LAUNCH X-431 V V4.0 User Manual
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This function is used to read the version information of system mode, vehicle
VIN, software and ECU.
B. Read Fault Code
This function displays the detailed information of DTC records retrieved from the
vehicle’s control system.
Caution: Retrieving and using DTCs for troubleshooting vehicle operation is only
one part of an overall diagnostic strategy. Never replace a part based only on the DTC
definition. Each DTC has a set of testing procedures, instructions and flow charts that
must be followed to confirm the location of the problem. This information can be found
in the vehicle’s service manual.
On the test function selection screen, tap “Read Fault Code”, the screen will
display the diagnostic result.
On-screen Buttons:
Freeze Frame: When an emission-related fault occurs, certain vehicle
conditions are recorded by the on-board computer. This information is referred
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