LAUNCH X-431 PAD III User Manual
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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
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