Failure Code [Dxa8Kb] Front Pump Pc-Epc Solenoid Short Circuit - Komatsu PC88MR-10 Shop Manual

40 Troubleshooting
Troubleshooting by failure code (Display of code)

Failure code [DXA8KB] Front Pump PC-EPC Solenoid Short Circuit

DXA8KB-400-A-Z0-A)
Action level Failure code
L03 DXA8KB
Detail of Abnormal current flows when pump controller drives PC-EPC solenoid, so pump
failure controller determines that short circuit exists in PC-EPC solenoid circuit.
Stops driving PC EPC solenoid.
Action of
Even if cause of failure disappears, machine does not become normal until starting switch
controller
is turned to OFF position.
Problem on
If pump load increases, engine speed decreases largely and engine may stall.
machine
When solenoid and wiring harness are normal, engine can be prevented from stalling by
setting pump secondary drive switch to ON position.
Related
Drive current of PC EPC solenoid can be checked by using monitoring function.
information
(Code: 01300)
Method of reproducing failure code: Turn starting switch to ON position.
No. Cause
Defective PC-EPC
solenoid
1
(Internal short circuit or
ground fault)
Defective pump
secondary drive switch
2
(internal short circuit or
ground fault)
Short circuit or ground
3
fault in wiring harness
Ground fault in wiring
harness
4
(Contact with ground
circuit)
Pump controller is
5
defective.
40-354
Front Pump PC-EPC Solenoid Short 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-adapter to male side.
Between V11 (male) (1) and (2)
Resistance
Between V11 (male) (1) and ground
1. Turn starting switch to OFF position.
2. Disconnect connector S25 and connect T-adapter to male side.
Between S25 (male) (5) and each of
(2) and (3)
Resistance
Between ground and each of S25
(male) (2) and (3)
1. Turn starting switch to OFF position.
2. Disconnect connector CP02 and connect T-adapter to female side.
a Check that pump secondary drive switch is at normal position (lower side).
Between CP02 (female) (96) and each of (115),
(117), and (120)
Resistance
Between CP02 (female) (96) and ground
a If no failure is found by check on cause 3, this check is not required.
1. Turn starting switch to OFF position.
2. Disconnect connectors CP02, S25 and V11, and connect T-adapter to any
female side.
Between ground and CP02 (female) (96) or S25
(female) (3)
Resistance
Between ground and S25 (female) (5) or 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.)
(PC88MR-
3 to 14 z
Min. 1 Mz
Min. 1 Mz
Switch
position:
Normal
Min. 1 Mz
3 to 14 z
Min. 1 Mz
Min. 1 Mz
Min. 1 Mz
PC88MR-10