Failure Code [Dw43Kb] Travel Speed Solenoid Short Circuit - Komatsu PC88MR-10 Shop Manual

Failure code [DW43KB] Travel Speed Solenoid Short Circuit

A-Z0-A)
Action level Failure code
L01 DW43KB
Abnormal current flows when pump controller drives travel speed selector solenoid, so
Detail of
pump controller determines that short circuit exists in travel speed selector solenoid
failure
circuit.
Stops driving travel speed selector solenoid.
Action of
Even if cause of failure disappears, machine does not become normal until starting switch
controller
is turned to OFF position.
"Hi" travel speed is slow. (Although "Hi" is displayed on machine monitor, actual travel
Problem on
speed is still "Lo".)
machine
Controller's command (ON/OFF) to travel speed selector 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)
Method of reproducing failure code: Turn starting switch to ON position.
No. Cause
Defective travel speed
selector 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
Travel Speed Solenoid Short Circuit
Failure
(Pump controller system)
Procedure, measuring location, criteria, and remarks
1. Turn starting switch to OFF position.
2. Disconnect connector V02, and connect T-adapter to male side.
Between V02 (male) (1) and (2)
Resistance
Between V02 (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) (93) and each of (115),
(117), and (120)
Resistance
Between CP02 (female) (93) and ground
a If no abnormality is found in check on cause 2, this check is not required.
1. Turn starting switch to OFF position.
2. Disconnect connectors C02 and V02, and connect T-adapter to either
female side.
Between ground and CP02 (female) (93) or V02
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-DW43KB-400-
20 to 60 z
Min. 1 Mz
20 to 60 z
Min. 1 Mz
Min. 1 Mz
40-335