Failure Code [Dhx1Ma] Overload Sensor Abnormality (Analog) - Komatsu PC210-8 Shop Manual

UEN00242-01

Failure code [DHX1MA] Overload Sensor Abnormality (Analog)

User code Failure code
— DHX1MA
Contents of
• Signal voltage of overload alarm pressure sensor circuit is below 0.3 V or above 4.4 V.
trouble
Action of • Outputs overload alarm constantly.
controller
• If cause of failure disappears, system resets itself.
Problem that
appears on
• If display of overload alarm monitor is set, overload alarm monitor is displayed constantly.
machine
• Overload alarm pressure sensor is installed to only machine on which display of overload alarm
monitor is set.
a If 5V circuit (3) and ground circuit (1) of pressure sensor are connected inversely, pressure sensor
Related infor-
will be broken. Accordingly, take extreme care when checking.
mation
• Overload alarm pressure (Boom cylinder bottom pressure) can be checked with monitoring function.
(Code: 15900 Boom bottom pressure)
• Method of reproducing failure code: Turn starting switch ON or start engine.
Defective 5V sensor power
1
supply 1 system
Defective overload alarm
2 pressure sensor (Internal
defect)
Possible causes
and standard
Disconnection in wiring har-
value in normal
ness (Disconnection in wiring
3
state
or defective contact in con-
nector)
Ground fault in wiring har-
4 ness (Short circuit with GND
circuit)
Hot short (Short circuit with
5
24V circuit) in wiring harness
6 Defective pump controller
28
Overload sensor (analog)
Trouble
(Pump controller system)
Cause
If failure code [DA25KP] is also displayed, carry out troubleshooting
for it first.
a Prepare with starting switch OFF, then turn starting switch ON or
Between (3) – (1)
Between (2) – (1)
If voltage is abnormal, replace overload alarm pressure sensor with
F pump pressure sensor or R pump pressure sensor and check fail-
ure code. (If "E" of failure code goes off at this time, overload alarm
pressure sensor is defective.)
a Prepare with starting switch OFF, then carry out troubleshooting
Wiring harness between C01 (female) (18) –
P46 (female) (1)
Wiring harness between C01 (female) (74) –
P46 (female) (2)
Wiring harness between C01 (female) (9) –
J06 – P46 (female) (3)
a Prepare with starting switch OFF, then carry out troubleshooting
Wiring harness between C01 (female) (9) –
P46 (female) (2)
a Prepare with starting switch OFF, then turn starting switch ON
Wiring harness between C01 (female) (9) –
P46 (female) (2)
If causes 1 – 5 are not detected, pump controller may be defective.
(Since trouble is in system, troubleshooting cannot be carried out.)
Standard value in normal state/Remarks on troubleshooting
start engine and carry out troubleshooting in each case.
P46
Power supply
without turning starting switch ON.
without turning starting switch ON.
and carry out troubleshooting.
40 Troubleshooting
Voltage
4.5 – 5.5 V
Signal 0.3 – 4.4 V
Resis-
tance
Resis-
tance
Resis-
tance
Resis-
tance
Voltage
PC210, 230, 240-8
1
Max. 1 z
Max. 1 z
Max. 1 z
Min. 1 Mz
Max. 1 V