Failure Code [Dw45Ka] Swing Brake Sol. Valve Open Circuit - Komatsu PC200-8M0 Shop Manual

SEN06136-00

Failure code [DW45KA] Swing Brake Sol. Valve Open Circuit

Action
Failure code
level
L03 DW45KA
q
Controller output voltage to solenoid is above standard value when pump controller does not drive
Detail of failure swing holding brake solenoid, so pump controller determines that open circuit exists in swing hold-
ing brake solenoid circuit.
q None in particular. (Since no current flows, solenoid is not energized, so swing holding brake is kept
Action of con-
applied.)
troller
q
If cause of failure disappears, machine becomes normal by itself.
Problem on
q
Upper structure does not swing (swing holding brake is not released).
machine
q
If solenoid and wiring harness are normal, swing operation is possible by setting swing brake can-
cel switch to RELEASE position. (However, swing holding brake is not released while upper struc-
ture is stopped. swing holding brake continues to be applied.)
q
Set swing brake cancel switch to RELEASE position during troubleshooting. When starting switch
is turned to ON position in this condition, normally current can flow in swing holding brake solenoid
Related infor-
circuit and break can be released.
mation
q
Controller command (ON/OFF) to swing holding brake solenoid can be checked with monitoring
function. (Code: 02300 Solenoid 1)
q
Method of reproducing failure code: Turn starting switch to ON position.
q
Swing brake solenoid circuit is powered from pin (101) of pump controller connector C02 or No.1
of fuse box F01.
Cause
Blown fuse No. 1 (right top fuse) in
1
fuse box F01
Defective swing holding brake
2
solenoid
3 Defective diode array D01 or D03
Open circuit in wiring harness
4 (wire breakage or defective con-
tact of connector)
5 Defective pump controller
40
40-304
Failure code [DW45KA] Swing Brake Sol. Valve Open Circuit
Swing Brake Solenoid Valve 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.
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 Check the continuity in diode range.
Between D01 (male) (3) (+) and (7) (-)
Between D01 (male) (7) (+) and (3) (-)
Between D03 (male) (3) (+) and (7) (-)
Between D03 (male) (7) (+) and (3) (-)
1. Turn starting switch to OFF position.
2. Remove diode D01.
3. Disconnect connector C02 and connect T-adapters to each female side.
a Swing lock switch OFF position.
Between C02 (female) (101) and D01 (female) (7)
Between D01 (female) (3) and C02 (female) (115)
a If no failure is found by above checks, this check is not required.
1. Turn starting switch to OFF position.
2. Disconnect connectors D01, C02, and V03, and connect T-adapters to
each female side.
Between D01 (female) (3) and V03 (female) (1)
Between V03 (female) (2) and C02 (female) (115)
or (117) or (120)
If no failure is found by above checks, pump controller is defective. (Since this
is an internal defect, troubleshooting cannot be performed.)
304 Troubleshooting by failure code, Part 4
Resistance 20 to 60 z
No continuity
Continuity
No continuity
Continuity
Resistance
Resistance 20 to 60 z
Resistance
Resistance
PC200, 200LC, 220, 220LC-8M0
Max. 1 z
Max. 1 z
Max. 1 z