Failure Code [Dw45Ka] Swing Parking Brake Solenoid Open Circuit - Komatsu PC88MR-10 Shop Manual

40 Troubleshooting
Troubleshooting by failure code (Display of code)
Failure code [DW45KA] Swing Parking Brake Solenoid Open
Circuit
(PC88MR-DW45KA-400-A-Z0-A)
Action level Failure code
L03 DW45KA
Controller output voltage to solenoid is above standard value when pump controller does
Detail of
not drive swing holding brake solenoid, so pump controller determines that open circuit
failure
exists in swing holding brake solenoid circuit.
None in particular (Since no current flows, solenoid is not energized.) Swing holding brake
Action of
will be applied.)
controller
If cause of failure disappears, machine becomes normal by itself.
Problem on
Upper structure does not swing (swing holding brake is not released).
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 swing parking brake cancel switch in 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 open
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
Blown No. 1 fuse in fuse
1
box F01
Defective swing parking
2
brake solenoid
Defective diode array
3
D01 or D03
Open circuit, short
circuit, ground fault, hot
short circuit of wiring
4
harness, or defective
pump controller
40-338
Swing Parking Brake Solenoid Open Circuit
Failure
(Pump controller system)
Procedure, measuring location, criteria, and remarks
If fuse is blown, see failure code [DW45KB].
1. Turn starting switch to OFF position.
2. Disconnect connector V03, and connect T-adapters to male side.
Resistance Between V03 (male) (1) and (2)
1. Turn starting switch to OFF position.
2. Remove diode arrays D01 and D03, and connect T-adapters to each male
side.
a Measure it with diode range of multimeter.
Between D01 (male) (3) (+) and (7) (-)
Between D01 (male) (7) (+) and (3) (-)
Continuity
Between D03 (male) (5) (+) and (1) (-)
Between D03 (male) (1) (+) and (5) (-)
1. Turn starting switch to OFF position.
2. Swing lock switch OFF position
3. Disconnect connector V03 and connect T-adapter to female side.
4. Turn starting switch to ON position.
a Shake the wiring harness by hand while measuring the voltage. If the
voltage drops to approximately 0 V during shaking, circuit is open around
this point.
Voltage Between V03 (female) (1) and (2)
20 to 60 z
No
continuity
Continuity
No
continuity
Continuity
1 to 4.5 V
PC88MR-10