The water temperature of the engine is believed to be one of the most important points of concern for the hands of the machines. Different from the frequent faults in the summer water temperature, to the cold winter, everyone seems to be able to breathe a great deal of breath, but the excavator will still show the phenomenon of high and abnormal water temperature.
What needs to be noticed is that if the water temperature is abnormal, it is not necessarily the water temperature sensor failure, and may be other components, the following modern excavator repair brick home teach you a omnipotent method to test the fault!
General situation
If the temperature of the excavator is abnormal, we need to check the following situations.
First, we first separate the signal line of the engine water temperature sensor from the water temperature sensor. At this time, we should first view the water temperature meter of the dashboard, and if it flashes in the first section, it indicates that the meter is normal.
Two, we connect the signal line to the ground (the iron or the power supply negative), at this time check the dashboard relative to the water temperature meter display, if displayed in the ten (or full grid state), also proved that the instrument is normal. (Note: the water temperature alarm has a delay function, please wait time in operation for more than 20 seconds).
Therefore, when the above situation is detected, the signal lines and instruments of the excavator are all normal, and then the water temperature sensor can be judged to be damaged according to the failure phenomenon, as long as the new one can be replaced.
Abnormal condition
If our examination results are not consistent with the above situation, we should divide them into the following situations:
[first] the water temperature sensor signal line is connected to the ground (the iron or the power supply negative), at this time the dashboard corresponding to the water temperature meter has been in the first section and flickers, the reason is the water temperature sensor signal circuit breakage (broken line) or the bad contact.
Check the signal line of the water temperature sensor (which can be checked by multimeter). If the signal line is in contact with normal, it is necessary to change the meter to determine the instrument fault.
[Second] the signal line of the engine water temperature sensor is separated from the water temperature sensor, if the dashboard corresponds to the water temperature meter at the tenth grid position, the reason is the short circuiting of the signal line (connected with the line and the frame).
Check the signal line of the water temperature sensor (which can be checked by multimeter) at this time. If the signal line is not short circuited, the fault of the instrument can be replaced.
[Third] the signal line of the engine water temperature sensor is separated or grounded from the water temperature sensor (the iron or the power supply negative), and the dashboard corresponds to the water temperature meter at any position in the second lattice to nine lattices.
This is due to the bad contact of the signal line or the failure of the instrument. If the contact condition of the signal line is checked normally, it is determined to be the failure of the dashboard, and it can be restored to normal as long as the instrument is replaced.
Summary of brick home
See here believe everyone has learned how to check and repair it, winter itself engine water temperature high fault does not often appear, once everyone found that the engine water temperature shows abnormal, it is not necessarily a sensor problem, but also may be instrument display, line and so on.
The best and most practical way is to check the above process carefully and carefully, and the trouble can be easily solved.
