2004 Ski-Doo REV Series Factory Service Manual, Page 192Get this manual
Section 05 2TEC ENGINE MANAGEMENT Subsection 01 (OVERVIEW)
This engine management system controls the fuel injection, the ignition timing and the electronically controlled RAVEAs shown in the SDI CONTROL SYSTEM illustration, the ECM is the central point of the fuel injection systemIt reads the inputs, makes computations, uses pre-determined parameters and sends the proper signals to the outputs for proper engine managementThe ECM also stores the fault codes and general information such as: operating conditions, vehicle hours, serial numbers, customer and maintenance information
NOTE: An electric heating element has been added to the RAVE solenoid to ensure proper function in very cold weather
KNOCK SENSOR
A knock sensor is mounted on top of the cylinder headIt detects specific vibration that would be typically generated by engine detonationIf detonation occurs, the knock sensor detects it and the ECMs retards the ignition advance and extend the injection period temporarily (it goes in specific mode) until detonation stops