Engine Coolant Temperature Gauge Does Not Indicate Properly - Komatsu PC200-8M0 Shop Manual

SEN06138-00
E-8 Engine coolant temperature gauge does not indicate properly
1) While engine coolant temperature is rising properly, temperature gauge indicator does not rise
above white range (C).
Failure
2) While engine coolant temperature remains in normal range, temperature gauge indicator rises to
red range (H).
q
Signal voltage of engine coolant temperature sensor is input to engine controller and then data is
Related infor- transmitted to machine monitor through CAN communication system.
q
mation Engine coolant temperature can be checked with monitoring function
(Code: 04107 Engine coolant temperature)
Cause
Defective engine coolant
1
temperature sensor system
2 Defective machine monitor
3) Indication of engine coolant temperature gauge is different from actual engine coolant tempera-
ture.
Failure
4) Indication of engine coolant temperature gauge is different from display of engine coolant temper-
ature monitor.
q
Signal voltage of engine coolant temperature sensor is input to engine controller and then data is
Related infor- transmitted to machine monitor through CAN communication system.
q
mation Engine coolant temperature can be checked with monitoring function
(Code: 04107 Engine coolant temperature)
Cause
1 Defective machine monitor
Engine coolant temperature gauge and coolant
temperature monitor
26
40-400
E-8 Engine coolant temperature gauge does not indicate properly
Procedure, measuring location, criteria and remarks
Engine coolant temperature sensor system may be defective. Perform troubleshoot-
ing for failure codes [CA144] and [CA145].
If no failure is found by check on cause 1, machine monitor may be defective.
(Since this is an internal defect, troubleshooting cannot be performed.)
Procedure, measuring location, criteria and remarks
a Turn starting switch to ON position or start engine and perform troubleshooting.
Engine coolant tempera-
ture
105 °C
102 °C
100°C
85 °C
60 °C
30°C
400 Troubleshooting of electrical system (E-mode)
Coolant temperature
gauge level
6
5
4
3
2
1
PC200, 200LC, 220, 220LC-8M0
Color of monitor light (a)
Red
Blue
White