Hydraulic Oil Temperature Gauge Does Not Indicate Normally; Circuit Diagram Related To Hydraulic Oil Temperature Sensor - Komatsu PC210-8 Shop Manual

40 Troubleshooting
E-10 Hydraulic oil temperature gauge does not indicate normally
(1) While hydraulic oil temperature is rising normally, temperature gauge does not rise from white range
Trouble (C).
(2) While hydraulic oil temperature is stabilized normally, temperature gauge rises to red range (H).
• Signals of hydraulic oil temperature sensor are input to pump controller and then transmitted to
Related infor- machine monitor through communication system.
mation
• Hydraulic oil temperature can be checked with monitoring function.
(Code: 04401 Hydraulic oil temperature)
Defective hydraulic oil tem-
1 perature sensor (Internal dis-
connection or short circuit)
Disconnection in wiring har-
ness (Disconnection in wiring
2
or defective contact in con-
nector)
Possible causes
and standard
Ground fault in wiring har-
value in normal
3 ness (Short circuit with GND
state
circuit)
Hot short (Short circuit with
4
24V circuit) in wiring harness
5 Defective pump controller
6 Defective machine monitor

Circuit diagram related to hydraulic oil temperature sensor

PC210, 230, 240-8
Cause
a Prepare with starting switch OFF, then carry out troubleshooting
Between (2) – chassis ground
a Prepare with starting switch OFF, then carry out troubleshooting
Wiring harness between C01 (female) (29) –
P22 (female) (2)
Wiring harness between C01 (female) (46) –
P22 (female) (1)
a Prepare with starting switch OFF, then carry out troubleshooting
Wiring harness between C01 (female) (29) –
P22 (female) (2)
a Prepare with starting switch OFF, then turn starting switch ON
Wiring harness between C01 (female) (29) –
P22 (female) (2)
a Prepare with starting switch OFF, then carry out troubleshooting
Between (29) – chassis ground
If causes 1 – 5 are not detected, machine monitor may be defective.
(Since trouble is in system, troubleshooting cannot be carried out.)
Standard value in normal state/Remarks on troubleshooting
without turning starting switch ON.
P22 (male)
Between (1) – (2)
without turning starting switch ON.
without turning starting switch ON.
and carry out troubleshooting.
without turning starting switch ON.
C01 (female)
Between (29) – (46)
UEN00244-02
1
Resistance
3.5 – 90 kz
Min. 1 Mz
Resist-
Max. 1 z
ance
Resist-
Max. 1 z
ance
Resist-
Min. 1 Mz
ance
Voltage Max. 1 V
Resistance
3.5 – 90 kz
Min. 1 Mz
29