



KESS3 - Hardware Slave Version
The KESS3 is the ECU reprogramming device developed by Alientech. It reads and writes engine control units (ECU) and automatic gearbox control units (TCU) via three communication modes: OBD, Bench and Boot.
The KESS3 replaces both the KESSv2 and K-TAG in a single unit. It features a new microprocessor, next-generation I/O interfaces, integrated sensors and high-performance memory. Read and write times are reduced compared to the previous generation.
This reference corresponds to the device initialised in Slave version. In Slave mode, read files are encrypted. The modified calibration map is provided by your reference Master.
The Slave version allows full read and write operations on the vehicle independently, at a lower entry cost than a Master. It is the configuration chosen by workshops operating within a network around a reference tuner.
Specifications
- Alientech reference: KESS3HW000
- Version: Slave
- ECU and TCU programming
- OBD, Bench and Boot communication modes
- Hardware only, protocols and subscription not included
Identify your reference Master before purchasing: a Slave device is only operational when paired with a Master that supplies the modified files. At least one protocol activation is required to make the device operational.
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KESS3 - Hardware Slave Version
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Ce que fait vraiment votre boîtier
Fonctionnalités réelles du KESS3 Slave
Six fonctions intégrées à l'écosystème Alientech Suite, disponibles dès la sortie de la mallette.
Lecture des calculateurs
Extraction des données d'origine du calculateur moteur ou boîte de vitesses, en mode OBD, Bench ou Boot selon le niveau de sécurité du véhicule.
Flash des fichiers (écriture)
Réinjection du fichier préparé par votre Master directement dans le calculateur, pour une remise en route immédiate du véhicule.
Clonage et sauvegarde ECU/TCU
Extraction intégrale des données d'origine (mode Bench ou Boot) en cas de calculateur en panne ou infiltré par l'eau, pour un clonage sécurisé sur module d'occasion.
DataLogger
Enregistrement en temps réel de jusqu'à 5 paramètres du calculateur (pressions, températures, régime moteur, richesse du mélange...) avec géolocalisation GPS intégrée.
DTC : diagnostic et remise à zéro des codes défaut
Identification et reset des codes défaut stockés dans le calculateur, avec des fonctions spécifiques selon les modèles pris en charge.
DynoDrive
Mesurez puissance, couple et accélération directement lors d'un essai routier, sans passer par un banc à rouleaux.

Who is the Kess3 Salve for?
Le KESS3 est votre clé d'accès au calculateur : il extrait le fichier d'origine et réécrit le fichier optimisé que votre Master vous renvoie. Ce maillon conditionne tout le reste. Avec plus de 3 500 protocoles et trois modes de connexion, il une grande partie du parc et donc la quasi-totalité des prestations d'un atelier de reprogrammation.
Starting your remapping business
You don't yet have the skills to edit a map yourself: the Kess 3 Slave Alientech allows you to charge for stage 1 chip tuning on original vehicles, up to stage 2 and 3 configurations after mechanical modification, by relying on a Master for the editing part. Flexfuel E85 conversion (up to 60% fuel savings announced for your customers) is a common service to offer from the first few months.
You already have diagnostic tools
You already troubleshoot ECUs, but not yet by cloning: in Bench or Boot mode, the Kess 3 Slave Alientech extracts all data from a faulty or infiltrated ECU or TCU, to be sent to your Master for re-injecting the immobilizer and mileage into a used module. It also handles recurring faults such as clogged DPFs, fouled EGR valves, faulty AdBlue modules, or deactivation of fault codes related to a removed mechanical part (Swirl Flaps, pop and bang), within the current legal framework.
You advise utility fleets
In eco-tuning, the Kess 3 Slave Alientech shifts the torque curve to lower RPMs to reduce fuel consumption by 5 to 15% on loaded vehicles, a direct budgetary argument for a fleet manager. Coupled with the DynoDrive option, you can convert this gain into a quantified report given to the client.
Clonage et récupération de calculateurs
Ici, le KESS3 est directement la prestation. Calculateur moteur ou boîte noyé, corrodé, électroniquement hors service : vous extrayez l'intégralité des données d'origine en Bench ou en Boot, antidémarrage et kilométrage compris, et vous les réinjectez dans un module d'occasion. Vous sauvez un véhicule que le réseau constructeur aurait facturé cher et vous captez une clientèle que personne d'autre ne sait dépanner.
Maintenance des systèmes antipollution
Apportez des solutions concrètes face aux FAP colmatés, vannes EGR encrassées ou modules AdBlue défaillants. Apportez une solution efficace selon la réglementation en vigueur.
Contrôle et preuve du résultat
DataLogger et DynoDrive sont intégrés. Vous enregistrez les paramètres moteur en roulage, vous mesurez le gain sans banc de puissance, et vous remettez au client un relevé chiffré. C'est ce qui transforme une prestation invisible en résultat démontrable
THREE MODES, ONE BODY
Kess3: OBD, Bench, and Boot in a single tool
A housing designed to work on almost all engine and gearbox ECUs on the market, with sensational performance and immediate usability.

Prove your settings with DynoDrive
Rather than sending a customer away with a promise, DynoDrive transforms each test drive into a quantified report: power and torque measured via the OBD port and the device's onboard GPS, without investing in a rolling road.
This allows you to bill for your chip-tuning services with tangible proof and build loyalty with customers who want to see the results rather than just take your word for it.
FROM DIAGNOSTIC READING TO REINJECTED FILE
How does the Slave version work?
1. You extract the data
According to the calculator, you choose the OBD port from the cabin for speed, the external connector in Bench mode without opening the ECU, or direct access to the microprocessor in Boot mode for the most locked units.
2. Your Master edits the file
The extracted file is encrypted and then transmitted via the Alientech Cloud to your Master, which prepares the requested mapping or cloning data; you do not intervene in the editing process.
3. You reinject in the workshop
The corrected file is ready for your use: you write it to the vehicle's ECU, without ever needing mapping engineering skills.
Ce Kess 3 Slave, comparé au Master
Vous êtes sur la page du Slave. Voici ce qu'il inclut déjà, et ce qui change si vous passez sur un Master.
Product details
Hardware
Processor
New generation microprocessor, 7 times more powerful than the previous generation
Chassis
Technical fiberglass shell, ultra-light, flexible, and resistant to workshop shocks and vibrations
Onboard Connectivity
Integrated GPS, accelerometer, Bluetooth, and Wi-Fi
USB
Full Speed USB controller, transfers up to 10x faster via the Alientech Cloud
Connection methods
OBD
Communication via the diagnostic socket, automatic protocol management
Bench
Direct reading on the ECU's external connector
Boot
Access to the microprocessor on an open electronic board
Supported lines
Ethernet, FlexRay, CAN Bus, K-Line, L-Line, J1850, J1708
Software — Alientech Suite
Interface
Sleek and modern design, instant vehicle or microprocessor search in seconds
Documentation
Multilingual technical manuals (French included), illustrated step-by-step guides for each ECU
Updates
12 months of protocol updates included; the tool remains functional on previously acquired vehicles
Slave Status
Linked to a Master for file editing; upgradeable to Master at any time
Required PC configuration
System
Windows 10 or 11 (64-bit)
Processor
2.5 GHz minimum
Memory
8 GB RAM minimum, sufficient disk space for the daily database
Connection
Permanent internet connection required for use








FAQ
What is the difference between KESS3 Slave and KESS3 Master?
The Slave allows reading and writing of ECUs but must be connected to a Master to edit mapping files. The Master operates independently and can create or modify files.
Can the KESS3 Slave be upgraded to a Master version?
Yes, at any time, subject to the approval of your assigned Master.
What vehicles are compatible with the KESS3?
Depending on the activated protocol packs: cars and light commercial vehicles, motorcycles/quads/UTVs, agricultural machinery and heavy goods vehicles, or boats and jet skis.
Is a subscription required to use the KESS3 Slave?
The tool includes 12 months of protocol updates. After this period, the device remains fully functional on vehicles already acquired; renewal is required to add new vehicles or protocols.
Is the protocol pack included in the displayed price?
No: the KESS3 Slave does not work without an activated protocol. Select the pack(s) corresponding to your activity when ordering.
What is the DynoDrive feature?
An exclusive innovation for the Alientech Suite ecosystem that calculates a vehicle's power and torque in real-time via the OBD and on-board GPS, without needing a dynamometer.


Become an RS-Tronic reseller
- €0 joining fee: No entry ticket to join the group
- 90+ resellers in France and internationally: A network that proves the model works
- Bench-developed files: Manufacturer tolerances and anti-pollution standards respected
- Autonomy preserved: The strength of a large group, your company remains your own


