Steering Angle Calibration; Abs Bleeding; Tire Pressure Monitor System Reset; Gear Learning - LAUNCH TECH X-431 PRO5 User Manual

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Otherwise, the car alarms.
2. Reset must be performed in the following cases:
a) The brake pad and brake pad wear sensor are replaced.
b) The brake pad indicator lamp is on.
c) The brake pad sensor circuit is short, which is recovered.
d) The servo motor is replaced.

6.3 Steering Angle Calibration

To reset the steering angle, first find the relative zero point position for the car to drive in straight line. Taking this
position as reference, the ECU can calculate the accurate angle for left and right steering.
After replacing the steering angle position sensor, replacing steering mechanical parts (such as steering gearbox,
steering column, end tie rod, steering knuckle), performing four-wheel alignment, or recovering car body, you must
reset the steering angle.

6.4 ABS Bleeding

This function allows you to perform various bi-directional tests to check the operating conditions of Anti-lock Braking
System (ABS).
1. When the ABS contains air, the ABS bleeding function must be performed to bleed the brake system to restore
ABS brake sensitivity.
2. If the ABS computer, ABS pump, brake master cylinder, brake cylinder, brake line, or brake fluid is replaced, the
ABS bleeding function must be performed to bleed the ABS.

6.5 Tire Pressure Monitor System Reset

This function allows you to quickly look up the tire sensor IDs from the vehicle's ECU, as well as to perform 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.

6.6 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.

6.7 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
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X-431 PRO5 User Manual