Users Manual Part 2

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MDMAXLITEA
vehicle’s engine from starting unless the correct ignition
key or other device is present. Most new vehicles have an
immobilizer as standard equipment. An important advantage
of this system is that it doesn’t require the car owner to
activate it since it operates automatically. An immobilizer
is considered as providing much more effective anti-theft
protection than an audible alarm alone.
As an anti-theft device, an immobilizer disables one of the
systems needed to start a car’s engine, usually the ignition
or the fuel supply. This is accomplished by radio frequency
identification between a transponder in the ignition key and a
device called a radio frequency reader in the steering column.
When the key is placed in the ignition, the transponder
sends a signal with a unique identification code to the reader,
which relays it to a receiver in the vehicle’s computer control
module. If the code is correct, the computer allows the fuel
supply and ignition systems to operate and start the car. If
the code is incorrect or absent, the computer disables the
system, and the car will be unable to start until the correct
key is placed in the ignition.
To prevent the car being used by unauthorized keys, the
anti-theft key matching function must be performed so that
the immobilizer control system on the car identifies and
authorizes remote control keys to normally use the car.
When the ignition switch key, ignition switch, combined
instrument panel, ECU, BCM, or remote control battery is
replaced, anti-theft key matching must be performed.
5.3.7 Injector Coding
Write injector actual code or rewrite code in the ECU to the
injector code of the corresponding cylinder so as to more
accurately control or correct cylinder injection quantity.
After the ECU or injector is replaced, injector code of each
cylinder must be confirmed or re-coded so that the cylinder
can better identify injectors to accurately control fuel
injection.
5.3.8 Battery Maintenance System Reset
This function enables you to perform a resetting operation on
the monitoring unit of vehicle battery, in which the original
low battery fault information will be cleared and battery
matching will be done.
Battery matching must be performed in the following cases:
1) Main battery is replaced. Battery matching must be
performed to clear original low battery information and
prevent the related control module from detecting false
information. If the related control module detects false
information, it will invalidate some electric auxiliary
functions, such as automatic start & stop function,
sunroof without one-key trigger function, power window
without automatic function.
2) Battery monitoring sensor. Battery matching is performed
to re-match the control module and motoring sensor to
detect battery power usage more accurately, which can
avoid an error message displaying on the instrument