Speed Sensor Testing and Adjustment for Nautilus SC916 Stepper

A maladjusted or faulty speed sensor on your Nautilus SC916 can cause no power to the console and in turn, no resistance in the pedals. We discuss the steps necessary for testing and adjustment of the speed sensor on your SC916.

A common misconception about battery-powered units, is that it only requires you to step on the pedals to power the console; when in fact the speed sensor plays a major role in powering the console.

If you step on the pedals of your Nautilus SC916 stepper and they fall to the floor due to the console not powering up so there is no resistance, you should check the speed sensor.

Tools Needed:

  • Voltmeter
  • 7/16" Wrench


The speed sensor, mounted to the alternator, reads the speed sensor disc when the unit is pedaled producing an AC voltage.

The voltage from the speed sensor can be tested at the connection of the speed sensor to the lower control board. The connection is a red and black wire. 

  1. Using AC setting on your voltmeter at its lowest range, place the red lead to the red wire and the black lead to the black wire.
  2. Make sure the leads of the voltmeter are making a good connection.
  3. Now step on the unit and verify the voltage from the speed sensor.
    1. A good speed sensor will produce about 3 VAC before the console powers up.
      1. If the voltage is not correct, inspect the adjustment of the speed sensor. It may be necessary to adjust the sensor closer to the speed sensor disc.
        1. The proper gap of the speed sensor to the disc is about the thickness of a business card.
    2. Retest unit after making speed sensor adjustment.
Was this article helpful?
0 out of 0 found this helpful



Please sign in to leave a comment.

Articles in this section

Customer Service Hours:
8:00am - 5:00pm CST Monday to Friday