LAUNCH X-431IV English User’s Manual
1
Safety Precautions
Precautions on Operating
Vehicle’s ECU
Do not disconnect the vehicle inner
consumer when the ignition switch is on.
High voltage transients may encounters at
the moment of disconnecting, and thus may
damage sensors and ECU.
Protect the computer from magnetic object
(such as wireless speaker)
Do cut off the power supply of ECU system
before welding on the vehicle.
Pay more attention to ECU and sensors
when operation is next to them.
Ground yourself when you disassemble
PROM, otherwise ECU and sensors will be
damaged by static.
Do not use the pointer ohmmeter instead of
DMM for testing ECU and sensor without
special requirement.
Do not test electric devices in relation with
ECU with a test lamp unless otherwise
expressly provided.
Do wear a metal ground strip that one end
around your wrist and the other to the
vehicle body when you get in and out the
vehicle.
Do connect ECU harness connector firmly,
otherwise electro elements, such as IC
inside ECU, will be damaged.
Precaution on Operation
The X-431IV is a sophisticated electronic
device, never have it clashed when in use.
Main unit screen may flash at the moment
engine ignition, it’s normal.
You may unplug the main unit if the
program cannot be actuated or confused
screen occurs. Plug again to continue the
operation.
Make sure that the X-431IV is properly
connected to the DIAGNOSTIC
CONNECTOR to avoid communication
interruptions.
X-431IV is equipped with a leather Strap for
easy handling when traveling or taking it
into a car shop.
Be careful when plugging and unplugging
the main cable and diagnostic connector.
Tighten the screw before operation to avoid
unexpected disconnecting and/or damage
to the port.
Do not insert and pull out CF card when the
X-431IV is working. Press ejector button to
pull out the card. Insert the CF in the right
place, keep the face labeled “UPSIDE”
upward, and make sure the card is fully
seated.
Handle with care and avoid crash. Unplug
the power after operation.
Put the stylus into the slot at back of
X-431IV main unit after operation, and
place the cables, connectors and other
accessories into box.
Hold the connector and do not pull the
power cord when unplug it.
Use the Cigarette lighter cable to power up,
only from the tested vehicle to prevent the
ECU from being damaged
Precautions on Vehicle
Automotive batteries contain sulfuric acid
that is harmful to skin. In operation, direct
contact with the automotive batteries should
be avoided. Pay attention not to splash the
sulfuric acid into eyes. Keep ignition
sources away from the battery at all times.
Engines produce various poisonous
compounds (hydrocarbon, carbon
monoxide, azotes oxides, etc,), which
should be avoided.
Avoid contacting high temperature
assembly such as water tank and vent-pipe,
as the temperature of the running engine is
very high.
Before starting engine, put the speed lever
in the neutral position or in the P position to
avoid injury.
Wear an ANSI-approved eye shield when
testing or repairing vehicles.
If you are using the battery as a power
source, connect the RED (+) battery clip to
the positive of the vehicle battery and the
BLACK (-) battery clip to the negative.
