Komatsu PC88MR-10 Shop Manual page 771

No. Cause
Defective engine
controller, pump
7 controller, air
conditioner unit, or
KOMTRAX terminal
Defective air conditioner
8
controller
Defective engine
9
controller
Defective machine
10
monitor
PC88MR-10
Procedure, measuring location, criteria, and remarks
If all four failure codes [DA2QKR], [DB2QKR], [D8AQKR], and [DAZQKR]
are displayed.
a To identify defective controller, repeat following steps 1. to 3. to disconnect
controllers one by one from CAN communication line.
1. Turn starting switch to OFF position, and set battery disconnect switch to
OFF position.
2. Disconnect CAN communication connector of engine controller (connector
CE03), pump controller (connector CP01), air conditioner unit (connector
AC01), and KOMTRAX terminal (connector CK01) one by one in turn.
3. Turn battery disconnect switch to ON position, turn starting switch to ON
position, then perform troubleshooting.
4. Return to step 1 to check next connector.
Has the number of displayed failure codes
decreased from four?
If no failure is found by above checks, air conditioner controller is defective.
(Since this is an internal defect, troubleshooting cannot be performed.)
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)
controller is defective.
If YES, disconnected
40-283