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speedometer stopped working while driving
Many cars now use the ABS wheel speed sensor signal as the vehicle speed signal source. There is a wheel speed sensor on each wheel, and the ABS control system collects their data to judge the wheel lock situation. At the same time, this data is also used by the speedometer. When the speedometer cannot be displayed, it is most likely that the ABS system has a problem and cannot send the wheel speed signal.The speed sensor, the plug is not inserted firmly, and the circuit is disconnected, etc., which will cause the speedometer to not go.
From the odometer, you can know how many kilometers have been traveled this time, and can also remember how many kilometers have been traveled since the factory. There are two types of odometers: electronic odometers and mechanical odometers.Electronic odometer does not go to fault judgment. Open the connector of the transmitter, turn on the ignition switch, the No. 2 electrode is connected to the red line on the brown bottom in the connector, extend it out with a self-made wire with a plug, and make a virtual stroke on the grounding part of the body, Input the pulse signal to the meter, if the pointer of the speedometer rotates at this time, it means that the meter is normal, and the fault occurs on the sensor reed switch tube or the magnetic ring. At this time, if the pointer of the speedometer does not rotate, it means that the instrument or the connecting line is faulty, and the next step of fault identification can be continued. Practice has proved that the method of virtual scratching the wire to create the pulse stop signal is effective for judging the location of the fault.There is also a mechanical type, a flexible shaft type line, which is connected to the gearbox and the odometer. The inspection is to remove one end of the gearbox side, and turn it by hand if it is not broken. The odometer should have Swing, change the line if it breaks, if the mileage doesn't swing, check one end of the odometer and the odometer itself. In most cases the line is broken.
The speedometer does not work: first, operate according to the above fault judgment method, open the sensor connector and swipe the pulse signal line, and the speedometer pointer does not rotate at this time. Then the instrument panel was removed, and the wiring was measured, and no problem was found. Then carefully check the instrument panel to see if there is any abnormality. It is found that the ground electrode of the speedometer has been welded. After re-welding, the speedometer works normally.
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