Error Code [224] (Abnormality In Pump Pressure Sensor) - Komatsu PC130-7 Shop Manual

TROUBLESHOOTING

Error code [224] (Abnormality in pump pressure sensor)

User code Error code
– 224
Contents of
• The signal voltage from the pump pressure sensor is below 0.3 V or above 4.72 V.
trouble
Action of • Sets the pump pressure to 0 MPa {0 kg/cm
controller • If the cause of the failure disappears, the system resets itself.
Problem that
• The travel speed does not change automatically (The travel load pressure cannot be sensed).
appears on
• Cut-off function dose not work (The work equipment pressure can not be detected.)
machine
• If the 5-V circuit (B) and ground circuit (A) of the pressure sensor are connected inversely, the pressure
Related sensor will be broken. Accordingly, take extreme care when checking.
information • The input state (ON/OFF) from the pump pressure sensor can be checked with the monitoring function.
(Code: 011, 012, by 1 kg/cm
Defective sensor power
1
supply
Defective pump pressure
2 sensor (Internal defect)
Disconnection in wiring
harness (Disconnection in
3
Possible causes
wiring harness or defective
and standard
contact in connector)
value in normal
state
Short circuit with chassis
ground in wiring harness
4
(Contact with ground cir-
cuit)
Short circuit with power
5 source in wiring harness
(Contact with 24-V circuit)
Defective governor and
6
pump controller
20-340
(1)
Abnormality in pump pressure sensor
Trouble
(Governor and pump controller system)
2
)
Cause Standard value in normal state/Remarks on troubleshooting
If error code [226] is displayed, carry out troubleshooting for it first.
aPrepare with starting switch OFF, then hold starting switch ON or start
engine and carry out troubleshooting.
Between (B) and (A)
Between (C) and (A)
The pressure sensor voltage is measured with the wiring harness con-
nected. Accordingly, if the voltage is abnormal, check the wiring har-
ness and controller, too, for another cause of the trouble, and then
judge.
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch.
Wiring harness between C01 (female) (22) and
J07 and A51 (female) (B)
Wiring harness between C01 (female) (10) and
A51 (female) (A)
Wiring harness between C01 (female) (8) and
A51 (female) (C)
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch.
Between C01 (female) (8) – A51 (female) (C)
wiring harness and chassis ground
aPrepare with starting switch OFF, then turn starting switch ON and car-
ry out troubleshooting.
Between C01 (female) (22) – J07 – A51
(female) (B) wiring harness and chassis ground
Between C01 (female) (8) – A51 (female) (C)
wiring harness and chassis ground
aPrepare with starting switch OFF, then turn starting switch ON and car-
ry out troubleshooting.
Between (22) and (10)
Between (8) and (10)
2
} for control.
A51
Power supply
Signal
C01
Power supply
Signal
[224]
Voltage
4.5 – 5.5 V
0.5 – 4.5 V
Max. 1 z
Resistance
Max. 1 z
Resistance
Max. 1 z
Resistance
Min. 1 Mz
Resistance
Voltage Max. 1 V
Voltage Max. 1 V
Voltage
4.5 – 5.5 V
0.5 – 4.5 V
PC130-7