User Manual

LAUNCH X-431 V+ User Manual — Vehicle Diagnosis
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to reset the service lamp.
Steering Angle Calibration
1. 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.
2. 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.
Electronic Parking Brake Reset
1. If the brake pad wears the brake pad sense line, the brake pad sense line
sends a signal sense line to the on-board computer to replace the brake pad.
After replacing the brake pad, you must reset the brake pad. 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.
Electronic Throttle Position Reset/Learn
This function enables you to initialize the throttle actuators so that the “learned”
values stored on ECU are returned to the default state. Doing so can accurately
regulate throttle (or idle engine) operations to control the amount of air intake.
Throttle matching must be performed in the following cases:
a) The ECU is replaced and the ECU does not yet store throttle working
features.
b) The ECU is disconnected from power and the ECU memory is lost.
c) The throttle assembly is replaced.
d) The intake pipe is replaced or removed, which affects idle speed control by
ECU and throttle body.
e) The throttle is cleaned. Although the idle throttle potentiometer features
remains unchanged, with the same throttle opening, the air inflow has
changed and idle speed control features have changed.