WCM CTX8010C, Operations & Parts Manual

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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
The fuel pump system does not
supply fuel or supply less fuel
Low engine rpm Adjust to regular rpm
Pump fault Change
Less fuel in the tank Add fuel
Fuel tube breaks, tube connector is loose
and O ring is damaged
Change
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)
2 Fuse F1 and F11 fail
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.
3
Engine ignition
switch fault
★
Turn the start switch of engine to OFF as preparation and keep it at OFF
during diagnosis.
Ignition switch Position Resistance
Between 30 and 17
OFF 1MΩ
Start Below 1Ω
4 Starter relay K3 fault
★
Turn the start switch of engine to OFF as preparation and keep it at OFF during
diagnosis.
Pin Resistance
85-86 200-400Ω
87-30
Above
1MΩ
87a-30 Below 1Ω
5
Security lock switch
fault (open circuit
inside)
★
Turn the start switch of engine to OFF as preparation and keep it at OFF during
diagnosis.
Lock rod Resistance