This article mainly introduces how to solve the problem of intermittent alarm and speed limit of 1400RPM when the DX60-9C excavator engine is working.

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 1) Check the instrument panel fault code to display E001382-31C engine speed limit 140ORPM. ; 

 2) Query the meaning of the code through the fault code table: fuel filter element pressure sensor 

identification error; 

 3) Check the voltage value of the three wires of the fuel filter element pressure sensor. Under normal 

conditions, it should be: 0.85W4.9V/0.85L OV/0.85GR 2.3V when normal, when the engine alarms ov. 

 4) By comparing with the new car, we found that the 0.85GR line should always be around 2.4V, but 

when the fault code appears on this car, it is always OV, so it is suspected that the terminal is short-

circuited to ground.

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grounded. After the grounding point was re-bandaged, it worked normally.