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OPERATION
TROUBLESHOOTING
IF ACCELERATOR PEDAL HAS FAILED
In addition to the potentiometer detecting the pedal depression depth, the switch (check switch) is installed on the
accelerator pedal assembly in order to detect whether the accelerator pedal is depressed or not.
If the pedal depression depth is not detected correctly due to a failure of the accelerator pedal or incorrect electric
wiring, the engine controller controls the engine speed responding to the signal from this check switch. The engine
runs at 1500 rpm when the accelerator pedal is depressed, while the engine runs at low idle when the pedal is
released. The engine speed varies depending on the load.
After using the accelerator pedal to move the machine to a safe place, check the service code and contact your
Komatsu distributor.
There are two methods when operating the accelerator pedal: either release the pedal (check switch is OFF, low
idle), or depress the pedal fully (1500 rpm).
If the accelerator pedal is held at an intermediate position, the system may not be able to judge if the accelerator
pedal is being operated or not.
REMARK
If the engine controller cannot perform normal reception of the signal of the accelerator pedal depth, the central
warning lamp flashes and simultaneously the alarm buzzer sounds and user code 02 appears.
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