Failure Code [Dw45Ky] Swing Brake Sol Hot Short Circuit - Komatsu PC88MR-10 Shop Manual

Failure code [DW45KY] Swing Brake Sol Hot Short Circuit

A)
Action level Failure code
L03 DW45KY
When controller does not drive swing brake solenoid, output terminal voltage of controller
Detail of
is higher than specified value, and hot short circuit is detected.
failure
None in particular.
Action of
If cause of failure disappears, machine becomes normal by itself.
controller
Problem on
Swing parking brake solenoid does not work.
machine
When solenoid and wiring harness are normal, swing operation is possible if swing
parking brake cancel switch is set to RELEASE position. (Note that swing holding brake is
applied when starting switch is in OFF position.)
Keep the swing lock switch in the OFF position and the swing parking brake cancel switch
in the RELEASE position during troubleshooting. When starting switch is turned to ON
position in this condition, normally current can flow in swing holding brake solenoid circuit
and the swing holding brake will be released.
Related
Controller's command (ON/OFF) to swing holding brake solenoid can be checked with
information
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
circuit.)
(Code: 02300)
Method of reproducing failure code: Turn starting switch to ON position.
Power for swing holding brake solenoid circuit is supplied from pin (101) of pump
controller connector C02 or fuse No.1 in fuse box F01.
No. Cause
Hot short circuit in
1
wiring harness
Pump controller is
2
defective.
PC88MR-10
Swing Brake Solenoid Hot Short Circuit
Failure
(Pump controller system)
Procedure, measuring location, criteria, and remarks
1. Turn starting switch to OFF position.
2. Remove diode D01and connect T-adapter to female side.
3. Turn starting switch to ON position.
Voltage Between D01 (female) (7) and ground
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-DW45KY-400-A-Z0-
Max. 4.5 V
40-343