Hydraulic Oil Temperature Gauge Does Not Display Correctly - Komatsu Galeo PC800-8 Shop Manual

SEN00793-02
E-13 Hydraulic oil temperature gauge does not display correctly
Failure • Hydraulic oil temperature gauge does not dis-
phenomenon play correctly
Relative • Input from the hydraulic oil temperature sensor can be confirmed in the monitor function.
information (Code No. 04401: Hydraulic oil temperature, 04402: Hydraulic oil temperature sensor voltage)
Hydraulic oil temperature
sensor fault
1 (Internal disconnection,
short-circuiting or ground-
ing fault)
Disconnection of wiring
harness
2
(Disconnection or defec-
tive contact with connector)
Possible causes
and standard
Grounding fault of wiring
value in normal
harness
state
3
(Contact with grounding
(GND) circuit)
Short-circuiting of wiring
4 harness
(Contact with 24 V circuit)
5 Defective machine monitor
Circuit diagram related to hydraulic oil temperature sensor
30
Cause Standard value in normalcy and references for troubleshooting
aTurn the engine starting switch OFF for the preparations, and hold it in
the OFF position during the troubleshooting.
Between (1) – (2)
(1) – chassis ground
aTurn the engine starting switch OFF for the preparations, and hold it in
the OFF position during the troubleshooting.
Wiring harness between CM02 (female) (12) –
P22 (female) (1)
Wiring harness between CM02 (female) (13) –
P22 (female) (2)
aTurn the engine starting switch OFF for the preparations, and hold it in
the OFF position during the troubleshooting.
Wiring harness between CM02 (female) (12) –
P22 (female) (1) and chassis ground
aTurn the engine starting switch OFF for the preparations, and hold it in
the ON position during the troubleshooting.
Wiring harness between CM02 (female) (12) –
P22 (female) (1) and chassis ground
aTurn the engine starting switch OFF for the preparations, and hold it in
the OFF position during the troubleshooting.
CM02 (female)
Between (12) – (13)
(12) – chassis ground
(1) Hydraulic oil temperature rises normally, but the dis-
play does not exceed the white range (C).
(2) Hydraulic oil temperature remains stable, but the
display rises up the red range (H).
Hydraulic oil tempera-
P22 (male)
10 – 100°C
Between
Hydraulic oil tempera-
10 – 100°C
Between
40 Troubleshooting
Resistance
ture
90 – 3.5 kz
Min. 1 Mz
Resis-
tance
Resis-
tance
Resis-
tance
Voltage
Resistance
ture
90 – 3.5 kz
Min. 1 Mz
PC800, 850-8
Max. 1 z
Max. 1 z
Min. 1 Mz
Max. 1 V