Failure Code [Dhs8Ma] Boom Raise Ppc Press Sensor Abnormality - Komatsu PC210-8 Shop Manual

UEN00242-01

Failure code [DHS8MA] Boom Raise PPC Press Sensor Abnormality

User code Failure code
— DHS8MA
Contents of
• Signal voltage of boom raise PPC pressure sensor circuit is below 0.3 V or above 4.5 V.
trouble
Action of • Fixes boom raise PPC pressure at 0 MPa {0 kg/cm
controller
• If cause of failure disappears, system resets itself.
Problem that
• Automatic decelerator cannot be reset.
appears on
• Boom raise performance lowers.
machine
a If 5V circuit (3) and ground circuit (1) of pressure sensor are connected inversely, pressure sensor
will be broken. Accordingly, take extreme care when checking.
Related infor-
• Boom raise PPC pressure can be checked with monitoring function.
mation
(Code: 07400 Boom raise PPC pressure)
• Method of reproducing failure code: Turn starting switch ON or start engine.
Defective 5V sensor power
1
supply 1 system
Defective boom raise PPC
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
20
Boom raise PPC pressure sensor abnormality
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 boom raise PPC pressure sensor
with another PPC pressure sensor and check failure code. (If "E" of
failure code goes off at this time, boom raise PPC pressure sensor
is defective.)
a Prepare with starting switch OFF, then carry out troubleshooting
Wiring harness between C01 (female) (18) –
P06 (female) (1)
Wiring harness between C01 (female) (53) –
P06 (female) (2)
Wiring harness between C01 (female) (9) –
J06 – P06 (female) (3)
a Prepare with starting switch OFF, then carry out troubleshooting
Wiring harness between C01 (female) (53) –
P06 (female) (2)
a Prepare with starting switch OFF, then turn starting switch ON
Wiring harness between C01 (female) (53) –
P06 (female) (2)
If causes 1 – 5 are not detected, pump controller may be defective.
(Since trouble is in system, troubleshooting cannot be carried out.)
2
} and continues control.
Standard value in normal state/Remarks on troubleshooting
start engine and carry out troubleshooting in each case.
P06
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 – 4.5 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