Launch X431 Diagun IV Diagnostic Tool is Full Set Launch X431 Diagun IV with Full Connectors. New Launch X-431 Diagun IV Full Package With All Adapters Update Online 2 Free Years. Launch X431 Diagun IV Bi-Directional Automotive Diagnostic Tool better than old Launch diagun iii 3 And Launch X431 IV Master.

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Launch X431 Diagun IV full package with full adapters is an slim evolutionary vehicle diagnostic tool. Featuring a quad-core 1.1GHz processor, and a 5.5 inch capacitive screen, X-431 Diagun IV delivers diagnostic functionality which helps to diagnose vehicle issues more efficiently.

Launch X-431 diagun iv, can replace X431 Diagun III or X431 IV, is a new diagnostic tool release by Launch tech. It is composed of anX431 Diagun IV computer, a protection sleeve, a DBScar diagnostic connector and many OBD1 to OBD2 connectors. It communicates with your car by DBSCAR connecting with Bluetooth, it reads car DTCs and does diagnose function by the X431 Pro Pad computer, it achieves X431 series full car model and full system diagnostic function.

Reason to choose Launch X431 Diagun IV:​

1, 2017 Diagun Latest version: Diagun IV

2, With Android 7.0 system, support wifi one-click update

3, Handset, Easy to operate, avoid broken or lost bluetooth adpater.

4, Update online two years for free, update cost is 399USD/year, after first two years

5, Multi-language, easy to change the language by yourself:
     English,Spanish,French,Russian,Japanese,Arabic,Korean,Italian,German,
     Danish,polish,Finnish,Dutch,Portuguese,Swedish,Turkish,Greek,Hungarian,Romanian,Serbian.

6, SD Card storage: 16GB Storage,Enough room to download all software you want



7, Add Special Function: Brake Reset,Oil Reset,SAS Reset,BAT.Reset,Bleeding,Elec.TH Tottle 6,Rottle Rlrn, TPMS Reset, DPF REG.IMMO,Injector



X-431 Diagun IV is an slim evolutionary vehicle diagnostic tool. Featuring a quad-core 1.1GHz processor, and a 5.5 inch capacitive screen, X-431 Diagun IV delivers diagnostic functionality which helps to diagnose vehicle issues more efficiently.

In addition, X-431 Diagun IV supports Wi-Fi connection, one-click update, diagnostic feedback and all kinds of service functions (including oil lamp reset etc).

Launch X-431 Diagun IV Features:

1.Diagnostics:

  A.Diagnose

    *Diagnose the electronic control systems of prevailing vehicle models covering Asian, European, American and Chinese. Diagnosis functions include: Read DTCs, Clear DTCs and Read data stream etc.

    *Specially designed for Android platform with clear and user-friendly interface.

    *Via Bluetooth, it is simple for the VCI connector to communicate with X-431 Diagun IV.

  B.Reset: Includes all kinds of maintenance resets.

  C.One-click Update: lets you update diagnostic software and APK more efficiently.

2.Browser: built-in Wi-Fi module makes surfing on the internet freely.

3.Email: allows you to send and receive emails.

4.Settings: to configure your personalized X-431 Diagun IV through it.

5.Applications: other android based applications can be customized to install or uninstall.



Function menu:

Name                                                  Description                                                                        

Diagnose                         Configures   X-431   Diagun   IV   to   operate   as   a diagnostic tool.

Special Function              To perform some maintenance items, including electronic throttle position reset, ABS bleeding, oil lamp reset etc.

Feedback Diagnosis        This option allows you to feed back the diagnostic reports/software bugs to us for troubleshooting and analysis.

Software Upgrade            To update vehicle diagnostic software. If you keep signed in, a pop-up message will appear on the screen once a newer version is detected.

Maintenance Help            To browse the FAQ, Quick Start Guide, User Manual and How-To videos.

Personal Center               To manage, activate your VCI connector, diagnostic report or personal information etc.

Vehicle connection:

The method used to connect the VCI connector to a vehicle’s DLC depends on the vehicle’s configuration as follows:

• A vehicle equipped with an OBD II management system supplies both communication and 12V power through a standardized DLC.

• A vehicle not equipped with an OBD II management system supplies communication through a DLC connection, and in some cases supplies 12V power through the cigarette lighter receptacle or a connection to the vehicle battery.

For non-OBDII vehicle,proceed as follows:

1. Locate vehicle’s DLC socket.

2. Plug the VCI connector into the vehicle’s DLC socket (It is suggested to use the OBD II extension cable to connect the VCI connector and DLC socket).

3. Choose one of the two ways to obtain power from:

   A. Power adaptor: Connect one end of the included power adaptor to DC IN port of X-431 Diagun IV handset, and the other end to AC outlet.

   B. Internal battery pack

For non-OBDII vehicle, proceed as follows:

1. Locate vehicle’s DLC socket.

2. Select the corresponding non-16pin connector.

3.  Plug the non-16pin end of the connector into the DLC socket, then connect the other end to the OBD I adaptor, and then tighten the captive screws.

4. Connect the other end of the adaptor to the included VCI connector.

5. To supply power to OBD I adaptor from:

   A. Cigarette Lighter cable(optional): Connect one end of the cigarette lighter cable to vehicle’s cigarette lighter receptacle, and the other end to the power jack of OBD I adaptor.

   B. Battery Clamps Cable(optional): Connect one end of the battery clamps

Reset function:



The Reset section is specially designed to provide you quick access to the vehicle systems for various scheduled service and maintenance performances. All resetting operations are driven by executive commands. Just by following the on-screen prompts to select appropriate execution options, input correct values or data, and perform necessary actions, the system will guide you through the complete performance.

The most commonly performed service functions contain:

• Oil Reset Service

• Steering Angle Calibration

• Electronic Parking Brake Reset

• Battery Register / Battery Maintenance

• ABS Bleeding

• Electronic Throttle Position Reset / Learn

• Diesel Particulate Filter (DPF) Regeneration

• Tire Pressure Monitor System Reset

Launch X431 Diagun IV Support Car List:

Wide Vehicle Coverage: both  of 12V diesel and 12V gasoline are ok



X-431 Diagun IV Technical Parameters:



VCI connector:

Working voltage:9~18V
Working temperature:-10℃~55℃
Storage temperature:-20℃~70℃
Relative humidity:20%~90%

Launch X431 Diagun IV with full adapters Package List: 

1pc x Launch X-431 Diagun IV overseas host RoHs
1pc x DBScar lV diagnostic connector RoHs
1pc x X431 AIT OBD16  extension ine RoHs
1pc x Diagun IV quickstart(English)RoHs
1pc x X431 PIN anvelope
1set x Launch X431 Connector Set Package

X431 Diagun IV User Guide:









Launch x431 Diagun IV VS. Launch X431 Diagun III