2006 Ski Doo REV Service Shop Manual, Page 237Get this manual
Section 05 ENGINE MANAGEMENT (POWER TEK) Subsection 03 (COMPONENT INSPECTION, REPLACEMENT AND ADJUSTMENT)
Ensure pressure orifice is free of snow, ice and dirtTemporarily remove the orifice filter and clean the areaCheck for fault codes in B.U.D.SIf sensor does not work replace ECM
Disconnect connector DA form the ECM and check continuity of circuit as per following table17 32
KNOCK SENSOR (KS)
A34E0LB
ECM CONNECTOR
CIRCUIT NUMBER (ECM connector)
A33C53A