Failure Code [Dgh2Kb] Hydr Oil Sensor Short - Komatsu PC130-8 Shop Manual

SEN04121-02

Failure code [DGH2KB] Hydr oil sensor short

User code Failure code
— DGH2KB
Contents of
• Ground fault was detected in hydraulic oil temperature sensor circuit.
trouble
• Controls pump in normal mode (as when hydraulic oil temperature is 20°C to below 95°C). 
Action of
controller (Overheat prevention function does not work.)
Problem that
• While hydraulic oil temperature rises normally, hydraulic oil temperature gauge does not move from
appears on
top of white range (bottom of green range).
machine
• Signal voltage of hydraulic oil temperature sensor can be checked with monitoring function. 
Related
(Code: 04402 Hydraulic oil temperature sensor voltage)
information
• Method of reproducing failure code: Start engine.
Defective hydraulic oil tem-
1 perature sensor (Internal dis-
connection or short circuit)
Possible causes
and standard
Ground fault in wiring har-
value in normal
2 ness (Short circuit with GND
state
circuit)
3 Defective pump controller
Circuit diagram related
12
Hydraulic oil temperature sensor short
Trouble
(Pump controller system)
Cause Standard value in normal state/Remarks on troubleshooting
a Prepare with starting switch OFF, then carry out troubleshoot-
Between (2) – chassis ground
a Prepare with starting switch OFF, then carry out troubleshoot-
Wiring harness between CP01 (female) (29)
– P22 (female) (2) and chassis ground
a Prepare with starting switch OFF, then carry out troubleshoot-
Between (29) – chassis ground
ing without turning starting switch ON.
P22 (male)
Between (1) – (2)
ing without turning starting switch ON.
ing without turning starting switch ON.
CP01 (female)
Between (29) – (46)
40 Troubleshooting
1
Resistance
3.5 – 90 kz
Min. 1 Mz
Resis-
Min. 1 Mz
tance
Resistance
3.5 – 90 kz
Min. 1 Mz
PC130-8