Komatsu PC88MR-10 Shop Manual page 794

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 Bucket CURL PPC pressure sensor
40-306
Procedure, measuring location, criteria and remarks
1. Turn starting switch to OFF position.
2. Disconnect connectors CP01 and P04, 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 P04 (female)
(1)
Between CP01 (female) (69) and P04 (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 P04 (female)
(3)
1. Turn starting switch to OFF position.
2. Disconnect connectors CP01 and P04, and connect T-adapter to
either female side.
Between ground and CP01 (female) (69) or
Resis-
P04 (female) (2)
tance
1. Turn starting switch to OFF position.
2. Disconnect connector P04.
3. Connect T-adapters to female side of connector P04.
4. Turn starting switch to ON position.
Voltage Between P04 (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