Failure Code [Dhh1Kx] Hst Oil Pressure Sensor: Disconnection/Ground Fault - Komatsu WA250-6 Shop Manual

SEN03846-00
Failure code [DHH1KX] HST oil pressure sensor: Disconnection/Ground
fault
Action code Failure code
E03 DHH1KX
Contents of
• HST oil pressure sensor signal is not input because of disconnection or ground fault in HST oil pres-
trouble
sure sensor system (Input voltage is below 0.3 V)
• If trouble occurs during travel, control value (output) before trouble occurrence is held.
Action of
• Once machine stops, gear is assumed to be in 1st for control.
controller
• Turns the centralized warning lamp and alarm buzzer ON.
Problem that
• Once machine stops, gear is set in 1st. (Travel speed can be controlled with travel speed control
appears on
dial, however.)
machine
• If [DAJ5KX] is displayed, carry out troubleshooting for it first.
Related
• Input state from HST oil pressure sensor can be checked with monitoring function.
information
(Monitoring code: HST 32600 HST PRESS (MPa))
(Monitoring code: HST 32601 HST PRESS (V))
Defective HST oil pressure
1
sensor (Internal defect)
Disconnection in wiring har-
ness (Disconnection in wiring
2
or defective contact in con-
Possible causes
nector)
and standard
value in normal
state
Ground fault in wiring har-
3 ness (Contact with GND cir-
cuit)
4 Defective HST controller
12
40-360

Failure code [DHH1KX] HST oil pressure sensor: Disconnection/Ground fault

HST oil pressure sensor: Disconnection/Ground fault
Trouble
(HST controller system)
Causes
a Prepare with starting switch OFF, then turn starting twitch ON and
carry out troubleshooting.
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness between HST (female) (33) –
T11 (female) (C)
Wiring harness between HST (female) (32) –
T11 (female) (A)
Wiring harness between HST (female) (22) –
T11 (female) (B)
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Between wiring harness HST (female) (33) –
T11 (female) (C) and ground
Between wiring harness HST (female) (22) –
T11 (female) (B) and ground
a Prepare with starting switch OFF, then start engine and carry out
troubleshooting.
360 Troubleshooting by failure code (Display of code), Part 6
Standard value in normal state/Remarks on troubleshooting
T11
Between (C) – (A)
Between (B) – (A)
HST
Between (33) – (32)
Between (22) – (32)
Voltage
0.5 – 4.5 V
4 – 6 V
Resis-
Max. 1 z
tance
Resis-
Max. 1 z
tance
Resis-
Max. 1 z
tance
Resis- Min.
tance 1 Mz
Resis- Min.
tance 1 Mz
Voltage
0.5 – 4.5 V
4 – 6 V
WA250, 250PZ-6