In case our customer face x431 diagun issue and do not know how to solve the problem, Here we’d like to list FAO trobleshooting X431 issue for our customer refer:
Q1:Why is my screen blank after I power on the machine?
A: Remove the CF card and restart the machine to see if there is a normal display. If the dis-
play is normal when the CF card is taken out, the CF card should be replaced. If the
screen is still blank, contact your local dealer for assistance.
Q2:Why won’t my unit power up?
A: Make sure the connector is firmly connected to both the unit and the vehicle. In addition,
make sure that the CF card is in the machine. If the unit still refuses to power up, contact
your local dealer for assistance.
Q3: Why does the LCD touch-screen respond so slowly?
A: It is most likely because the temperature in your location is close to the lower limit of the
operating temperature range of the unit (0°-50°C). If this is the case, warm up the unit for
10-20 minutes before operating.
Q4: Why can’t I see the information on the screen clearly when the ambient light is not
A: Locate the light bulb icon on the lower right corner of the touch screen. Click it to turn the
Q5: Why can’t I see characters on the backlit screen?
A: Check to see if the power is firmly connected. If so, turn off the machine, unplug the
power connector and re-plug it back in. Turn on the machine after it has been connected
to a power source for at least 2 seconds.
Q6: The screen is too white, I cannot see the display. How do I adjust the contrast?
A: In the Control Panel interface, click the ‘Contrast’ icon to open the Contrast Interface.
Click the position you want, and then click ‘OK’.
Q7:Why does the screen either not respond, or respond incorrectly when I click it with the sty-
lus (included pointing device). How do I realign the screen to correct the situation?
A: It necessary to realign or recalibrate the screen. Follow these steps to initialize the cali-
1. After switching on the machine, follow the tips to press the hot key. The calibration
interface will be opened.
2. Click the cross cursor on the screen accurately (precisely in the center of the cross),
and wait until it changes. The cross-cursor will then move to each of the four corners.
3. Repeat the process of clicking in the center of each cross-cursor until the process fin-
ishes. The screen will then return to the main interface.
Q8: Why can’t I input data using the Soft Keyboard (on-screen keyboard)?
A: Either the position where the cursor lies cannot be edited, or you haven’t activated the
cursor on the input position. Use the stylus to select the field you wish to edit. When the
cursor blinks, you can input the data.
Q9: Why is the screen inactive after the cross-cursor appears on the screen? How do I
adjust the screen?
A: The system is calibrating the touch screen. The machine will work after this calibration is
completed. Refer to the section “Calibrate Touch Screen” in your User’s Manual.
Q10:Why can’t I click any of the buttons on the screen? I’m pressing the ‘Start’ button,
but nothing is happening.
A: You need to adjust the touch screen. When the machine powers up, press the ‘Hot Key’
located just abover the ‘Power button’. You will see a cross-cursor appear on the screen.
(You may need to press the ‘Hot button’ twice on some machines) Click the center of the
cross-cursor with your stylus or pointing device. The cross-cursor will then move to each
of the four corners of the screen, continue clicking the center of each as they appear. This
completes the adjustment or calibration of the screen. You should now be able to click the
If you have read the above tips, then congratulation, you have know how to solve car diagnostic tool problems by youself.