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Launch X431 Diagun IV Full Version Automotive Full System Diagnostic Tool Bidirectional Control Scan Tool 2 Years Free Update Online

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Latest price: US$639.00
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Product Description

New X431 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.

Launch X431 Diagun IV Full Version Automotive Diagnostic Tool Bidirectional Control Scan Tool with All Cables and Adapters

Launch X431 Diagun IV Full Version


1. Dealer Code: 755D
2. With Android 7.0 system, Support Wi-Fi One-Click Update
3. 2 Years Free Update Online on Launch Official Web
5. SD Card Storage: 16GB Storage, (Expandable up to 64GB)
6. 5.5 inch capacitive screen, Handset, Easy to Operate, Avoid Broken or Lost Bluetooth Adpater.
7. Add Special Function: Brake Reset, Oil Reset, SAS Reset, BAT.Reset, Bleeding, Elec.TH Tottle Rottle Rlrn, TPMS Reset, DPF REG.IMMO, Injector
8. Support Multi-Language: English, French, Spanish, German, Russian, Korean, Japanese, Portuguese, Italian, Polish, Dutch, Hungarian, Finnish, Turkish, Greek, Arabic, Danish Persian, Romanian, Serbian, Swedish, Chinese..

What's the Advantage of X431 Diagun IV?

[ALL SYSTEM DIAGNOSTIC TOOL]: Launch X431 Diagun iv is one powerful automotive scan tool, read and clear fault codes for all system of car such as Engine, ABS, SRS, Transmission, Brake system, Emission system, Fuel system, Light system, Wiper system, Body, Power strain, Chassis, etc. anty OBD2 Scanner

[BIDIRECTIONAL + ACTUATION TEST ]: Diagun iv is obd2 scanner with Bi-Directional Control which issued to request information or command a module to perform specific tests and functions, it can do some actuation test, for example , turning on and off the a/c clutch, fuel pump, purge control solenoid and act. It is professional DIY automotive tool for mechanic.

[11 RESET SERVICES + KEY PROGRAMMING] : Launch x431 comes with special functions which make it to be one popular DIY tool on , including Key Fob Programming, Injector Coding, Oil Reset Service, IMMO Reset, Steering Angle Calibration , Electronic Parking Brake Reset, Battery Register/Battery Maintenance, ABS Bleeding, Electronic Throttle Position Reset/Relearn, Diesel Particulate Filter (DPF) Regeneration, Tire Pressure Monitor System Reset, Gear Learning.

[EXTENSIVE VEHICLE COVERAGE]: X431 diagun iv can diagnose the electronic control system of prevailing vehicle models covering Asian, European, American, up to 108 car brands, over 10000 car models. Full range car models and full car system diagnose make it a professional automotive diagnostic tool !

Launch X431 Diagun IV Full Version


X-431 Diagun IV is a diagnostic tool specially designed for automotive maintenance technicians. Tiny body, powerful diagnostic function, wireless bluetooth diagnoses, convenient online upgrade and integrated multifunctional connector are all the preferable choices for a technician.
X-431 Diagun IV has completely carried forward the diagnostic functions of X-431, testing almost all domestic vehicles and imported vehicles from Asia, Europe and America. With wide car model coverage, powerful diagnostic function and accurate test data, it achieves full-model and full-system trouble diagnosis and makes diagnosis and maintenance easier and costs even less.

Besides, the product becomes more competitive by the application of engine oil reset, brake pad reset, steering angle reset, tire pressure reset, throttle adaptation, ABS bleeding, battery matching, DPF regeneration and injector coding function.
Launch X431 Diagun IV Full Version

Vehicle Supported List:

For ASTONMARTIN/ for BMW/ for CITROEN/ for LANDROVER/ for PEUGEOT/ for ROVER/ for SKODA/ for VOLVO/ for AUDI/ for BXFIAT/ for FERRARI/ for MASERATI/ for PORSCHE/ for SAAB/ for SMART/ for VW/ for BENZ/ for BXGM/ for FIAT/ for OPEL/ for RENAULT/ for SEAT/ for SPRINTER




For GAZ/ for IZH / for PAZ/ for SEAZ/ for UAZ/ for UAZ/ for VAZ/ for ZAZ


Launch X431 Diagun IV Full Version
Note: Software with red font is required to be purchased separately

Supported Functions:

Besides classical 4 systems, you are able to use this diagnostic tool to diagnose your car in complete systems, such as Fuel system, Emission system, Body, Powertrain and more. You are capable of reading hard DTCs when there are some issues with your vehicle's systems, clearing the trouble codes after handling malfunctions. To make sure all the systems performs well, you can view live data stream before driving out

Launch X431 Diagun IV Full Version

Bi-Directional / Active test : This diagnostic tool supports active test (Bi-directional control) to request information or command a module to perform specific tests and functions. such as turning the fuel pump on and off, cycling the a/c clutch on and off.

Key FOB Programming: If you lost one key of car, launch x431 diagun iv can help you add a new one , but you need to get the PIN# of your car before you copy a key. NOTE: diagun iv can not reprogram.

ECU Coding: Every automobile actuator has a record code in ECU, which is the basis for automobile computer to mobilize their work. LAUNCH diagun iv is equipped with advanced ECU coding function for addressing the following issues:

1. After you change the bad actuators or certain parts, you need to use this function to make a new code and recognize the new actuators.
2. ECU coding enables multiple car systems to recognize each other and then the actuators can start to work.
Note: ECU Coding and Key FOB Programming are not universally compatible with all vehicles! Send us VIN number to check compatibility.

Launch X431 Diagun IV Full Version

Launch X-431 Diagun IV can program and code the electronic control system of prevailing vehicle models, also perform special functions,including:

1) Oil Reset Service: Allows you to perform reset maintenance mileage and data intervals for a new calculation of Engine Oil Life system once changed the oil.
2) Steering Angle Calibration: Help clear he fault steering angle sensor memories and plays an important role in the steering angle sensor calibration.
3) Electronic Parking Brake Reset (EPB): It is important in the maintenance of electronic braking system's safety and efficiency when replace brake pad or motor
4) Battery Register/ Battery Maintenance (BRM): Allows the scan tool to evaluate the battery charge state, monitor the close-circuit current, register the new battery replacement, and activate the rest state of the vehicle battery system
5) ABS Bleeding: The auto bleed procedure is used on BOSH 5.3 equipped vehicles.This procedure uses a scan tool to cycle the system solenoid valves and run the pump in order to purge the air from the secondary circuit.
6) Electronic Throttle Position Reset/Learn (ETP): vehicle's throttle position system sensor connected to the butterfly spindle and is primarily used to
monitor the throttle position within an inner combustion engine. Due to its location, the throttle position sensor is able to effectively observe where the throttle butterfly valve is positioned.
7) Diesel Particulate Filter (DPF) Regeneration: Specially works for Diesel Particulate Filter system with DPF regeneration,DPF component replacement teach-in and DPF teach-in after replacing the engine control unit
8) Tire Pressure Monitor System Reset (TPMS): Makes tpms senser in displaying sensor IDs from the vehiclersquos ECU, inputting TPMS sensor replacement IDs and activate tpms sensors. This function is used to reset the tire pressure sensor. When the car tire air pressure fault indicator is on, after the repair, the tire pressure system needs to be reset by the tire pressure reset function, and the tire pressure fault indicator is extinguished.
9) Gear Learning: The scan tool monitors certain Camshaft position sensors signals to determine if all conditions are met to continue with the procedure for Engine running. The crankshaft position sensor adaptive learning, the crankshaft position sensor learns the machining error of the crankshaft teeth, and stores it in the computer to more accurately diagnose the engine misfire.
10) Immobilizer Matching (IMMO): The unique function is mainly used to disable the lost vehicle keys and program a new replacement key fob. In order to prevent the car from being used by the illegal key, the car can be opened and used after the anti-theft control system on the car recognizes and authorizes the remote control key through the anti-theft key matching function.
11) Fuel Injector Coding: Diesel injector code need programming ID and parameters to the ECU for accurate communication and Injection control system. This function can write the actual code of the injector or rewrite the code stored in the ECU into the code corresponding to each cylinder nozzle, so as to more accurately control or correct the fuel injection amount of each cylinder.

Launch X431 Diagun IV Full Version

Launch X431 Diagun Partial Functions Show:

Health Report (Quick Test)
This function varies from vehicle to vehicle. It enables you to quickly access all the electronic control units of the vehicle and generate a detailed report about vehicle health.

Launch X431 Diagun IV Full Version

View Fault Report
This function allows you to view the health report in details.
The systems that have been found OK are shown in black under the Normal tab.
The tested systems with faults are listed under the Fault tab and the number of
DTC is displayed in red next to the system. Tap > to view the detailed DTC information of the current system.

Launch X431 Diagun IV Full VersionLaunch X431 Diagun IV Full Version

Clear DTC
This function lets you clear the existing diagnostic trouble codes in health report.
Tap "Clear DTC", a confirmation dialog box appears. Tap "Yes" to clear all the diagnostic trouble codes. Tap "No" to abort it.

System Scan
This option allows you to quickly scan which systems are installed on the vehicle.Tap "System Scan", the system start scanning the systems. Once the scanning is complete, the screen will display the result.

Launch X431 Diagun IV Full Version

This option allows you manually select the test system and function step by step.
Tap "System Selection", the screen displays as follows:

Launch X431 Diagun IV Full Version
Swipe the screen from the bottom to view the vehicle system on the next page.
Tap the desired system (take "ECM" for example) to jump to the test function page.

Launch X431 Diagun IV Full Version

Launch x431 Diagun IV VS. Launch X431 Diagun III

Item Launch X431 Diagun IV Launch X431 Diagun III
Operating Android 7.0 WIN CE 5.0
Processor Quad core 1.1 GHz 400 MHz ARM9
Memory 1GB(Expandable up to 32 GB) 1G TF Card
Storage 16GB(Expandable up to 64 GB) 1GB
LCD Screen 5.5 inch IPS screen with a resolution of 1280*720 194*86*33MM,4.3 inch LCD with touch screen
Battery 2500mh rechargeable polymer lithium battery 3800 mAh
Official Website
Language English,German,Japanese,Russian,French,Spanish
Arabic,Korean,Traditional Chinese...
Update 2 Years Free Update Online 1 Year Free Update
Bluetooth Bluetooth 4.1.10m(Without Obstacle) Theoretically 100m,suggest 15-20m
WiFi Wi-Fi:WLAN 802.11 b/g/n USB
Function Full-diagnosis,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
Monitior System Reset
Full diagnostic (Read/ erase DTCs,diaplay live
data stream etc)
Vehicle Model List Abarth,Acura,Alfa,Romeo,Audi,Bentley,BMW,Buick,Cadillac,Chevrolet
Jeep,Land Rover,Lexus,Mazda,Mercedes Benz,Mini,Mitsubishi,Nissan
Australia Ford,Brazil GM/Fiat
ZhongShun, Zhongxing,ZOTYE
Europe: Audi,Benz,BMW,Citroen,Dacia,Ford,Fiat,Jaguar,
Lancia,Land Rover,Opel,Peugeot,Porsche,Renult
& V-Class,Volkswagen,Volvo
Japan: Daihatsu,Honda,JPIsuzu,Mazda,MitsubisHI,
Other Cable Non-16 pin cable 9 pcs
Printer Buy X431 Printer (SO118) Buy SO118 Pinter

X-431 Diagun IV handset

Launch X431 Diagun IV Full Version

1 Front camera 
2 Slot for VCI connector For housing the VCI connector. 
3 Speakers 
4 Ambient light sensor

5 VOLUME +/- Key 
* To adjust the volume. 
* To print the screen, hold and press the 
* POWER and VOLUME – key until a snapshot pops up on the screen. The captured snapshot is saved in the "Screenshots" folder.

6 POWER/Screen lock key 
In Off mode, press it to turn X-431 Diagun IV on; 
In On mode, turn X-431 Diagun IV off with long press or lock screen with short press. 

7 LCD screen 
8 USB/Charging port To connect to the power adaptor for charging the X-431 Diagun IV handset

VCI connector (Only applies to 12V passenger cars)

Launch X431 Diagun IV Full Version

1 OBD-16 diagnostic connector: To connect on vehicle's OBD2 DLC.
2 Mini USB port: For connecting the USB cable to the tablet to perform vehicle diagnosis. (Note: This port is disabled for X-431 Diagun IV.)
3 Mode indicator 
* It illuminates red when the VCI connector is connected to the vehicle's DLC. 
* Blue indicates the VCI connector is working in Bluetooth mode.

Precautions on Using X-431 Diagun IV

Before using this test equipment, please read the following safety information carefully.
1. Always perform automotive testing in a safe environment.If the VCI connector remains unused for a long period of time, it is suggested to unplug the connector from vehicle's DLC to conserve battery power.
2. Wear an ANSI-approved eye shield when testing or repairing vehicles.
3. The vehicle shall be tested in a well ventilated work area, as engines produce various poisonous compounds (hydrocarbon, carbon monoxide, nitrogen oxides, etc.)
4. Do not connect or disconnect any test equipment while the ignition is on or the engine is running.
5. Put blocks in front of the drive wheels and never leave the vehicle unattended while testing.
6. Keep the test equipment dry, clean, free from oil, water or grease. Use a mild detergent on a clean cloth to clear the outside of the equipment as necessary.
7. Do not drive the vehicle and operate the test equipment at the same time. Any distraction may cause an accident.
8. Keep clothing, hair, hands, tools, test equipment, etc. away from all moving or hot engine parts.
9. Before starting the engine, put the gear lever in the Neutral position (for manual transmission) or in the Park (for automatic transmission) position to avoid injury.
10. To avoid damaging the test equipment or generating false data, please make sure the vehicle battery is fully charged and the connection to the vehicle DLC (Data Link Connector) is clear and secure.
11. Automotive batteries contain sulfuric acid that is harmful to skin. In operation,direct contact with the automotive batteries should be avoided. Keep the ignition sources away from the battery at all times.


1. How to save power?
Please turn off the screen while X-431 Diagun IV keeps idle.
Set a shorter standby time.
Decrease the brightness of the screen.
If WLAN connection is not required, please turn it off.
Disable GPS function if GPS service is not in use.

2. What should I do in case I forgot the screen lock?
You can set screen lock as pattern or password. If you forgot the password, please consult your device provider or reset your device.
Warning: Resetting may cause data loss. Before use, please make sure important data has been backed up.

3. How to do if the system runs slow?
In this case, please do the followings:
> Check all running applications and stop the unnecessary applications (Steps: Settings -> Apps -> Running -> Tap the desired application and then tap "Stop").
> Check all installed applications, remove the unnecessary applications (Steps: Settings -> Apps -> Downloaded -> Tap the desired application and then tap "Uninstall").
If all steps mentioned above are finished and the system still works slowly. Please try to close the system and reboot your X-431 Diagun IV.

4. How to reset X-431 Diagun IV?
Resetting may cause data loss. Before doing so, please make sure important data and information has been backed up.
Do the following to reset X-431 Diagun IV:
1. Tap "Settings" --> "Back & Reset";
2. Tap "Factory data reset";
3. Tap "Reset tablet";
4. Tap "Clear all data" to start resetting until the tool automatically reboots.

Launch X431 Diagun IV Full Version
Launch X431 Diagun IV Full Version

Launch X431 Diagun IV Technical Parameters:

Operating system:                 Android 7.0
Processor:                              Quad core 1.1 GHz
Memory:                                1GB
Storage:                                 16GB (Expandable up to 64GB)
LCD screen:                           5.5 inch IPS screen with a resolution of 1280 x 720 pixels
Camera:                                 Front-facing 2MP camera + rear-facing 8MP camera
Battery:                                  2500mh rechargeable polymer lithium battery
Connectivity:                          Wi-Fi: WLAN 802.11b/g/n
Bluetooth:                              Bluetooth 4.1
Working temperature:           0℃ ~ 45℃
Storage temperature:            -10℃ ~ 50℃

VCI connector Parameters:

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

Package List:

1. X-431 Diagun IV Main Machine
2. Bluetooth connector
3. Password envelop
4. Hardware & Software list
5. OBD Extension Cable
6. OBDII cables
1x For Suzuki-3
1x For Fiat-3
1x For Benz-14
1x For Audi-4
1x For Nissan -14+16
1x For Mitsubishi HYUNDAI -12+16
1x For Toyota-22
1x For Toyota-17
1x For Honda-3
1x For Mazda-17
1x For Ford -6+1
1x For SsangYong-20
1x For Kia-20
1x For GM VAZ-12
1x For Daewoo-12
1x For Geely-22
1x For Bmw-20
1x For Benz-38
1x For GAZ
1x Lighter
2x Lighter Fuse

Launch X431 Diagun IV Full Version

Launch X431 Diagun IV Full Version

Contact Information:

Whatsapp: +86  199 4758 6579

Scan QR code to order anywhere and anytime by mobile phone
Scan QR code to order anywhere and anytime by mobile phone

Technical Service

User Registration

Tap "Login" on the upper right corner of the main menu screen

How to Register and Activate Launch X431 Diagun IV

1. If you are a new user, tap "New Registration". See Fig.4-3 below

How to Register and Activate Launch X431 Diagun IV

Note: To obtain better service, you need to provide real information.

A. Create App account: In Fig.4-3, fill in the information in each field and then tap "Register", a screen similar to the following will appear:
How to Register and Activate Launch X431 Diagun IV

B. Activate the VCI connector: In Fig.4-4, input the Serial Number and Activation Code, which can be found in the password envelope.

How to Register and Activate Launch X431 Diagun IV

Note: To exit and activate it later, tap "Skip". In this case, you can activate your connector by tapping "Activate Connector" in "Personal Center".

C. Download diagnostic software: Tap "Activate", a dialog box similar to Fig.4-6 will appear:
How to Register and Activate Launch X431 Diagun IV

To download the diagnostic software, tap "Yes" to enter the software download page. Tap "No" to download it later. 
On the download page, tap "Update" to start downloading. It may take several minutes to finish it, please be patient to wait. To pause downloading, tap "Pause". To resume it, tap "Continue". 
Once download is complete, the system will install the software package automatically.

2. If you have registered to be a member, input your name and password, and then tap the "Login" button to enter the main menu screen directly.
Note: X-431 Diagun IV has an auto-save function. Once the username and password are correctly entered, the system will automatically store it. Next time you login the system, you will not be asked to input the account manually.

3. If you forgot the password, tap "Retrieve Password", and then follow the on-screen instructions to retrieve it.

How to Register and Activate Launch X431 Diagun IV

How to Set Up Diagun IV Bluetooth Connection?

1. Bluetooth Setting
Enter X-431 Diagun IV Bluetooth setting screen ("Settings" -> "Bluetooth"), slide the Bluetooth switch to ON and X-431 Diagun IV will start searching available Bluetooth device, tap the desired connector to pair. By default, the Bluetooth name is 98729*****00 (where ***** stands for 5 digits.).
Note: In case no Bluetooth setting is done before diagnostic software is launched, you can also configure it while using the software. 

2. How to Connect/Disconnect Diagun IV to WiFi?
Note: If you don't need to use Wi-Fi for a while, you can turn it off to conserve battery life.

X-431 Diagun IV has built-in Wi-Fi that can be used to get online. Once you're online, you can register your X-431 Diagun IV, surf the Internet, get apps, send email, launch the remote diagnosis, and check for software updates etc.

3. Connect to a Wi-Fi network
1. On the home screen, tap Settings -> WLAN.
2. Slide the Wi-Fi switch to ON, X-431 Diagun IV will start searching for available wireless networks.
3. Select a wireless network, y If the chosen network is open, X-431 Diagun IV will connect automatically; y If the selected network is encrypted, a network password will need to be entered.
4. When "Connected" appears, it indicates the Wi-Fi connection is complete.
Note: When Wi-Fi is not required, this should be disabled to conserve battery power. Once it is connected successfully, tap the Wi-Fi network from the list to view its name, link speed, security type, IP address etc. When this tool is in range, it will connect to the previously linked network automatically.

4. Disconnect from a Wi-Fi network
1. On the home screen, tap Settings -> WLAN.
2. Tap the network with a Connected status, then tap "Disconnect".

Launch X431 Diagun IV Connections:

1. Preparation:
Normal testing conditions
1. Turn on the vehicle power supply.
2. Vehicle battery voltage range should be 9-14 Volts.
3. Throttle should be in a closed position.

Select the VCI connector
If X-431 Diagun IV is testing vehicles equipped with universal OBD II diagnostic socket, please use the included VCI connector. (For vehicles with non-OBD II?diagnostic socket, a non-16 pin connector is required.)

2. DLC location:
The DLC (Data Link Connector) is typically a standard 16-pin connector where diagnostic tools interface with a vehicle's on-board control modules. The DLC is usually located 12 inches from the center of the instrument panel, under or around the driver's side for most vehicles. See Fig. 4-7 for DLC location of different vehicles. If DLC is not located under dashboard, a label should be there telling location. For some Asian and European vehicles, the DLC is located behind the ashtray and the ashtray must be removed to access the connector. If the DLC cannot be found, refer to the vehicle's service manual.

3. Vehicle connection
The method used to connect the VCI connector to a vehicle's DLC depends on the vehicle's configuration as follows:
1. A vehicle equipped with an OBD II management system supplies both communication and 12V power through a standardized DLC.
2. 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.

Follow the steps mentioned below to connect OBD II vehicle:

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 cable to vehicle's battery, and the other end to the power jack of OBD I adaptor.
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