|These steps are only applicable to universal Hall Effect 3- or 4-wire throttle controls, not branded throttles from Razor or Currie Technologies, or throttle potentiometers for mobility products. We do not currently have information on diagnostics for other kinds of throttles.|
This guide assumes that the battery pack and control module have already been tested and eliminated as the problem. You will need to complete the Battery Troubleshooting Guide and the Controller Troubleshooting Guide prior to using this guide.
Visually Inspect the Hall-Effect ThrottleInspect the throttle for signs of damage or neglect. Make sure to give the throttle a full turn. Depending on the nature of the damage, it may still be possible to use a damaged throttle control. However, this is not recommended.
Signs of damage may include:
• Frayed, cut, or melted wiring connections.
• Abnormal resistance when turning the throttle.
• Abnormal grinding or scraping sounds when turning the throttle.
• Throttle does not return to "off" position automatically.
• Rust on the exterior or interior.
Be very careful to avoid connecting the throttle or controller wires directly as this may damage or destroy the electrical component. As with any wiring work that deals with live electrical currents, it is not recommend to complete the remainder of this troubleshooting guide without the assistance of a professional. Serious injury may result if the correct precautions are not taken.
Test the Hall-Effect ThrottleVerify the throttle output varies correctly while throttling. This can be tested with any standard multimeter or voltmeter, and a 5 volt power source. All universal speed and voltage controllers sold by Monster Scooter Parts output 5 volts at the throttle connection, as long as they are connected to a good battery and the power is "on".
Follow these steps to test the throttle:
Set the multimeter or voltmeter to the direct current (DC) voltage setting.
Connect the red cable on the multimeter or voltmeter to the positive wire (red wire) on the controller, and the black cable to the negative/ground wire (black or yellow wire) on the controller.
Check the voltage on the meter. If the voltage reading is between 4 and 6 volts, then the controller is ready to test the throttle. Otherwise, please complete the Controller Troubleshooting Guide prior to continuing this guide.
Connect the positive wire of the throttle to the positive wire on the controller or power source. Normally this wire is red on the throttle.
Connect the negative/ground wire of the throttle to the negative/ground wire on the controller or power source. This wire may be black or blue on the throttle.
Set the multimeter or voltmeter to the direct current (DC) voltage setting. Connect the positive cable on the meter to the variable speed wire on the throttle (usually this wire is green) and the negative cable to the ground wire in step 5.
Note the voltage reading on the meter while engaging the throttle. In normal operation, the voltage reading will be at approximately 1 volt when not throttling and rise to approximately 5 volts when fully throttled. If the throttle behaves as described, it is not defective and does not need to be replaced.
If the voltage reading remains constant while throttling, you may have the ground and variable wires in the incorrect position. Reverse these and complete steps 6 and 7 again. If the voltage still does not change, the throttle is defective and should be replaced.
ConclusionIf your throttle passes the above tests, then you do not have any problem with that hall-effect throttle. You may have a problem elsewhere in your application. If you are convinced it is a control issue, you may have a problem with the motor or controller.
For further assist troubleshooting your electric scooter, click here to return to our electric scooter troubleshooting guides.