Komatsu PC200-8M0, Shop Manual, Page: 800 / 1254

305 Troubleshooting by failure code, Part 5
Failure code [DXE4KA] Attachment Flow EPC Open Circuit
40-305
28
PC200, 200LC, 220, 220LC-8M0
SEN06137-00
Failure code [DXE4KA] Attachment Flow EPC Open Circuit
Action
level
Failure code
Failure
Attachment Flow EPC Open Circuit.
(Pump controller system)
– DXE4KA
Detail of failure q When service flow throttle EPC solenoid is driven, no current flows and ope circuit is detected.
Action of con-
troller
q
None in particular (Since no current flows, solenoid is not energized.)
q If cause of failure disappears, machine becomes normal by itself.
Problem on
machine
q Attachment does not move.
Related infor-
mation
q Drive current of service current EPC solenoid can be checked with monitoring function.
(Code: 01700 Service solenoid current)
q Method of reproducing failure code: Turn starting switch ON and set machine in breaker mode (B).
Cause Procedure, measuring location, criteria and remarks
1
Defective attachment flow rate
adjustment (service current) EPC
solenoid (Internal open circuit)
1. Turn starting switch to OFF position.
2. Disconnect connector V30, and connect T-adapters to male side.
Between V30 (male) (1) and (2) Resistance 3 to 14
z
2
Open or short circuit in wiring har-
ness
1. Turn starting switch to OFF position.
2. Disconnect connector C02 and connect T-adapters to female side.
Between C02 (female) (97) and each of (115), (117)
and (120)
Resistance 3 to 14
z
3
Open circuit in wiring harness
(wire breakage or defective con-
tact of connector)
a
If no failure is found by check on cause 2, this check is not required.
1. Turn starting switch to OFF position.
2. Disconnect connectors C02 and V30, and connect T-adapters to each
female side.
Between C02 (female) (97) and V30 (female) (1) Resistance Max. 1
z
Between V30 (female) (2) and each of C02 (female)
(115), (117) and (120)
Resistance Max. 1
z
4 Defective pump controller
If no failure is found by above checks, pump controller is defective. (Since this
is an internal defect, troubleshooting cannot be performed.)