Failure Code [Dwj0Kb] Merge-Divider Sol Short Circuit - Komatsu PC88MR-10 Shop Manual

Failure code [DWJ0KB] Merge-divider Sol Short Circuit

Action level Failure code
L01 DWJ0KB
Abnormal current flows when pump controller drives pump merge-divider solenoid, so
pump controller determines that short circuit exists in pump merge-divider solenoid circuit.
Detail of
Controller output voltage to solenoid is above standard value when pump controller does
failure
not drive pump merge-divider solenoid, so pump controller determines that open circuit
exists in pump merge-divider solenoid circuit.
Stops driving pump merge-divider 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
Machine does not turn during travel.
machine
Controller's command (ON/OFF) to pump merge-divider solenoid can be checked with
monitoring function. (As long as controller's command to solenoid is "ON", sensor status
displayed on monitoring screen is "ON" even if solenoid is not energized due to short
Related
circuit.)
information
(Code: 02300)
Pump merge-divider circuit is made when solenoid is de-energized.
Method of reproducing failure code: Turn starting switch to ON position.
No. Cause
Defective pump merge-
divider solenoid
1
(Internal short circuit or
ground fault)
Short circuit or ground
2
fault in wiring harness
Ground fault in wiring
harness
3
(Contact with ground
circuit)
Pump controller is
4
defective.
PC88MR-10
Pump Merge-divider Solenoid Short Circuit
Failure
(Pump controller system)
Procedure, measuring location, criteria, and remarks
1. Turn starting switch to OFF position.
2. Disconnect connector V04, and connect T-adapter to male side.
Between V04 (male) (1) and (2)
Resistance
Between V04 (male) (1) and ground
1. Turn starting switch to OFF position.
2. Disconnect connector CP02 and connect T-adapter to female side.
Between CP02 (female) (85) and each of (115),
(117), and (120)
Resistance
Between CP02 (female) (85) and ground
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 CP02 and V04, and connect T-adapter to either
female side.
Between ground and CP02 (female) (85) or V04
Resistance
(female) (1)
If no failure is found by above checks, pump controller is defective.
(Since this is an internal defect, troubleshooting cannot be performed.)
40 Troubleshooting
Troubleshooting by failure code (Display of code)
(PC88MR-DWJ0KB-400-A-Z0-A)
20 to 60 z
Min. 1 Mz
20 to 60 z
Min. 1 Mz
Min. 1 Mz
40-349