Engine Coolant Temperature Gauge Does Not Indicate Normally - Komatsu PC130-8 Shop Manual

SEN04123-01
E-9 Engine coolant temperature gauge does not indicate normally
(1) While engine coolant temperature is rising normally, temperature gauge does not rise from white
Trouble range (C).
(2) While engine coolant temperature is stabilized normally, temperature gauge rises to red range (H).
• Signals of engine coolant temperature sensor are input to engine controller and then transmitted to
Related machine monitor through communication system.
information • Engine coolant temperature can be checked with monitoring function.
(Code: 04107 Engine coolant temperature)
Possible causes
Defective engine coolant
and standard 1
temperature sensor system
value in normal
state
2 Defective machine monitor
(3) Display of coolant temperature gauge is different from actual engine coolant temperature.
Trouble (4) Display of engine coolant temperature gauge is different from display of engine coolant tempera-
ture monitor.
• Signals of engine coolant temperature sensor are input to engine controller and then transmitted to
Related machine monitor through communication system.
information • Engine coolant temperature can be checked with monitoring function.
(Code: 04107 Engine coolant temperature)
Possible causes
and standard
value in normal
1 Defective machine monitor
state
Engine coolant temperature gauge and engine
coolant temperature monitor
26
Cause Standard value in normal state/Remarks on troubleshooting
If cause 1 is not detected, engine coolant temperature sensor sys-
tem may be defective. Carry out troubleshooting for failure codes
[CA144] and [CA145].
If cause 1 is not detected, machine monitor may be defective.
(Since trouble is in system, troubleshooting cannot be carried out.)
Cause Standard value in normal state/Remarks on troubleshooting
a Turn starting switch ON or start engine and carry out trouble-
shooting.
Engine coolant Coolant temperature
temperature
105°C
102°C
100°C
85°C
60°C
30°C
40 Troubleshooting
Color of monitor light
level (a)
6
Red
5
4
3 Blue
2
1 White
1
PC130-8