Launch X431 Master is a good automotive diagnostic tool

Launch X431 Master  has the function of read DTCs, read DataStream, actuation test, sensor waveform display and ECU coding. It’s faster to communicate with cars than X-431 by integrated structure to save time in work. It can test most of cars by using the unique 16 PIN connector which integrates the function of all 16 PIN connectors of X-431. 24V operating voltage capability is added to work with different kinds of batteries. It is easier and more convenient to operate than X-431 based on the smart design.


Multi-language available:
English, Spanish, French, Russian, Portugese, Arabic, Turkish, Italian, Germany, Polish, Japanese

X431 Master Features:
1.  Inherited with all diagnosis function of X-431

2.  Full-range Coverage
Capable of nearly all Asian, European, American vehicles makes.
(Audi, BMW, Benz, VW, Volvo, Opel, Toyota, Honda, GM, Ford, Chrysler…)

3.  Full Electronic System
Engine, ABS, SRS, Immobilizer, Body…

4.  Test most of cars by using unique & integrated 16 PIN connector

5.  Faster communication with cars than X-431 by integrated design to save time in work

6.  24V operating voltage capability is added to work with different kinds of batteries

7.  Integrated Smart box, Main Unit and Printer into a single unit

8.  More convenient to operate than X-431 based on the smart design

9.  Printing
Built-in printer for printing testing results Built-in printer for printing testing results

10. Waveform display
Display data stream in waveform

11. Upgrade software anytime and anywhere from internet to keep up with latest models

12. Standard ports
International standard ports
X431 Master Functions:
-Operating system: LINUX
-CPU: 32-bit MPU
-Memory card: 512 M
-Main unit I/O: standard serial/parallel port Main unit I/O: standard serial/parallel port
-Main unit power source: DC 12V/ 24V
-Main unit power: 9W
-Printer: High-speed thermal mini printer
-Printer port: Standard parallel port
-Screen: 240X320 LCD touch screen

Some related tools like Launch X431 Diagun III is also hot, which may help you more.

FORD E4OD – Overdrive Section Failure

COMPLAINT: Overdrive planetary and overdrive sprag failure due to lack of lube.

CAUSE: The cause may be a plugged or restricted lube passage in pump cover. There is a ball and spring under the orificed cup plug making this passage prone to clogging up.

CAUSE: Clean out the lube passage.
To check for restriciton blow into hole in pump cover. (See FIG #l) Air should exit from holes in rear of stator shaft as shown in Figure #2.

Overdrive Section Failure 1 Overdrive Section Failure 2

Vtoolshop also offer the hot car tools like Maxidas DS708 and Memoscan U585 which are very useful, if you like.

MAZDA/FORD GF4A-EL – Solenoid And Terminal i.d.

COMPLAINT: After overhaul, vehicles equipped with GF4A-EL may exhibit a pulsating sensation on forward application, wrong gear starts, downshift’s to 1st at higher speeds or no Reverse. You can find some more car tools like Fiat Scanner and Ford KM Tool to help you.

CAUSE: The cause may be that the wire harness conduit, or protective coating, was removed and solenoid harness connectors may now be attached to the wrong solenoid.

CORRECTION: Refer to Figure 1 for solenoid identification and location on the valve body, and the Mazda part numbers. Refer to Figure 2 for wire color, harness and solenoid connector color and terminal identification.
Solenoid And Terminal i.d.

Solenoid And Terminal i.d. 2

Solenoid And Terminal i.d. 3

Some Frequently Asked Questions And Answers Relating To x-431diagun

Here we list some frequently asked questions and answers relating to X431 Diagun .
About Online Update
Question:  Downloaded diagnostic program package is not listed in the update tool, what is the reason?
Answer: possible causes and solutions:
1. The downloaded diagnostic program and diagnostic update tool should be in the same folder. Please put them in the same folder.
2. The diagnostic update program may have not been fully downloaded. Please download again.

Question:  When the updated software is used in vehicle diagnosis, some car diagnostic tool program can not be downloaded successfully from the TF card. Why?
Answer: possible causes and solutions:
1. The Display Program may have not been updated. Please update the Display Program.
2. The diagnostic program for the vehicle may be damaged. Please re-download the diagnostic program and update.

About Hardware
Question:  Why the LCD touch screen responds so slowly in cold weather?
Answer: It is because the ambient temperature is close to the lower limit of operating temperature range (0-50 ℃). In this situation, it is necessary to warm up the machine for 30 minutes before test.

Question:  Why there is no character on the backlit screen?
Answer: Check if the power is well connected. Turn off the machine, unplug it and then plug it again for power supply, one second later, try to turn on the machine.

Question:  Why X-431Diagun fails in communication with ECU?
Answer: Please check and make sure that the diagnostic connector and diagnostic program are matching the vehicle make.

Question:  The screen keeps blank after flashing when the machine is turned on.
Answer: Take out the TF card and re-start the machine to check if there is normal display. If the display is normal when the TF card is taken out, the TF card should be replaced. If the screen is still blank, please contact the local service engineer.

Question: Why can’t the data be input after Soft Keyboard is activated?
Answer: The position where the cursor locates can’t be edited. Or you have not activated the cursor in the input position, please use the stylus to click the part to edit. You can input the data if the cursor flashes.

Question:  Why the saved data disappeared?
Answer: There are two possible causes:
1. Your TF card is damaged.
2. You’ve changed language, which is related to the data. You may find the data after switching back to the former language.

Question:  The screen does not respond or responds incorrectly when click with stylus.
Answer: It is necessary to calibrate the screen.

Question:  What can I do when the screen is confused?
Answer: Please quit the current application (interface), and run it again. If the problem still exists, please restart the system.

About System Setting
Question:  The screen is inactive after the cross cursor appears.
Answer: The system is calibrating the touch screen. The machine will work after the calibration completed. Please see “Calibrate Touch Screen” for details.

Question:  The screen does not respond or responds incorrectly when click with stylus.
Answer: It is necessary to calibrate the screen.

Question: The time displayed in the bottom right-hand corner of the screen is incorrect. How to adjust it?
Answer: The time was set incorrectly.

About Operation
Question:  System halts when reading data stream. What is the reason?
Answer: It may be caused by a slackened connector. Please turn off the machine, firmly connect the connector, and switch on the machine again.

Question: The appliance is blank screened after a while during its
Answer: Power saving was set in the power management. Press power key to resume it. Or you can set ‘None’ or extend the standby time in Power Off interface.

Other questions
Question: Screen of main unit flashes at engine ignition moment.
Answer:  Caused by electromagnetic disturbing, and this is normal phenomenon.

Question: Diagnose interrupted during diagnosing process.
Answer: Caused by   electromagnetic disturbing or poor connecting.

Question:  There is no response when communicating with on-board computer.
Answer: Please confirm the proper voltage of power supply and check if the throttle has been closed, the transmission is in the neutral position, and the water is in proper temperature.

Question: The systems equipped with the vehicle can not be diagnosed.
Answer: DLC of some early models is separated; refer to User’s Manual for details.

Question: The fault code storage is blank.
Answer:  Usually, it’s the “suquela” for shared circuit. Please locate and analyze the most similar fault code and its circuit.

Question: There is so much fault code.
Answer:  Usually, it’s caused by poor connection or fault circuit grounding.
Please check and confirm if the Year and make selected is correct or not and if the vehicle is equipped with the right system.

Personal Opinion for Launch X431 Diagun Review

In Most Launch x431 diaguns , I think the chinese launch x431 diagun is the best ,why to say so? Becasue I have compared many x431 diaguns online , in different countries , there are different prices, most in the west countries the price is a little high but in china , it’s much more cheaper.
Maybe you are somehow confused about the launch x431 diagun ,so here I give you a short details about this tool.

Launch X-431 Diagun Functions:

– Open automobile diagnosis function
– Email free update function
– PDA function
– Multi-language

Launch X431 Diagun Available Languages:

English, German, Japanese, French, Polish, Turkish, Russian, Italian, Spanish, Portuguese, Dutch, Arabic, Simplified Chinese and Traditional Chinese.
This is the main tech parameter of the Launch X431 Diagun.
Here is the tool you can see:

Why do I think this launch x431 diagun is good in china ?

There are three points:
1. the chinese x431 diagun’s function is the same with the American.
2.You can receive this x431 diagun quickly by DHL
3.The service is good in china auto scanner.
Don’t you believe it ?
Here you can see the review in amazon.

This review is from: Launch Tech USA 301100119 X431 Diagun (F) Scan Tool (Automotive)

I bought this scanner for it’s cost to function ratio and I am pleased with that decision. It has good bi-directional test function. I have hardly been able to put it down since I started using it. This product DOES NOT come with in depth manual but is quick to learn or if you are using it with a program like alldata you will pick it up quick. I also love the wireless functionality that lets you move around and work while still easily monitoring the values. You can also select your own set of values to monitor and if you want pick two at a time to graph. This thing has to many functions to even began to get into but I do have to say I love the transmission control module functions so much faster to diagnose problems in the transmission. This product is still to the new side of there products so still taking input from users to fix bugs and add new functions but updates are looking like average 600 or so per year. It doesn’t mention it but with the cables it comes with it has serious coverage in pre 96 cars that have under hood plugs and in cabin plugs. In short this thing to me was worth every penny and will be paid back in just a short time in the amount of time it saves me plus the functions I would normally send out to the dealer to have performed like key code, module initializing ,and immobilizer. I purchased mine from etooldirect and was pleased with there customer service.
So if you think the launch x431 diagun is good , I suggest you go online to find the chinese auto scanner store to get the x431 diagun.