1. Introducció
The FOXWELL JT400 is a professional 4-cylinder heated ultrasonic fuel injector cleaner and tester designed for both GDI (Gasoline Direct Injection) and traditional EFI/FSI (Electronic Fuel Injection/Fuel Stratified Injection) injectors. This machine provides comprehensive testing and cleaning functions to ensure optimal performance of your vehicle's fuel system. Please read this manual thoroughly before operation to ensure safe and effective use.

Figure 1: FOXWELL JT400 Main Unit and Key Functions
2. Informació de seguretat
Observeu sempre les següents precaucions de seguretat per reduir el risc de lesions o danys a l'equip:
- Assegureu-vos que la màquina estigui col·locada sobre una superfície estable i plana.
- Operar en una zona ben ventilada per evitar la inhalació de vapors de combustible.
- Wear appropriate personal protective equipment (PPE), including safety glasses and chemical-resistant gloves.
- Do not smoke or use open flames near the machine.
- Use only approved cleaning and test fluids.
- Desconnecteu l'alimentació abans de realitzar qualsevol manteniment o neteja.
- Mantingueu els nens i el personal no autoritzat allunyats de la zona d'operació.
- No feu funcionar la màquina si alguna peça està danyada o falta.
3. Contingut del paquet
Verifiqueu que tots els elements que s'enumeren a continuació s'inclouen al vostre paquet:

Figure 2: FOXWELL JT400 Package Contents
- JT400 Main Unit
- Toolbox (x1)
- Manual d'usuari (x1)
- Swiss thread adaptor for fuel top-supply injector (x4)
- Adaptor for GDI injector (D16) (x4)
- Top Oil Supply Connector (D17.5) (x4)
- Hexangular Stopper (x4)
- Oring (9.7*2.65) (x10)
- Adaptor 1 for fuel top-supply injector (x4)
- Coarse thread adaptor for fuel top-supply injector (x4)
- Adjusting pole (H80) (x1)
- Fuel distributor package (x1)
- Injector cleaning bracket (x1)
- Pressing screw (x1)
- Ultrasonic cleaner cover (x1)
- Knurled nut (x1)
- 4-cylinder pulse signal cables (x1)
- Pulse signal connection cable3 (x4)
- Pulse signal connection cable1 (x4)
- Pulse signal connection cable4 (x4)
- Powercable (x1)
- Oil outlet adapter (x1)
4. Producte acabatview
4.1 Components principals

Figure 3: FOXWELL JT400 Main Components
- Port d'ompliment
- Pulse Cable Socket
- Rentat Basin
- Test Agent Output Tube
- Interruptor d'alimentació
- Presa d'alimentació i fusible
- Type-C Upgrade Port
- Oil Distributor
- Measuring Glasses
- Tauler de control
- Level & Drain Tube
- Rentat Basin Port de desguàs
4.2 Tauler de control

Figura 4: Disposició del tauler de control
- Pantalla: Displays test parameters, results, and menu options.
- Drain button: Initiates the draining process for test fluid.
- Pressure decrease button: Reduces system pressure during tests.
- Tecles de direcció: Navigate through menu options and adjust parameters.
- Botó SORTIR: Returns to the previous menu or cancels an operation.
- Confirm button (ENTER): Confirms selections or starts operations.
5. Configuració
5.1 Col·locació inicial i connexió d'alimentació
- Place the JT400 on a stable, flat workbench in a well-ventilated area.
- Connect the power cable to the Power Socket & Fuse (6) on the unit and then to a suitable power outlet (AC220V or 110V, customized).
- Assegureu-vos que l'interruptor d'alimentació (5) estigui en la posició OFF abans de connectar-lo a l'alimentació.
5.2 Injector Installation
The JT400 supports both GDI and traditional injectors. Injectors are NOT included with the machine.

Figure 5: Top Feed Injector Installation Example
- Select the appropriate adaptors and O-rings for your specific injector type (GDI or traditional).
- Install the injectors into the Top Supply Distributor, ensuring a secure fit with the O-rings to prevent leakage.
- Use the Fixing Screw and Knurled Nut to secure the injectors and distributor assembly firmly into the measuring glasses.
- Connect the Pulse Cable Sockets (2) to each injector's electrical connector.
5.3 Filling Test Fluid
- Open the Fill Port (1).
- Carefully pour the recommended test fluid into the tank until it reaches the appropriate level, typically indicated on the measuring glasses or by a fill line. Do not overfill.
- Close the Fill Port securely.
6. Modes i funcions de funcionament
The JT400 offers various test and cleaning modes for comprehensive injector analysis.

Figure 6: Test Operating Modes
6.1 Funcions principals
- Prova de l'injector: Checks the basic functionality of the injector.
- Prova d'uniformitat: Measures the amount of fuel injected by each injector over a set period to check for consistency.
- Sprayability Test: Observes the spray pattern and atomization of the fuel from each injector.
- Prova de fuites: Checks for any fuel leakage from the injector under pressure.
- Injection Test: Measures the total volume of fuel injected over a specific number of pulses.
- Auto Mode Test: Runs a sequence of predefined tests automatically.
- Variable Speed Test: Simulates various engine RPMs to test injector performance across different operating conditions.
- Ultrasonic Test: Utilizes ultrasonic waves to thoroughly clean clogged injectors in the washing basin.
- On-vehicle Clean: Allows for cleaning injectors while still installed on the vehicle (requires additional setup and accessories, not detailed here).
6.2 Procediment de funcionament
- Turn on the Power Switch (5). The machine will boot up and display the main menu on the Screen.
- Use the Direction Keys to navigate and select the desired test or cleaning mode. Press ENTER to confirm.
- Follow the on-screen prompts to set parameters such as pulse width, RPM, and test duration.
- Start the test/cleaning process. Monitor the injectors in the measuring glasses for spray pattern, volume, and leakage.
- After the test, use the Drain button to empty the test fluid from the measuring glasses.
- For ultrasonic cleaning, place the injectors in the Washing Basin (3), add cleaning solution, and select the Ultrasonic Test mode. Ensure the ultrasonic cleaner cover is in place.
7. Manteniment
7.1 Neteja
- Netegeu regularment l'exterior de la màquina amb un damp tela. Eviteu els netejadors abrasius.
- After each use, ensure all test fluid is drained from the system using the Drain button and the Washing Basin Drain Port (12).
- Clean the measuring glasses and adaptors thoroughly to prevent residue buildup.
7.2 Emmagatzematge
- Store the JT400 in a dry, cool place, away from direct sunlight and extreme temperatures.
- Ensure all fluids are drained before long-term storage.
- Keep all accessories organized in the toolbox provided.
7.3 Actualitzacions de programari
- The unit features a Type-C Upgrade Port (7). Periodically check the FOXWELL official website for software updates to ensure optimal performance and compatibility with new injector types.
8. Solució De Problemes
| Problema | Causa possible | Solució |
|---|---|---|
| La màquina no s'encén | Cable d'alimentació no connectat; Interruptor apagat; Fusible fundit | Check power cable connection; Turn on power switch; Check and replace fuse if necessary. |
| No fluid spray from injectors | No test fluid; Low pressure; Clogged injectors; Incorrect pulse cable connection | Fill test fluid; Check pressure settings; Perform ultrasonic cleaning; Verify pulse cable connections. |
| Fluid leakage during test | Improper injector installation; Damaged O-rings; Loose adaptors | Reinstall injectors correctly; Replace damaged O-rings; Tighten adaptors. |
| Patró de polvorització inconsistent | Partially clogged injectors; Incorrect test parameters | Perform ultrasonic cleaning; Adjust test parameters as per injector specifications. |
| Ultrasonic cleaning not effective | Insufficient cleaning solution; Incorrect temperature; Severely clogged injectors | Ensure adequate cleaning solution; Allow solution to heat up; Repeat cleaning cycle or soak injectors longer. |
9. Especificacions

Figura 7: Especificacions del producte
| Característica | Especificació |
|---|---|
| Voltage | AC220V or 110V (customized) |
| Main-unit Max Power | 300W |
| Mostra | LCD de 4.0 polzades |
| Potència ultrasònica | 60W |
| Interval de pols | 0.5~25ms, step 0.1ms |
| Simulated speed | 100~9900rpm, step 100rpm |
| Resistance measuring precision | 0.1 ohms |
| Volum del dipòsit | 3L |
| Pressió d'oli | 0~8 bar |
| Mida de la unitat principal | 420 * 440 * 503 mm |
| Temperatura ambient | -10 °C ~ +40 °C |
| Mida del paquet | 460 * 490 * 555 mm |
| Humitat ambiental | <85% |
| Ambient magnetic strength | <400A / m |
| Test injectors | 12VGDI+TRADITIONAL INJECTORS |
10. Consells d'usuari
- Always use fresh, high-quality test fluid for accurate results.
- For heavily clogged injectors, consider multiple ultrasonic cleaning cycles or a longer soaking time.
- Ensure the correct adaptors are used for GDI injectors, as they often require higher pressure and specific fittings.
- Keep the pulse signal cables and connectors clean and free from oil or debris to ensure reliable electrical contact.
11. Garantia i Suport
The FOXWELL JT400 Fuel Injector Cleaner Machine typically comes with a 2-year warranty. For technical support, warranty claims, or service inquiries, please contact FOXWELL Official Store customer service. Keep your purchase receipt as proof of purchase for warranty purposes.
For the latest information and support resources, please visit the official FOXWELL weblloc web o contacteu directament amb el seu servei d'atenció al client.





