Failure Code [Dhsbma] Swing Lh Ppc Press Sensor Abnormality - Komatsu PC210-8 Shop Manual

UEN00242-01

Failure code [DHSBMA] Swing LH PPC Press Sensor Abnormality

User code Failure code
— DHSBMA
Contents of
• Signal voltage of swing left PPC pressure sensor circuit is below 0.3 V or above 4.5 V.
trouble
Action of • Fixes swing left PPC pressure at 0 MPa {0 kg/cm
controller
• If cause of failure disappears, system resets itself.
Problem that
• Automatic decelerator and swing holding brake cannot be reset.
appears on
• Swing left 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-
• Swing left PPC pressure can be checked with monitoring function.
mation
(Code: 09002 Swing left PPC pressure)
• Method of reproducing failure code: Turn starting switch ON or start engine.
Defective 5V sensor power
1
supply 1 system
Defective swing left 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
24
Swing left 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 swing left PPC pressure sensor with
another PPC pressure sensor and check failure code. (If "E" of fail-
ure code goes off at this time, swing left PPC pressure sensor is
defective.)
a Prepare with starting switch OFF, then carry out troubleshooting
Wiring harness between C01 (female) (18) –
P03 (female) (1)
Wiring harness between C01 (female) (16) –
P03 (female) (2)
Wiring harness between C01 (female) (9) –
J06 – P03 (female) (3)
a Prepare with starting switch OFF, then carry out troubleshooting
Wiring harness between C01 (female) (16) –
P03 (female) (2)
a Prepare with starting switch OFF, then turn starting switch ON
Wiring harness between C01 (female) (16) –
P03 (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.
P03
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