Failure Code [Daj2L4] Hst Controller Load Power Supply Holding Line: Disconnection/Ground Fault - Komatsu WA250-6 Shop Manual

SEN03844-00

Failure code [DAJ2L4] HST controller load power supply holding line: Disconnection/Ground fault

Failure code [DAJ2L4] HST controller load power supply holding line:
Disconnection/Ground fault
Action code Failure code
E01 DAJ2L4
• Disconnection or ground fault was detected in load power supply holding line during HST controller
Contents of
final check.
trouble
(During final check, when output command was OFF, voltage below 5.7 V was detected.
Action of
• Relay cannot be driven while there is disconnection.
machine monitor
• While there is disconnection, when starting switch is turned OFF, parking brake check cannot be
Problem that
controlled and machine moves down.
appears on
• If starting switch is turned OFF while disconnection is made or fan is rotating in reverse, peak pres-
machine
sure may occur.
Related
information
Defective HST safety relay
1
(Internal defect)
Possible causes
and standard
value in normal
Disconnection in wiring har-
state
ness (Disconnection in wiring
2
or defective contact in con-
nector)
Ground fault in wiring har-
3 ness (Contact with GND cir-
cuit)
4 Defective HST controller
32
40-340
HST controller load power supply holding line: Disconnection/
Trouble Ground fault
(HST controller system)
Causes
a Prepare with starting switch OFF, then turn starting switch ON
and OFF, wait for 30 seconds, and turn it ON again and carry out
troubleshooting.
Replace VIS power
supply holding relay
(L102) with another
relay.
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Between L102 (male) (1) – (2)
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness between HST (female) (7) –
L102 (female) (2)
Wiring harness between L102 (female) (1) –
fuse FS1 (No.3)
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Between wiring harness HST (female) (7) –
L102 (female) (2) and ground
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
340 Troubleshooting by failure code (Display of code), Part 4
Standard value in normal state/Remarks on troubleshooting
Condition becomes
normal.
Condition does not
become normal.
HST
Between (7) – ground
Relay (L102) is
defective.
Relay (L102) is
normal.
Resis- 200 – 400
tance z
Resis-
Min. 1 Mz
tance
Resis-
Min. 1 Mz
tance
Resis-
Min. 1 Mz
tance
Voltage
Max. 1 V
WA250, 250PZ-6