Failure Code [Dhh1Ky] Hst Oil Pressure Sensor: Hot Short - Komatsu WA250-6 Shop Manual

SEN03846-00

Failure code [DHH1KY] HST oil pressure sensor: Hot short

Action code Failure code
E03 DHH1KY
Contents of
• Abnormal HST oil pressure sensor signal was input because of hot short in HST oil pressure sensor
trouble
system (Input voltage was above 4.7 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)
Possible causes
and standard
Hot short (Contact with 24V
value in normal
2
circuit) in wiring harness
state
3 Defective HST controller
14
40-360
HST oil pressure sensor: Hot short
Trouble
(HST controller system)
Causes
a Prepare with starting switch OFF, then start engine and carry out
troubleshooting.
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
Between wiring harness HST (female) (33) –
T11 (female) (C) 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
Failure code [DHH1KY] HST oil pressure sensor: Hot short
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
Voltage Max. 1 V
Voltage
0.5 – 4.5 V
4 – 6 V
WA250, 250PZ-6