sensor must
be reconnected or repaired to regain full power.
NOTE: The DET light will flash six times if the sensor fails or
becomes disconnected.
Solution
Replace with higher quality fuel
Do not modify the engine
Use the correct jetting for your altitude
FEATURES
29