Komatsu PC88MR-10 Shop Manual page 899

No. Cause
Defective machine
2
monitor
Pump controller is
3
defective.
Defective engine
4
controller
PC88MR-10
Procedure, measuring location, criteria, and remarks
If no failure is found by preceding checks, machine monitor may be defective.
(Since this is an internal defect, troubleshooting cannot be performed.)
If no failure is found by preceding checks, pump controller may be defective.
(Since this is an internal defect, troubleshooting cannot be performed.)
If no failure is found by preceding checks, engine controller may be defective.
(Since this is an internal defect, troubleshooting cannot be performed.)
40 Troubleshooting
Troubleshooting of electrical system (E-mode)
40-411