Error Code [226] (Abnormality In Pressure Sensor Power Supply) - Komatsu PC130-7 Shop Manual

TROUBLESHOOTING

Error code [226] (Abnormality in pressure sensor power supply)

User code Error code
– 226
Contents of
• An abnormal current flows in the power supply (5 V) circuit of the pressure sensor or potentiometer.
trouble
• Turns the output to the power supply (5 V) circuit OFF.
Action of
• Even if the cause of the failure disappears, the system does not reset itself until the starting switch is
controller
turned OFF.
Problem that • The signals of the pressure sensor and potentiometer are not input normally.
appears on • The error codes of abnormality in the pressure sensor and abnormality in the potentiometer are dis-
machine played simultaneously.
Related
information
Defective pressure sensor
1 or potentiometer (Internal
short circuit)
Possible causes
and standard
value in normal
state
Short circuit with chassis
ground in wiring harness
2
(Contact with ground cir-
cuit)
Defective governor and
3
pump controller
20-342
(1)
Abnormality in pressure sensor power supply
Trouble
(Governor and pump controller system)
Cause Standard value in normal state/Remarks on troubleshooting
aDisconnect connector with starting switch OFF, then turn starting
switch ON and carry out troubleshooting.
Disconnect the devices
at right in order. If the
error code disappears
when a device is dis-
connected, that device
has a defect in it.
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch.
Between C01 (female) (22) – J07 – E06
(female) (1) wiring harness and chassis ground
[Fuel control dial system]
Between C01 (female) (22) – J07 – E10
(female) (A) wiring harness and chassis ground
[Governor potentiometer system]
Between C01 (female) (22) – J07 – A51
(female) (B) wiring harness and chassis ground
[Pump pressure sensor system]
Between C01 (female) (22) – J07 – A70
(female) (B) wiring harness and chassis ground
[Overload pressure sensor system: If installed]
aPrepare with starting switch OFF, then turn starting switch ON and car-
ry out troubleshooting.
Between (22) and (10)
Fuel control dial
Governor
potentiometer
Pump pressure
sensor
Overload pressure
sensor (If installed)
C01
[226]
Connector E06
Connector E10
Connector A51
Connector A70
Min. 1 Mz
Resistance
Resistance Min. 1 Mz
Resistance Min. 1 Mz
Min. 1 Mz
Resistance
Voltage
4.5 – 5.5 V
PC130-7