Polaris 900 RMK - Manual (Page 34)

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FEATURES
Detonation Elimination Technology (D.E.T.)
A detonation sensor monitors the engine and responds to detonation by
automatically reducing the engine timing and adding fuel. This results
in decreased engine RPM and performance.
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 Solution
Poor quality fuel Replace with higher quality fuel
Improper engine modifications Do not modify the engine
Effect of DET
The DET system prevents damage to the engine from detonation while
developing the maximum power of the engine safely. If the system
senses detonation beyond a preset limit, it retards ignition timing and
adds fuel to reduce the detonation and prevent engine damage.
When the detonation returns to a permissible level, the system will
return spark and fuel to normal, allowing the engine to run at rated
power levels.
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 check engine light will flash six times if the sensor fails
or becomes disconnected.