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Electric Scooter Repair Help > Throttle Testing Guide

 

Throttle Testing Guide

 

For Standard Electric Scooter, Bike, and Go-Kart Throttles

On Vehicle Throttle Test

The on vehicle throttle test is the preferred method because it tests both the controller and throttle. However if the controller has zero Volts of output to the throttle then the off vehicle throttle test shown below will be the only way to test the throttle.


Step 1

Test Throttle Output Voltage of Controller


Step 2

Test Signal Voltage of Throttle


The controller and throttle wire colors may be different than depicted above depending on the controller and throttle models. The most common throttle wire colors are listed below. If the controller or throttle wire colors are not listed below then refer to the controller and throttle wiring documentation or the vehicle’s wiring diagram if available.

How To Interpret The Test Results

If the controller does not have a 4.3 through 5 Volt output to the throttle then the controller or one of the parts connected to it such as the power switch, fuse or circuit breaker, wiring harness, connectors, brake switch, or battery pack is faulty.

 

If the controller has a 4.3 through 5 Volt output to the throttle and the throttle has a zero Volt output signal then the throttle, throttle cable, or throttle connector is faulty.

 

Off Vehicle Throttle Test

To test a throttle off of the vehicle a 4.5 through 5 Volt DC power source is required which could be a variable Voltage DC power supply, a 4.5 through 5 Volt DC wall mount power supply like the kind used for answering machines and calculators, or three 1.5 Volt batteries wired in series to produce a 4.5 Volt battery pack. Do not exceed 5 Volts DC of power to the throttle or else the hall effect chip inside of the throttle may burn out. Also be very careful to not apply reverse polarity, or apply power to the wrong wires of the throttle, because that will immediately burn out the hall effect chip inside of the throttle.

 

Working throttles have a power output roughly between 0.8 through 4.3 Volts DC. The output Voltage can be as low as 0.5V and as high as 5 Volts DC on a good working throttle. The speed controller will only read throttle output Voltages between 1-4 Volts DC so if the throttle Voltage is under or over 1-4 Volts DC that is normal and the throttle is good.

 

During the test slowly turn the throttle to full power and read the Voltage on the multimeter. The Voltage should react proportionally to the position of the throttle as it is being turned. A released throttle should have a low Voltage reading and a throttle in the full throttle position should have a high Voltage reading.

How To Interpret The Test Results

If the throttle has around 0.8 through 4.3 Volts of output signal Voltage it is working. If it has zero Volts of output signal then it is faulty.


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