Failure Code [Dw45Kb] Swing Brake Sol Short Circuit - Komatsu PC200-8M0 Shop Manual

SEN06136-00

Failure code [DW45KB] Swing Brake Sol Short Circuit

Action
Failure code
level
L03 DW45KB
q
Abnormal current flows when pump controller drives swing holding brake solenoid, so pump con-
Detail of failure
troller determines that short circuit exists in swing holding brake solenoid circuit.
q
Stops driving swing holding brake solenoid.
Action of con-
q
Even if cause of failure disappears, machine does not become normal until starting switch is turned
troller
to OFF position.
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
Keep swing lock switch in OFF position and swing brake cancel switch in RELEASE position during
troubleshooting. When starting switch is turned to ON position in this condition, normally current
Related infor-
can flow in swing holding brake solenoid circuit and brake 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 holding brake solenoid circuit is powered from pin (101) of pump controller connector C02 or
pin (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
Ground fault in wiring harness
4
(contact with ground circuit)
5 Short circuit in wiring harness
6 Defective pump controller
42
40-304
Failure code [DW45KB] Swing Brake Sol Short Circuit
Swing Brake Solenoid Short Circuit
Failure
(Pump controller system)
Procedure, measuring location, criteria and remarks
Even if fuse is blown, perform troubleshooting according to following steps to
identify cause.
1. Turn starting switch to OFF position.
2. Disconnect connector V03, and connect T-adapters to male side.
Between V03 (male) (1) and (2)
Between V03 (male) (1) and ground
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 fuse No.1 (right top, 10 A) in fuse box F01 and diode D01.
3. Disconnect connectors C02, D01 and V03.
4. Connect T-adapters to female sides of connectors C02 and D01.
Between C02 (female) (101) and ground
Between D01 (female) (3) and ground
1. Turn starting switch to OFF position.
2. Remove fuse No.1 (right top, 10 A) in fuse box F01 and diode D01.
3. Disconnect connector C02.
4. Connect T-adapters to female sides of connectors D01 and C02.
a Check the swing lock switch OFF position.
Between D01 (female) (3) and C02 (female) (115)
or (117) or (120)
a Swing brake solenoid coil resistance.
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
Resistance Min. 1 Mz
No continuity
Continuity
No continuity
Continuity
Resistance Min. 1 Mz
Resistance Min. 1 Mz
Resistance 20 to 60 z
PC200, 200LC, 220, 220LC-8M0