Failure Code [Dgr2Kb] Brake Oil Temperature Sensor: Ground Fault - Komatsu WA250-6 Shop Manual

360 Troubleshooting by failure code (Display of code), Part 6

Failure code [DGR2KB] Brake oil temperature sensor: Ground fault

Failure code [DGR2KB] Brake oil temperature sensor: Ground fault
Action code Failure code
E01 DGR2KB
Contents of
• Front brake oil temperature above 150°C was detected.
trouble
(Ground fault was detected in front brake oil temperature signal circuit.)
Action of
• Brake oil overheat is not detected.
machine monitor
Problem that
• Brake oil temperature gauge indicates upper limit.
appears on
• Brake performance lowers (while system is normal).
machine
• Input state from front brake oil temperature sensor can be checked with monitoring function.
Related (Monitoring code: MONITOR PANEL – 30201 – F BRAKE OIL (°C)
information (Monitoring code: MONITOR PANEL – 30204 – F BRAKE OIL (V)
• System resets itself after brake oil temperature reduces below 130°C.
Front brake overheat
1
(When system is normal)
Defective front brake (axle)
2 oil temperature sensor (Inter-
nal defect)
Possible causes
and standard
value in normal
state
Ground fault in wiring har-
3 ness (Contact with GND cir-
cuit)
4 Defective machine monitor
Related circuit diagram
WA250, 250PZ-6
Brake oil temperature sensor: Ground fault
Trouble
(Machine monitor system)
Causes
Check for cause of overheat directly.
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Between (1) – (2)
Between (1) (2) and
Between wiring harness F14 (female) (1) –
L28 (female) (7) and ground
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
Between L28 (7) –
Standard value in normal state/Remarks on troubleshooting
F14 (male) Brake oil temperature
– (Anytime)
ground
L25, L28 Brake oil temperature
L25 (9)
SEN03846-00
Resistance
At 25°C 35 – 50 kz
At 100°C 3.1 – 4.5 kz
Min. 1 Mz
Resis-
tance
Voltage
At 25°C 4.4 – 4.6 V
At 100°C 2.1 – 2.3 V
Min. 1 Mz
9
40-360