LAUNCH X-431IV English User’s Manual
47
(interfaces) opened.
Question:
Why can’t I do operation in current
interface?
Answer:
There are two possible causes:
1. Your current interface has exited illegally. In
this situation, you may not see the name of the
application (interface) in the pop-up list when
you click the active taskbar icon.
2. The system is busy, please wait patiently, or
click the active taskbar icon to switch to another
application.
6.5 Questions Related to Vehicle
Question:
Why does the screen flickers during
engine starting?
Answer:
It is caused by the electromagnetic
interference. No problem with X-431IV.
Question:
Why is operation interrupted during
diagnosis?
Answer:
It may be caused by electromagnetic
interference or incorrect connection of
connector.
Question:
Why is there no response from
vehicle ECU at communication?
Answer:
Make sure that the voltage of vehicle
battery, ignition timer and idle speed are in
standard range; the throttle is in the closed
position; and all electric devices, such as A/C,
headlight, stereos etc, are turned off. Refer to
the section “Conditions for Test”.
Question:
Some systems cannot be diagnosed.
Why?
Answer:
The diagnostic socket for the system
on some early vehicle may be separated. Refer
to the vehicle instruction manual.
Question:
No trouble code is found. Why?
Answer:
It may be caused by the shared circuit.
Find the nearest trouble code and circuit for
analysis.
Question:
Why are there too many trouble
codes?
Answer:
It may be caused by poor contact or
poor grounding. Make sure that the vehicle
model/year is selected correctly and the vehicle
is equipped with the system.
