Komatsu 80001 - Automatic Warm-Up System Does Not Operate (in Cold Season)

SEN04123-01 40 Troubleshooting
16 PC130-8
E-5 Automatic warm-up system does not operate (in cold season) 1
Engine coolant temperature gauge and engine
coolant temperature monitor
Trouble • Automatic warm-up system does not operate (in cold season).
Related
information
• When engine coolant temperature is below 50°C automatic warm-up system raises engine low idle
speed to 1,300 rpm.
Possible causes
and standard
value in normal
state
Cause Standard value in normal state/Remarks on troubleshooting
1
Defective engine coolant
temperature signal system
a Turn starting switch ON or start engine and carry out trouble-
shooting.
Monitoring code
Engine coolant
temperature
Coolant temperature
level
04107
Engine coolant
temperature
105°C 6 (a: Red)
102°C 5 (a: Red)
100°C 4 (a: Blue)
85°C 3 (a: Blue)
60°C 2 (a: Blue)
30°C 1 (a: White)
If level of coolant temperature gauge is different from actual cool-
ant temperature, carry out troubleshooting for E-9 Engine coolant
temperature gauge does not indicate normally.
2 Defective engine controller
If cause 1 is not detected, engine controller may be defective.
(Since trouble is in system, troubleshooting cannot be carried out.)