Failure Code [Dxe7Ka] Attachment Flow Regulating Epc 2 Solenoid Open Circuit - Komatsu PC88MR-10 Shop Manual

40 Troubleshooting
Troubleshooting by failure code (Display of code)
Failure code [DXE7KA] Attachment Flow Regulating EPC 2 Solenoid
Open Circuit
(PC88MR-DXE7KA-400-A-Z0-A)
Action level Failure code
DXE7KA
When attachment flow rate adjustment EPC2 solenoid is driven, no current flows in the
Details of
circuit, so the open circuit is detected.
failure
a Attachment flow rate adjustment EPC2 is ATT flow rate adjustment EPC2.
Stops driving attachment flow rate adjustment EPC2 solenoid.
Also sets output command to attachment flow rate adjustment EPC5 solenoid to 0 mA.
Action of
Even if cause of failure disappears, machine does not become normal until starting switch
controller
is turned to OFF position.
Problem on
Attachment does not move.
machine
Drive current of attachment flow rate adjustment EPC2 solenoid can be checked with
monitoring function.
Related
(Code: 01702)
information
Method of reproducing failure code: Turn starting switch ON and set machine in
attachment mode (ATT).
No. Cause
Defective attachment
flow rate adjustment
1
EPC2
(Internal open circuit)
Open circuit in wiring
harness
2
(Wire breakage or
defective contact of
connector)
Pump controller is
3
defective.
40-356
Attachment Flow Regulating EPC 2 Solenoid Open Circuit
Failure
(Pump controller system)
Procedure, measuring location, criteria, and remarks
1. Turn starting switch to OFF position.
2. Disconnect connector V92, and connect T-adapter to male side.
Resistance Between V92 (male) (1) and (2)
1. Turn starting switch to OFF position.
2. Disconnect connectors CP02 and V92, and connect T-adapters to each
female side.
Between CP02 (female) (110) and V92 (female) (1) Max. 1 z
Resistance Between each of CP02 (female) (115), (117), (120)
and V92 (female) (2)
If no failure is found by above checks, pump controller is defective.
(Since this is an internal defect, troubleshooting cannot be performed.)
7 to 14 z
Max. 1 z
PC88MR-10