Failure Code [Dgh2Kb] Hydr Oil Sensor Short - Komatsu ecot3 PC300LC-8 Shop Manual

SEN02631-02

Failure code [DGH2KB] Hydr Oil Sensor Short

Action code Failure code
— DGH2KB
Contents of
• Ground fault was detected in hydraulic oil temperature sensor circuit.
trouble
Action of • Fixes hydraulic oil temperature value at 40°C and continues operation.
controller • If cause of failure disappears, system resets itself.
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 infor-
(Code: 04402 Hydraulic oil temperature sensor voltage)
mation
• 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 to hydraulic oil temperature sensor
6
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 troubleshooting
without turning starting switch ON.
Between (2) – chassis ground
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness between CP01 (female) (29)
– P22 (female) (2)
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Between (29) – chassis ground
P22 (male)
Between (1) – (2)
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
PC300, 350-8