Komatsu PC210-8 Shop Manual

UEN00242-01 40 Troubleshooting
18 PC210, 230, 240-8
Failure code [DHS4MA] Bucket Curl PPC Press Sensor Abnormality 1
User code Failure code
Trouble
Bucket curl PPC pressure sensor abnormality
(Pump controller system)
— DHS4MA
Contents of
trouble
• Signal voltage of bucket curl PPC pressure sensor circuit is below 0.3 V or above 4.5 V.
Action of
controller
• Fixes bucket curl PPC pressure at 0 MPa {0 kg/cm
2
} and continues control.
• If cause of failure disappears, system resets itself.
Problem that
appears on
machine
• Automatic decelerator cannot be reset.
• Bucket curl performance lowers.
Related infor-
mation
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.
• Bucket curl PPC pressure can be checked with monitoring function.
(Code: 07300 Bucket curl PPC pressure)
• Method of reproducing failure code: Turn starting switch ON or start engine.
Possible causes
and standard
value in normal
state
Cause Standard value in normal state/Remarks on troubleshooting
1
Defective 5V sensor power
supply 1 system
If failure code [DA25KP] is also displayed, carry out troubleshooting
for it first.
2
Defective bucket curl PPC
pressure sensor (Internal
defect)
a Prepare with starting switch OFF, then turn starting switch ON or
start engine and carry out troubleshooting in each case.
P01 Voltage
Between (3) – (1) Power supply 4.5 – 5.5 V
Between (2) – (1) Signal 0.3 – 4.5 V
If voltage is abnormal, replace bucket curl PPC pressure sensor
with another PPC pressure sensor and check failure code. (If "E" of
failure code goes off at this time, bucket curl PPC pressure sensor
is defective.)
3
Disconnection in wiring har-
ness (Disconnection in wiring
or defective contact in con-
nector)
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness between C01 (female) (18) –
P01 (female) (1)
Resis-
tance
Max. 1 z
Wiring harness between C01 (female) (73) –
P01 (female) (2)
Resis-
tance
Max. 1 z
Wiring harness between C01 (female) (9) –
J06 – P01 (female) (3)
Resis-
tance
Max. 1 z
4
Ground fault in wiring har-
ness (Short circuit with GND
circuit)
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness between C01 (female) (73) –
P01 (female) (2)
Resis-
tance
Min. 1 Mz
5
Hot short (Short circuit with
24V circuit) in wiring harness
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
Wiring harness between C01 (female) (73) –
P01 (female) (2)
Voltage Max. 1 V
6 Defective pump controller
If causes 1 – 5 are not detected, pump controller may be defective.
(Since trouble is in system, troubleshooting cannot be carried out.)

Komatsu PC210-8 Specifications

General

Brand	Komatsu
Model	PC210-8
Category	Excavators
Language	English