2003 Polaris Deep Snow Snowmobiles Service Manual, Page 323Get this manual
ELECTRICAL Effect of Detonation System
Basic concept of the detonation system is to avoid damage to the engine from detonation while developing the maximum power of the engine safelyS The system starts with predetermined maximum timing curveIf the system senses detonation that is beyond preset limit, the system retards the ignition timing to reduce the detonation and prevent engine damageA light on the dash will flash while the system is in this detonation compensation modeWhen the detonation returns to permissible level, the system will incrementally advance the spark to increase the output of the engine in safe manner
Sensor Failsafe