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QS-S4 LCD Throttle Guide

This QS-S4 throttle guide explains the most complete manuals and covers everything from technical details to settings to troubleshooting, error codes and diagnostic steps. The (finger) trigger throttle is the most common throttle installed on electric scooters and is especially prevalent among high performance electric scooters. All of the established brands like Apollo, Turbowheel, Zero as well as Kaabo and Minimotors scooters use a variant of the finger trigger throttle.

QS-S4 LCD Throttle

This LCD throttle interfaces with the controller and battery and should not to be confused with being a controller itself — a beefier component buried deeper with the electric scooter. The QS-S4 provides a readout of speed, odometer, trip, mode, and battery remaining.

It features buttons that allow you to power your scooter on, control the lights, and adjust a cryptic list of electric scooter settings known as  p-settings  or program settings.

These settings dictate everything from regenerative braking strength to max throttle power to motor pole configuration. If you’re looking for specific settings for your electric scooter, see our database of electric scooter P-SETTINGS.

The QS-S4 LCD has superseded older versions of the unit, including the TF-100 and LF-100 finger throttles; 
in most cases the QS-S4 is not interchangeable with these models, but this will depend on your electric scooter model.

QS-S4 thumb throttle

Though the most common variant of the QS-S4 is the trigger or finger throttle, QS-S4 also comes as a thumb style throttle or can be modified to be controlled by thumb throttle. Some retailers offer the thumb throttle as an upgrade that must be professionally installed by disassembling and soldering new connections onto the original throttle. There are also QS-S4 versions that come as a thumb-throttle direct from the factory.

The QS-S4 thumb-controlled throttle offers advantages in terms of comfort and controller over the standard trigger throttle. If you have a QS-S4 trigger throttle, you can fairly easily swap it out for a thumb throttle — especially if you have a newer version that uses plug and play connectors.

Features

The QS-S4 features a large, back-lit (typically color) acrylic-covered LCD, two buttons (mode and power), and a trigger-style throttle. The trigger throttle works well, but we and others have noted that it’s not the most comfortable for longer trips due to the very stretched out position it puts your finger in.

EY3 (EYE3) THROTTLE

QS-S4 THROTTLE

Display color

Backlit green/blue with 1-color

Backlit display with 5-color

Waterproof

No

Yes

USB port

No

Yes

All versions of the QS-S4 use a 5- or 6-pin connector that communicates with the controller via the UART protocol over TX and RX lines.

USB port

The QS-S4 also features a USB port that can supply 5V at around 500 mA to 1000 mA of current. It’s primarily intended for flashing the unit, but it could potentially be used for charging USB accessories though we don’t advise it. The PCB is not robustly designed and current-thirsty USB devices risk frying your throttle unit.

Power button usage

The display (and scooter) can be powered on or off by pressing and holding down the red power button. 

Odometer and trip

Once the unit is powered on, you can toggle through the odometer, trip, and voltage settings by quick-pressing power button.

Adjusting speed mode or gear

The QS-S4 offers a “mode” button, which is sometimes referred to as gear.  This basically allows you to restrict the top speed of the scooter by putting it in a lower mode.  This is not the only setting that will affect scooter performance.  If you are trying to get the most performance out of your scooter, you’ll have to max out P-settings, which are buried deeper.

This will effect the top speed of your scooter. The gears range from 1 to 3, 3 being the fastest mode. You can toggle through modes by simply clicking the “mode” button. When you power off the scooter, it defaults back to mode 1.

  1. Power on your scooter.

  2. Hold the Mode + Power buttons (3-5 seconds) to access the P-setting menu.

  3. Use the Mode button to toggle through P-settings.

  4. Press the Power button to select the P-setting to adjust.

  5. Press Mode button to increase the value, and Power button to decrease the value.

  6. To save settings, allow the LCD display to timeout (3-5 seconds) or long press Mode + Power buttons to exit the menu.

QS-S4 settings explained

The QS-S4 is designed in such a way to be compatible with a wide range of electric scooters (and even e-bikes) that operate on different voltages (36V 48V 52V 60V 72V Model range), with different motors and tire sizes (among other things).

For specific settings for ZERO and KAABO electric scooters (including factory default), lookup for new blog SPECIFIC LCD SETTINGS.

settings on any ZERO model

P 01

LCD BRIGHTNESS

This setting adjusts your LCD brightness. The options are 1 through 3 with 3 being the brightest. The brightness of the LCD has insignificant effect on battery life. We recommend 3 because it’s easier to see in bright conditions.

P 02

MILAGE

You can choose between miles and kilometers. 

P 03

VOLTAGE

This displays the voltage. Dependent on the scooter.

P 04

AUTO SHUT OFF

This allows you to choose (in minutes) when you’re scooter will automatically shut off due to inactivity.

P 05

UNUSED

P 06

WHEEL DIAMETER

This simply displays the wheel diameter.

P 07

MAGNETS

This simply displays the number of magnets on the motor. We recommend NOT CHANGING this setting.

P 08

POWER LIMIT

This allows the user to choose the power limit of their scooter. The options are 1-100 with 100 being maximum power. WARNING! DO NOT hit mode on this setting if you do not plan on changing the power level. It will put you down to 001, and in order to get back to 100, you’ll need to press the button 99 times. No one wants to do that.

P 09

KICKSTART

When disabled, the scooter must be rolling a low speed before the motor will activate. Here you can choose between kickstart or zero start. We recommend kickstart. It can be dangerous if you have zero start enabled and you accidentally hit the throttle or if the throttle gets caught on something.

P 10

UNUSED

P 11

ELECTRONIC BREAKING 

This allows users to choose the intensity of the electronic breaking. The options are 1 through 5 with 5 being the strongest. We recommend 3 for the smoothest deceleration.

P 12

ACCELERATION

This allows users to choose the intensity of acceleration. The options are 1 through 5 with 5 being the quickest acceleration. We recommend 3.

P 13

UNUSED

P 14

UNUSED

P 15

CUTOFF VOLTAGE

We recommend not changing this setting because it has a large effect on battery health.

P 16

ODOMETER RESET

This allows users to reset their odometer. This only works with low milage scooters. You will not be able to zero the odometer if you’re over a few miles.

P 17

CRUISE CONTROL

This allows users to toggle cruise control on or off; 00 is cruise control off; 01 is cruise control on.
With cruise control on, it will be triggered if the user maintains a speed and throttle for approximately 10 seconds, it will keep the speed until the user hits the break or throttle again. We recommend keeping this off if you’re not an advanced rider.

P 18

UNUSED

P 19

UNUSED

P 20

UNUSED

specific LCD settings for your electric scooter

ZERO 8 | ZERO 8PRO | ZERO 8X | ZERO 9 | ZERO 10X 52V| ZERO 10X 60V

MANTIS 10 SWISS | MANTIS 10 SWISS+

QS-S4 Error Codes and Diagnostic Steps

When the LCD display controller detects an error, you’ll get the triangle + exclamation symbol and it will display the fault code just above the battery life display. The table below lists all error codes and their meaning.

ERROR

MEANING

TROUBLESHOOT ERROR CODES

02

Brake sensor

The brake error code commonly occurs when the regenerative braking switch built into your brake lever either becomes stuck or disconnected. Check the switch to make sure it is operating correctly and is not stuck. This issue is commonly accompanied by the symptom that the scooter will not accelerate when squeezing down the throttle — this is because the motor cutoff is being enabled via this switch.

Diagnostic Step

Check brake lever on handlebar and see if brake spring all the way back; Give the brake lever a few hard presses to ensure that it is not stuck. If jammed, then unclog the source of the jam. 
Check brake caliper to see if the brake line is springing back to original position. Also check brake hose to see if it is jammed. If brake caliper is not springing back, spray some Wd40 to make sure it springs back to original position.

06

Battery under-voltage

Battery has been discharged below the acceptable voltage threshold. The cause could be the scooter has been sitting around too long and discharged below the threshold or the undervoltage threshold has been set too low. You can look up the correct undervoltage settings for your scooter in our settings database.

Diagnostic Step

Check LCD setting P03 and P15; Give battery a full charge to see if issue persist. PO3 Should be in accordance to the voltage specified in the user manual. P15 should be the specified voltage – 6V.

07

Motor fault

7 and 8 error codes will be triggered when there is a problem with either the hall sensor (which senses motor speed) or power connection to the motor itself.

Diagnostic Step

Unplug and plug motor connector back to see if issue persist; If problem is resolved, then make sure connector is pushed all the way.
If issue persists check motor wire and connector pins to see if there are any issues. Either replace the motor or replace motor wire

08

Turnstile Fault

7 and 8 error codes will be triggered when there is a problem with LCD/throttle.

Diagnostic Step

Check if back screw of magnet has come loose in the throttle/LCD. Tighten back screw or replace magnet in throttle.

09

Controller fault

Error 9, 10 and 11 are all related to the controller and communication. If you’re getting this immediately after powering your scooter on you might have to wait a bit for communication to be established and it should go away.

Diagnostic Step

If it persists, then make sure the QS-S4 is properly connected to the controller. If you have a plug and play style connector, check it and try disconnecting/reconnecting. If issue persists replace controller.

10

Communication receiving fault

Error 9, 10 and 11 are all related to the controller and communication. If you’re getting this immediately after powering your scooter on you might have to wait a bit for communication to be established and it should go away.

Diagnostic Step

If it persists, then make sure the QS-S4 is properly connected to the controller. If you have a plug and play style connector, check it and try disconnecting/reconnecting. If issue persists unplug and plug in LCD connector and see if issue persists; if issue persists, than wiggle the LCD wire in different directions to see is problem persists. Change of wiring hardness from LCD to controller if the issue persists. 

11

Communication transmission fault

Error 9, 10 and 11 are all related to the controller and communication. If you’re getting this immediately after powering your scooter on you might have to wait a bit for communication to be established and it should go away.

Diagnostic Step

If it persists, then make sure the QS-S4 is properly connected to the controller. If you have a plug and play style connector, check it and try disconnecting/reconnecting. If issue persists unplug and plug in LCD connector and see if issue persists; if issue persists, than wiggle the LCD wire in different directions to see is problem persists. Change of wiring hardness from LCD to controller if the issue persists. 

12

BMS comm error

This error code is related to the battery.

Diagnostic Step

Check if battery is able to charge; if battery is able to charge than check connector of battery  to controller; if problem persists then a battery change might be necesary. 

13

Headlight error

This error code is related to the LED lights on your scooter. The connection may have come loose, or the LED itself has been damaged. 

Diagnostic Step

To troubleshoot, you can test the LED with multimeter set in diode test mode.

We hope it has been helpful for you! 

Please feel free to leave a comment below or send us an e-mail at info@liferacer.ch

Have a nice ride!

– Your LIFE RACER Team. –

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