Failure Code [Ddb6L0] Parking Brake Switch A: Ground Fault - Komatsu WA250-6 Shop Manual

SEN03845-00

Failure code [DDB6L0] Parking brake switch A: Ground fault

Action code Failure code
E01 DDB6L0
Contents of
• While parking brake switch A operation signal of machine monitor was not input (open), parking
trouble
brake switch A operation signal of HST controller was input (closed).
Action of
• When engine is stopped while parking brake is not applied securely, move-down prevention is not
controller
controlled.
Problem that
• If starting switch is turned OFF without applying parking brake securely on slope, machine moves
appears on
down suddenly.
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)
Possible causes
Ground fault in wiring har-
and standard
3 ness (Contact with GND cir-
value in normal
cuit)
state
4 Defective HST controller
5 Defective machine monitor
18
40-350
Parking brake switch A: 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.
(Test with parking brake released.)
Wiring harness between L27 (female) (2) –
L43 (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) (6) –
D02 (female) (6) and ground
a Prepare with starting switch OFF, then turn starting switch ON
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 [DDB6L0] Parking brake switch A: Ground fault
Standard value in normal state/Remarks on troubleshooting
Between D02 (male) (8) – (4)
HST
Between (6) – 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