Troubleshooting VEX IQ Smart Motors

The following list provides scenarios for troubleshooting a Smart Motor:

The Smart Motor turns when it should not turn or the Smart Motor turns in the wrong direction.

  • Start by pairing the VEX IQ Robot Brain with the VEX IQ Controller and running the Driver Control program.
  • Click here to review the proper configuration included in “How to Use the Driver Control Program” and check that the Smart Motor is wired to the correct Smart Port.
  • If the Smart Motor turns when the Controller is not being pressed, try calibrating the Controller.
  • If the Smart Motor turns in the wrong direction, check whether the configuration of the Smart Motor should or should not be Reversed.  
  • If running a user program, check the program for possible errors that might cause the Smart Motor to move incorrectly.

The Smart Motor does not move at all.

  • Check that the Smart Cables’ connectors are fully seated (inserted) by pressing until an audible click is heard.
  • Try replacing the Smart Cables with new ones.

The Smart Motor is properly connected but now there is an error message.

The Smart Motor is detected as a Bumper Switch

  • Try replacing the Smart Cable with a new one.
  • Check the Smart Port on the Smart Motor for bent pins or debris.
  • Check the Smart Port on the Robot Brain for bent pins or debris.

Note: The Bumper Switch is a completely passive device, if the Robot Brain does not find a smart device like a motor, it checks to see if a Bumper Switch is present by measuring the resistance of certain pins in the Smart Port connection. If there is a problem with the connection of the Smart Port pins of the Smart Motor, it may show up as a Bumper Switch.

For more information, help, and tips, check out the many resources at VEX Professional Development Plus

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