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speedometer and rpm gauge not working
The reason why the car speedometer and rpm gauge not working:
1. The CAN bus of the ECU is faulty, and the CAN interface of the ECU is in poor contact.
2. Excessive dirt and carbon deposits, abnormal air circulation, inability to accurately control the normal intake air volume, resulting in unstable gas content and making the engine not work well.
3. Low fuel pressure and poor constant pressure performance lead to low atomization level of the system, which makes the car difficult to start.
If it is a mechanical tachometer, it may be that the transmission core wire is broken. The solution is to change a transmission core wire; It is also possible that there is a foreign matter stuck in the watch and it cannot be moved, so just disassemble it and remove the foreign matter inside. The specific functions of the automobile engine tachometer are as follows:
1. Observe whether the automobile is started. When the automobile is not running, it will be in idle state. At this time, the pointer of the tachometer will not be at 0, but at more than 700 revolutions. Therefore, it is impossible to determine whether the vehicle has started at any time, just look at the tachometer.
2. Determine the shift time. In the past, many people would shift gears according to the sound of the engine. But now, with the quietness of the whole vehicle getting better and better, start the engine. The sound of the machine is almost inaudible. The most correct method is to determine according to the engine speed. You can know the shift time by looking at the tachometer.
3. There is a red zone on the tachometer indicating the safe operation area of the engine. Generally, the speed in the red zone will be above 6000 rpm. For the engine, maintaining the high speed for a long time will lead to poor lubrication performance of the engine, and the burden of the cooling system is also large. If the state of the dry red area is kept for a long time, all parts of the dry engine will be damaged to a certain extent. Therefore, according to the safety area of the engine tachometer judges the condition of the engine.
4. The function of the engine tachometer to check whether there is a problem with the car: it can reflect the problems of many cars. Many experienced riders or maintenance technicians can judge whether there is a problem with the car by the movement of the tachometer pointer when the engine is idling, such as carbon deposit, throttle valve, spark plug, ignition coil, etc.
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