Komatsu PC88MR-10 Shop Manual page 806

40 Troubleshooting
Troubleshooting by failure code (Display of code)
No. Cause
Open circuit in wiring harness
3
(wire breakage or defective
contact of connector)
Ground fault in wiring harness
4
(contact with ground circuit)
Hot short circuit in wiring
harness
5
(contact with 24 V circuit)
Defective pump controller
6
Circuit diagram related to arm OUT PPC pressure sensor
40-318
Procedure, measuring location, criteria and remarks
1. Turn starting switch to OFF position.
2. Disconnect connectors CP01 and P02, and connect T-adapters to
each female side.
a If power supply voltage measured in check
on cause 1 is normal, this check is not
required.
Between CP01 (female) (18) and P02 (female)
(1)
Between CP01 (female) (51) and P02 (female)
Resis-
(2)
tance
a If power supply voltage measured in check
on cause 1 is normal, this check is not
required.
Between CP01 (female) (6) and P02 (female)
(3)
1. Turn starting switch to OFF position.
2. Disconnect connectors CP01 and P02, and connect T-adapter to
either female side.
Between ground and CP01 (female) (51) or
Resis-
P02 (female) (2)
tance
1. Turn starting switch to OFF position.
2. Disconnect connector P02.
3. Connect T-adapters to female side of connector P02.
4. Turn starting switch to ON position.
Voltage Between P02 (female) (2) and ground
If no failure is found by above checks, pump controller is defective.
(Since this is an internal defect, troubleshooting cannot be performed.)
Max. 1 z
Max. 1 z
Max. 1 z
Min. 1 Mz
Max. 1 V
PC88MR-10