SEN03845-00
40-350 18 WA250, 250PZ-6
350 Troubleshooting by failure code (Display of code), Part 5
Failure code [DDB6L0] Parking brake switch A: Ground fault
Failure code [DDB6L0] Parking brake switch A: Ground fault
Action code Failure code
Trouble
Parking brake switch A: Ground fault
(HST controller system)
E01 DDB6L0
Contents of
trouble
• While parking brake switch A operation signal of machine monitor was not input (open), parking
brake switch A operation signal of HST controller was input (closed).
Action of
controller
• When engine is stopped while parking brake is not applied securely, move-down prevention is not
controlled.
Problem that
appears on
machine
• If starting switch is turned OFF without applying parking brake securely on slope, machine moves
down suddenly.
Related
information
• 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)
(Monitoring code: MONITOR PANEL – 40903 – D-IN-28 and 40904 – D-IN-35)
[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)
Possible causes
and standard
value in normal
state
Causes Standard value in normal state/Remarks on troubleshooting
1
Defective diode
(Internal defect)
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
(See Testing and adjusting, “Test procedure for diode”.)
Between D02 (male) (8) – (4) Continuity is secured
2
Disconnection in wiring har-
ness (Disconnection in wiring
or defective contact in con-
nector)
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)
Resis-
tance
Max. 1 z
3
Ground fault in wiring har-
ness (Contact with GND cir-
cuit)
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
Resis-
tance
Min.
1 Mz
4 Defective HST controller
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
(Test with parking brake applied.)
HST Voltage
Between (6) – ground 20 – 30 V
5 Defective machine monitor
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
(Test with parking brake released.)
L27 Voltage
Between (1) (6) – ground Max. 1 V
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