Failure Code [Ddb6Kz] Parking Brake Switch (Bottom Switch) Or Parking Brake Reminder Switch (Intermediate Switch): Trouble - Komatsu WA250-6 Shop Manual

SEN03845-00
Failure code [DDB6KZ] Parking brake switch (bottom switch) or parking
brake reminder switch (intermediate switch): Trouble
Action code Failure code
E03 DDB6KZ
Contents of
• Parking brake indicator signal was closed and opening of parking brake reminder signal was
trouble
detected.
Action of • Turns the centralized warning lamp and alarm buzzer ON.
machine monitor
• Turns parking brake indicator and parking brake remind caution lamp ON.
• While parking brake is in intermediate position, parking brake reminder caution lamp does not light.
Problem that
appears on
• While parking brake is in intermediate position, parking brake reminder buzzer does not sound.
machine
• While parking brake is in intermediate position, centralized warning lamp does not light.
• Input state (ON/OFF) of parking brake indicator signal and reminder signal can be checked with
Related
monitoring function.
information
(Monitoring code: MONITOR PANEL – 40903 – D-IN-26, 28)
(Monitoring code: MONITOR PANEL – 40904 – D-IN-35, 36)
Defective diode
1
(Internal defect)
Disconnection in wiring har-
Possible causes
ness (Disconnection in wiring
and standard
2
or defective contact in con-
value in normal
nector)
state
Ground fault in wiring har-
3 ness (Contact with GND cir-
cuit)
4 Defective machine monitor
16
40-350
Failure code [DDB6KZ] Parking brake switch (bottom switch) or parking brake reminder switch
Trouble
Causes
350 Troubleshooting by failure code (Display of code), Part 5
Parking brake switch (bottom switch) or parking brake reminder
switch (intermediate switch): Trouble (Machine monitor system)
Standard value in normal state/Remarks on troubleshooting
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)
Between D03 (male) (5) – (1)
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),
(14) – L53 (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 L27 (female) (1), (6)
– D02 (female) (7) and ground
If causes 1 – 3 are not detected, machine monitor may be defective.
(Since trouble is in system, troubleshooting cannot be carried out.)
(intermediate switch): Trouble
Continuity is secured
Continuity is secured
Resis-
Max. 1 z
tance
Resis- Min.
tance 1 Mz
WA250, 250PZ-6