E-TEC Atmospheric Pressure Sensor (APS)

One of the sensors used by the Ski-Doo E-TEC direct fuel injection system is an atmospheric pressure sensor, or air pressure sensor. The air pressure is used by the ECM computer module to calculate the proper amount for fuel needed for the conditions (in addition to many other sensors).

The air pressure sensor on an E-TEC is built into the ECM module, and an air hose runs from the ECM to the air box. The sensor is calibrated to detect the pressure of the air box, so if this hose is disconnected, kinked or obstructed the proper air pressure will not be detected and the machine can exhibit poor performance and/or poor fuel economy. On any E-TEC machine that is not running properly, this air hose should be inspected for proper routing to ensure there are no obstructions or kinks in the hose, and that it is connected. This applies to all 600 and 800 E-TEC engine packages, all models.

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