Failure Code [Dxa8Ka] Pc-Epc (F) Sol Open Circuit - Komatsu PC200-8M0 Shop Manual

SEN06137-00

Failure code [DXA8KA] PC-EPC (F) Sol Open Circuit

Action
Failure code
level
L03 DXA8KA
q
Detail of failure When PC-EPC (Front) solenoid is driven, no current flows and open circuit is detected.
q
Action of con- None in particular (Since no current flows, solenoid is not energized.)
q
troller If cause of failure disappears, machine becomes normal by itself.
Problem on
q
If pump load increases, engine speed decreases largely and engine may stall.
machine
q
When solenoid and wiring harness are normal, engine can be prevented from stalling by setting
emergency pump drive switch to ON position.
Related infor-
q
Drive current of PC-EPC (F) solenoid can be checked with monitoring function.
mation
(Code: 01300 PC-EPC solenoid current (F))
q
Method of reproducing failure code: Turn starting switch to ON position.
Cause
Defective PC-EPC (F) solenoid
1
(Internal open circuit)
Defective emergency pump drive
2 switch
(Internal open circuit)
Open or short circuit in wiring har-
3
ness
Open circuit in wiring harness
4 (wire breakage or defective con-
tact of connector)
5 Defective pump controller
16
40-305
PC-EPC (Front) Solenoid Open Circuit
Failure
(Pump controller system)
Procedure, measuring location, criteria and remarks
1. Turn starting switch to OFF position.
2. Disconnect connector V11, and connect T-adapters to male side.
Between V11 (male) (1) and (2)
1. Turn starting switch to OFF position.
2. Disconnect connector S25 and connect T-adapters to male side.
Between S25 (male) (3)
and (2)
Between S25 (male) (6)
and (5)
1. Turn starting switch to OFF position.
2. Disconnect connector C02 and connect T-adapters to female side.
a Check that emergency pump drive switch is at normal position (lower side).
Between C02 (female) (96) and each of (115), (117)
and (120)
a If no failure is found in checks on cause 3, this check is not required.
1. Turn starting switch to OFF position.
2. Disconnect connectors C02, S25 and V11, and connect T-adapters to each
female side.
Between C02 (female) (96) and S25 (female) (3)
Between S25 (female) (2) and V11 (female) (1)
Between S25 (female) (6) and each of C02 (female)
(115), (117) and (120)
Between S25 (female) (5) and V11 (female) (2)
If no failure is found by above checks, pump controller is defective. (Since this
is an internal defect, troubleshooting cannot be performed.)
305 Troubleshooting by failure code, Part 5
Failure code [DXA8KA] PC-EPC (F) Sol Open Circuit
Switch position: Normal Resistance
Switch position: Emer-
gency
Switch position: Normal Resistance
Switch position: Emer-
gency
PC200, 200LC, 220, 220LC-8M0
3 to 14 z
Resistance
Max. 1 z
Resistance Min. 1 Mz
Max. 1 z
Resistance Min. 1 Mz
3 to 14 z
Resistance
Max. 1 z
Resistance
Max. 1 z
Resistance
Max. 1 z
Resistance
Max. 1 z
Resistance