WCM CTX8010C Operations & Parts Manual page 49

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 fuel pump system does not
supply fuel or supply less fuel
Possible causes
1 Low battery
2 Fuse F1 and F11 fail
Engine ignition
3
switch fault
4 Starter relay K3 fault
Security lock switch
5 fault (open circuit
inside)
Section IV Troubleshooting of electrical control system
Fuel tube breaks, tube connector is loose
and O ring is damaged
Standard value in regular condition and reference value of fault diagnosis
Battery voltage
Above 12V
In case the fuse is burnt, the GND fail may happen.
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.
Ignition switch
Between 30 and 17
★Turn the start switch of engine to OFF as preparation and keep it at OFF during
diagnosis.
Pin
85-86
87-30
87a-30
★Turn the start switch of engine to OFF as preparation and keep it at OFF during
diagnosis.
●The engine fails to start
Low engine rpm
Pump fault
Less fuel in the tank
Color of charge state densimeter
Green (if it is white, change the battery)
43
Adjust to regular rpm
Change
Add fuel
Change
Position
OFF
Start
Lock rod
Resistance
1MΩ
Below 1Ω
Resistance
200-400Ω
Above
1MΩ
Below 1Ω
Resistance