Automatic Warm-Up System Does Not Operate (In Cold Season) - Komatsu Galeo PC138US-8 Shop Manual

SEN02467-00
E-5 Automatic warm-up system does not operate (in cold season)
Trouble

• Automatic warm-up system does not operate (in cold season).

• When engine coolant temperature is below 30°C automatic warm-up system raises engine speed to
1,300 rpm.
• If fuel control dial is opened more than 70% for 3 seconds when starting switch is turned ON or after
Related
engine is started, automatic warm-up system is turned OFF. (Automatic warm-up system stops
information
automatically after operating for 10 minutes.)
• If engine coolant temperature is below 10°C turbocharger protection function operates to keep the
engine speed at low idle.
Possible causes
Defective engine coolant
and standard 1
temperature signal system
value in normal
state
2 Defective engine controller
Engine coolant temperature gauge and engine
coolant temperature monitor
14
Cause Standard value in normal state/Remarks on troubleshooting
a Turn starting switch ON or start engine and carry out trouble-
Monitoring code
Engine coolant
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.
If cause 1 is not detected, engine controller may be defective.
(Since trouble is in system, troubleshooting cannot be carried out.)
shooting.
Engine coolant
temperature
04107
temperature
40 Troubleshooting
Coolant temperature
level
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)
PC138US, USLC-8
1