Automatic Warm-Up System Does Not Operate (In Cold Season) - Komatsu PC88MR-10 Shop Manual

40 Troubleshooting
Troubleshooting of electrical system (E-mode)
E-20 Automatic warm-up system does not operate (in cold season)
FEN-400-A-Z0-A)

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

Failure
Automatic warm-up function increases engine speed to 1,300 rpm when coolant
temperature is below 30°C.
With starting switch at ON position or after engine is started, if fuel control dial is kept at
Related
70% or more of full open range for 3 seconds, automatic warm-up operation is canceled.
information
If coolant temperature is below 10°C, turbocharger protection function works to keep
engine speed below 1,000 rpm for up to 20 seconds after engine is started.
No. Cause
Defective coolant
temperature signal
1
system
Defective engine
2
controller
Engine coolant temperature gauge and engine coolant temperature monitor
40-408
Procedure, measuring location, criteria, and remarks
a Turn starting switch to ON position or start engine to perform
troubleshooting.
a If level indication of engine coolant temperature gauge differs from actual
coolant temperature, perform following troubleshooting.
E-15 Engine coolant temperature gauge display does not move from
minimum or maximum
E-16 Engine coolant temperature gauge indicates incorrect temperature
(indicates neither minimum nor maximum)
Coolant
Monitoring code 04107
temperature
(Coolant temperature)
level
If no failure is found by checks on Cause 1, engine controller is defective.
(Since this is an internal defect, troubleshooting cannot be performed.)
Coolant temperature
105°C
Coolant temperature
102°C
Coolant temperature
100°C
Coolant temperature 80°
C
Coolant temperature 60°
C
Coolant temperature 30°
C
(PC88MR-
6 (a: Red)
5 (a: Red)
4 (a: Blue)
3 (a: Blue)
2 (a: Blue)
1 (a: White)
PC88MR-10