Failure Code [7Rf4Ka] Disconnection In Feeder Forward Epc Valve - Komatsu Galeo BR380JG-1E0 Shop Manual

SEN02090-00

Failure code [7RF4KA] Disconnection in feeder forward EPC valve

User code Failure code
— 7RF4KA
Contents of
• Open circuit is detected when the EPC valve solenoid for feeder forward rotation is driven.
trouble
• Turns the output to the feeder forward EPC valve solenoid circuit OFF.
Action of
• Even if the cause of the failure disappears, the system does not reset itself until the starting switch is
controller
turned OFF.
Problem that
• The feeder does not operate forward.
appears on
• When this trouble is detected, the horn sounds (3 times intermittently).
machine
• Feeder forward EPC valve solenoid drive current can be checked with the monitoring function
(Code: 24700, Feeder FWD EPC Curr.)
Related
• Since the controller detects disconnection while the solenoid output is turned ON, be sure to turn the
information
solenoid output ON when checking for reproduction of the failure after repair.
• The failure history is recorded.
Defective feeder for-
ward EPC valve sole-
1 noid
(Internal disconnec-
tion)
Disconnection in wiring
Possible
harness
causes and
(Disconnection in wir-
standard value
2
ing harness or defec-
in normal state
tive contact in
connector)
Defective work equip-
3 ment and pump con-
troller
Circuit diagram related to feeder forward EPC solenoid
46
Disconnection in feeder forward EPC valve
Trouble
(Work equipment and pump controller (work equipment control) system)
Cause Standard value in normal state/Remarks on troubleshooting
a Prepare with engine starting switch OFF, then carry out troubleshooting
without turning engine starting switch ON.
a Prepare with engine starting switch OFF, then carry out troubleshooting
without turning engine starting switch ON.
Wiring harness between C03 (female) (38), A01
and V03 (female) (2)
Wiring harness between C03 (female) (13), (23),
A01 and V03 (female) (1)
a Prepare with engine starting switch OFF, then carry out troubleshooting
without turning engine starting switch ON.
Between (38) and (13), (23)
V03 (male)
Between (1) and (2)
C03 (female)
40 Troubleshooting
1
Resistance
7 – 14 z
Resistance Max. 1 z
Resistance Max. 1 z
Resistance
7 – 14 z
BR380JG-1E0