Komatsu PC88MR-10 Shop Manual page 646

40 Troubleshooting
Troubleshooting by failure code (Display of code)
No. Cause
Defective other cylinder
7
injectors or wiring harness
Defective engine controller
8
Circuit diagram related to injector #1
40-158
Procedure, measuring location, criteria, and remarks
If failure codes of other injectors are displayed, perform troubleshooting
for them first.
If no failure is found by above checks, engine controller is defective.
(Since this is an internal defect, troubleshooting cannot be performed.)
PC88MR-10