2010-03-02
The customer's machine only worked for less than a hundred hoursHitachi 200 ZX200The excavator experienced a phenomenon where the wiper did not work during operation, but its water spray was normal
Solution:
1) When the key is turned to the "ON" position, press the wiper switch and the wiper does not work. Press the water spray switch and the water spray is normal, but the wiper still does not work.
2) The internal service specific diagnostic function of the computer is normal.
3) Check that the wiper lock switch is functioning properly. The voltage of fuse 20 is normal.
4) Upon inspection, it was found that the gap voltage of Line 80 (motor forward rotation circuit) is normal, while Line 81 (motor reverse rotation circuit) has no voltage
5) Swap the forward rotation relay of the wiper motor and the reverse rotation relay of the wiper motor. Fault and no voltage change on lines 80 and 81
6) Check that the voltage of line 708709 at the end of the electromechanical controller is normal, and there is no voltage on line 710 (it is estimated that the internal program of the electromechanical controller did not control the grounding and electrification)
7) After the above inspection, it is determined that there is a malfunction in the electromechanical controller. After installing the inventory electromechanical controller on top, the wipers and water spray work normally.
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