Failure Code [Dgh2Kb] Hydr. Oil Temp. Sensor S/C - Komatsu Galeo PC800-8 Shop Manual

SEN00791-02

Failure code [DGH2KB] Hydr. Oil Temp. Sensor S/C

Action code Failure code
— DGH2KB
Contents of
• The signal of the hydraulic oil temperature sensor rises above 102°C while the engine is running.
trouble
Action of
• None in particular.
controller
Problem that
appears on • If the machine is used as it is, the hydraulic equipment may be damaged.
machine
• If the hydraulic oil temperature monitor on the machine monitor lights up in red while the engine is run-
Related ning, this failure code is recorded.
information • Input from the hydraulic oil temperature sensor can be checked in the monitoring function.
(Code No. 04401: Hydraulic oil temperature, 04402: Hydraulic oil temperature sensor voltage
Hydraulic oil overheated
1
(While system is normal)
Hydraulic oil temperature
2 sensor defective
(Internal short-circuiting)
Possible causes
and standard
value in normal
Grounding fault of wiring
state
harness
3
(Contact with grounding cir-
cuit)
4 Machine monitor defective
72
Hydr. Oil Temp. Sensor S/C
Trouble
(Mechanical system)
Cause
Check the hydraulic oil for overheating. If it has been overheated, find
out the cause and check the hydraulic equipment for damage, then
repair.
aTurn the engine starting switch OFF for the preparations, and hold it in
the OFF position during the troubleshooting.
Between (1) – (2)
Between (1) – chassis
aTurn the engine starting switch OFF for the preparations, and hold it in
the OFF position during the troubleshooting.
Between 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)
Between (12) –
chassis ground
Standard value in normal state/Remarks on troubleshooting
Hydraulic oil tempera-
P22 (male)
10 – 100°C
ground
Hydraulic oil tempera-
10 – 100°C
40 Troubleshooting
Resistance
ture
90 – 3.5 kz
Min. 1 Mz
Resis-
tance
Resistance
ture
90 – 3.5 kz
Min. 1 Mz
PC800, 850-8
Min. 1 Mz