NUOMAN NM-E10 MINI - Section IV Troubleshooting of electrical control system

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Section IV Troubleshooting of electrical control system
Fault codes of electrical control system of excavator
The engine fails to start
The engine flames out during operation
The engine fails to flame out
Automatic slow-down does not work
Slewing and traveling of all working devices.
Principle diagram
1. The engine fails to start
Fault description
●The engine fails to start
Low engine rpm
Adjust to regular rpm
The fuel pump system does not
Pump fault
Change
Less fuel in the tank
Add fuel
supply fuel or supply less fuel
Fuel tube breaks, tube connector is loose
Change
and O ring is damaged
Possible causes
Standard value in regular condition and reference value of fault diagnosis
1
Low battery
Battery voltage
Color of charge state densimeter
Above 12V
Green (if it is white, change the battery)
In case the fuse is burnt, the GND fail may happen.
2
Fuse F1 and F11 fail
If he monitoring indicator on the monitor panel is not illuminated, inspect the
circuit between battery and specified fuse.
★ Turn the start switch of engine to OFF as preparation and keep it at OFF
during diagnosis.
Engine ignition
3
Ignition switch
Position
Resistance
switch fault
Between 30 and 17
OFF
1MΩ
Start
Below 1Ω
★Turn the start switch of engine to OFF as preparation and keep it at OFF during
diagnosis.
Pin
Resistance
4
Starter relay K3 fault
85-86
200-400Ω
87-30
Above
1MΩ
87a-30
Below 1Ω
Security lock switch
★Turn the start switch of engine to OFF as preparation and keep it at OFF during
5
fault (open circuit
diagnosis.
inside)
Lock rod
Resistance