Komatsu Galeo PC800-8 Shop Manual page 738

SEN00793-02
Failure
• The preheater does not operate.
phenomenon
• The preheating monitor starts lighting when the starting switch is turned to the HEAT position. After about
Relative 30 seconds, it start flashing to notify that preheating is finished (It stops flashing in about 10 seconds).
information • Input of the preheating signal (ON or OFF) can be checked in the monitoring function.
(Code No. 04500: Monitor input 1)
Defective starting switch
1
system
Disconnection of wiring
harness
Possible causes
2 (Disconnection or
and standard
defective contact with con-
value in normal
nector)
state
3 Defective machine monitor
12
Cause Standard value in normalcy and references for troubleshooting
If the preheater does not operate (the heater unit is not warmed), carry
out troubleshooting (2).
aTurn the engine starting switch OFF for the preparations, and hold it in
the OFF position during the troubleshooting.
Wiring harness between CM02 (female) (18) –
J02 (female) (7)
aTurn the engine starting switch OFF for the preparations, and hold it in
the OFF or HEAT position during troubleshooting.
(18) – chassis ground
(2) When the starting switch is turned to the HEAT posi-
tion, the preheating monitor does not light up.
CM02 Starting switch
Between
HEAT
40 Troubleshooting
Resis-
tance
Voltage
OFF Max. 1 V
20 – 30 V
PC800, 850-8
Max. 1 z