Gear Learning; Immo Service; Injector Coding; Battery Maintenance System Reset - Launch X-431 User Manual

LAUNCH
TPMS replacement and sensor test.
1. After the tire pressure MIL turns on and maintenance is performed, the tire pressure resetting function
must be performed to reset tire pressure and turn off the tire pressure MIL.
2. Tire pressure resetting must be performed after maintenance is performed in the following cases: tire
pressure is too low, tire leaks, tire pressure monitoring device is replaced or installed, tire is replaced, tire
pressure sensor is damaged, and tire is replaced for the car with tire pressure monitoring function.

3.3.6 Gear Learning

The crankshaft position sensor learns crankshaft tooth machining tolerance and saves to the computer to
more accurately diagnose engine misfires. If tooth learning is not performed for a car equipped with Delphi
engine, the MIL turns on after the engine is started. The diagnostic device detects the DTC P1336 'tooth not
learned'. In this case, you must use the diagnostic device to perform tooth learning for the car. After tooth
learning is successful, the MIL turns off.
After the engine ECU, crankshaft position sensor, or crankshaft flywheel is replaced, or the DTC 'tooth not
learned' is present, tooth learning must be performed.

3.3.7 IMMO Service

An immobilizer is an anti-theft mechanism that prevents a 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.

3.3.8 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.

3.3.9 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:
a) 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.
b) 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 panel.
54
Station
User's Guide
www.x431.com +86 755 8455 7891