Komatsu PC500LC-10R, Shop Manual, Page: 570 / 758

If calibration is finished unsuccessfully, “NG” is displayed
for the State of Adjustment and the failure cause code is
displayed. Referring to the failure cause codes in Table 1,
find out and remove the cause and repeat calibration.
Table 1. Failure cause codes (Displayed in descending order of priority)
Cause code Content Required action
A-1 Engine speed signal is 0 rpm. Check that engine is started.
A-2 Hydraulic oil temperature is low. Check the hydraulic oil temperature (Max. 45 °C)
A-3 Hydraulic oil temperature is high. Check the hydraulic oil temperature (Min. 55 °C)
A-4 Overheating Check for overheating
A-6 Pump pressure sensor (F, R) is defective.
Perform troubleshooting for pump pressure sen-
sor.
A—8 Arm IN PPC pressure sensor is defective.
Perform troubleshooting for the arm IN PPC
pressure sensor
A-9 PC-EPC is abnormal. Perform troubleshooting for PC-EPC.
A-A
Defective CAN communication (Eng, Monitor,
Pump)
Perform troubleshooting for CAN.
A-B Bucket CURL PPC pressure sensor is faulty.
Perform troubleshooting for the bucket CURL
PPC pressure sensor.
C-3 Fuel control dial is not at MAX position.
Check that the fuel control dial is in MAX posi-
tion.
E-1
When the oil pressure in arm IN circuit is re-
lieved, arm IN PPC pressure is below specified
value or arm IN PPC pressure sensor is within
the normal range. (*1)
Check the arm IN lever is set to full stroke.
E-2 Pump pressure (F, R) is out of specified range.
Perform troubleshooting for relief valve and
pump.
E-3 Engine speed is out of specified range. Check the high idle engine speed
E-4 Engine torque is out of specified range. Perform troubleshooting for engine and pump.
E-5 PC-EPC current is out of specified range. Perform troubleshooting for PC-EPC current.
E-6
When bucket CURL is relieved, bucket CURL
PPC pressure is below specified value or bucket
CURL PPC pressure is within the normal range.
(*1)
Check the bucket CURL lever is set to full
stroke.
E-7 The working mode is neither P nor ATT/P. Set the working mode to P or ATT/P.
E-A Turn on the air conditioner. Check that the air conditioner is turned off.
*1: When the sensor voltage is out of the normal range (0.5 to 4.5 V), the pump controller recognizes the relief
pressure to be 0 MPa {0 kg/cm
2
} . Accordingly, perform troubleshooting by referring to the Troubleshooting (Fail-
ure codes [DHPAMA] and [DHPBMA]).
SET AND OPERATE MACHINE MONITOR 30 TESTING AND ADJUSTING
30-164 PC500LC-10R