Komatsu PC88MR-10 Shop Manual page 779

No. Cause
Defective engine
8
controller
Defective engine
9
controller
Defective machine
10
monitor
PC88MR-10
Procedure, measuring location, criteria, and remarks
If failure code [DA2RKR] is also displayed.
a Disconnect pump controller and engine controller one by one from CAN
communication line to determine which controller is defective.
1. Turn starting switch to OFF position, and set battery disconnect switch to
OFF position.
2. Disconnect engine controller (connector J1).
3. Turn battery disconnect switch to ON position, and turn starting switch to
ON position.
Does either or both of failure codes [DA2RKR] and
[DB2RKR] disappear?
If no failure is found by above checks, engine controller is defective.
(Since this is an internal defect, troubleshooting cannot be performed.)
If no failure is found by above checks, machine monitor is defective.
(Since this is an internal defect, troubleshooting cannot be performed.)
40 Troubleshooting
Troubleshooting by failure code (Display of code)
If YES, engine controller
is defective.
40-291