Failure Code [Ddb6Kb] Parking Brake Switch B: Ground Fault - Komatsu WA250-6 Shop Manual

SEN03845-00

Failure code [DDB6KB] Parking brake switch B: Ground fault

Action code Failure code
E01 DDB6KB
Contents of
• While parking brake signal B of machine monitor was not input (open), there was input signal
trouble
(switch B was closed).
Action of
• None in particular.
controller
Problem that
• Since machine can travel forward and reverse while parking brake is applied, parking brake may be
appears on
damaged (Alarm buzzer sounds in this case, however).
machine
• Parking brake switch A : For parking brake remind (Intermediate)
• Parking brake switch B : For parking brake indicator (Bottom)
• Operation of parking brake can be checked with monitoring function.
[Parking brake switch A] (Recognition by machine monitor)
Related
(Monitoring code: MONITOR PANEL – 40903 – D-IN-28 and 40904 – D-IN-35)
information
[Parking brake switch B] (Recognition by machine monitor)
(Monitoring code: MONITOR PANEL – 40903 – D-IN-26 and 40904 – D-IN-36)
[Parking brake switch A/B] (HST controller recognition)
(Monitoring code: HST – 99100 – PARKING A/B)
Defective diode
1
(Internal defect)
Disconnection in wiring har-
ness (Disconnection in wiring
2
or defective contact in con-
nector)
Ground fault in wiring har-
Possible causes
3 ness (Contact with GND cir-
and standard
cuit)
value in normal
state
4 Defective HST controller
5 Defective machine monitor
14
40-350
Parking brake switch B: Ground fault
Trouble
(HST controller system)
Causes
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
(See Testing and adjusting, "Test procedure for diode".)
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness between L27 (female) (1),
(16) – L47 (female) (2)
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
(Test with parking brake applied.)
Between wiring harness HST (female) (16) –
D02 (female) (5) and ground
a Prepare with starting switch OFF, then start engine and carry out
troubleshooting.
(Test with parking brake applied.)
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
(Test with parking brake released.)
350 Troubleshooting by failure code (Display of code), Part 5
Failure code [DDB6KB] Parking brake switch B: Ground fault
Standard value in normal state/Remarks on troubleshooting
Between D02 (male) (7) – (3)
HST
Between (16) – ground
L27
Between (1) (6) – ground
Continuity is secured
Resis-
Max. 1 z
tance
Resis- Min.
tance 1 Mz
Voltage
20 – 30 V
Voltage
Max. 1 V
WA250, 250PZ-6