Polaris FST Touring - Manual (Page 39)

36
FEATURES
Detonation Elimination Technology (DET)
(Turbo Models)
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.
NOTE: Engine performance will be reduced if fuel with a lower
octane than 91 is used. See fuel recommendations on
page 79.
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 illuminate if the sensor fails or
becomes disconnected.