Error Code [108] (Overheating Of Engine Coolant) - Komatsu PC130-7 Shop Manual

TROUBLESHOOTING

Error code [108] (Overheating of engine coolant)

User code Error code
– 108
Contents of • The signal circuit of the engine coolant temperature sensor inputs 99 o or higher temperature while the
trouble engine is running.
Action of
• None in particular.
monitor panel
Problem that
appears on • If the machine is operated as it is, the engine may be seized.
machine
• If the engine coolant temperature monitor of the monitor panel flashes while the engine is running, this
Related error code is recorded.
information • The input state (ON/OFF) from the engine coolant temperature sensor can be checked with the moni-
toring function. (Code: 041, by 10 mV)
Overheating of engine
1
(When system is normal)
Defective engine coolant
2 temperature sensor (Inter-
nal short circuit)
Possible causes
and standard
value in normal
Short circuit with chassis
state
ground in wiring harness
3
(Contact with ground cir-
cuit)
4 Defective monitor panel
Circuit diagram related to engine coolant temperature sensor
PC130-7
Trouble Overheating of engine coolant (Monitor panel system)
Cause Standard value in normal state/Remarks on troubleshooting
The engine may have overheated. Find the cause and check the
engine for damage, and then repair.
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch.
E05 (male)
Between (1) and (2)
Between (2) and
chassis ground
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch.
Between P02 (female) (1) – E05 (female) (2)
wiring harness and chassis ground
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch.
Between (1) and (13)
Between (1) and
chassis ground
Engine coolant
temperature
10 – 100 °C
Engine coolant
P02
temperature
10 – 100 °C
[108]
Resistance
3.5k – 90 kz
Min. 1 Mz
Min. 1 Mz
Resistance
Resistance
3.5k – 90 kz
Min. 1 Mz
20-311
(1)