Failure Code [Dhpbma] R Pump Press Sensor Abnormality - Komatsu PC210-8 Shop Manual

UEN00242-01

Failure code [DHPBMA] R Pump Press Sensor Abnormality

User code Failure code
— DHPBMA
Contents of
• Signal voltage of R pump pressure sensor circuit is below 0.3 V or above 4.5 V.
trouble
Action of • Fixes R pump pressure at 0 MPa {0 kg/cm
controller
• If cause of failure disappears, system resets itself.
Problem that
• Automatic gear shifting function does not work.
appears on
• Straight travel performance or steering 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-
mation • R pump pressure can be checked with monitoring function. (Code: 01101 R pump pressure)
• Method of reproducing failure code: Turn starting switch ON or start engine.
Defective 5V sensor power
1
supply 1 system
Defective R pump pressure
2
sensor (Internal defect)
Possible causes
Disconnection in wiring har-
and standard
ness (Disconnection in wiring
value in normal
3
or defective contact in con-
state
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
14
R pump 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 R pump pressure sensor with F
pump pressure sensor and check failure code. (If "E" of failure code
goes off at this time, R pump pressure sensor is defective.)
a Prepare with starting switch OFF, then carry out troubleshooting
Wiring harness between C01 (female) (18) –
P26 (female) (1)
Wiring harness between C01 (female) (68) –
P26 (female) (2)
Wiring harness between C01 (female) (9) –
J06 – P26 (female) (3)
a Prepare with starting switch OFF, then carry out troubleshooting
Wiring harness between C01 (female) (68) –
P26 (female) (2)
a Prepare with starting switch OFF, then turn starting switch ON
Wiring harness between C01 (female) (68) –
P26 (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.
P26
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