Komatsu Galeo PC800-8 Shop Manual page 740

SEN00793-02
Failure
• The preheater does not operate.
phenomenon
Relative • Check that the starting motor rotates normally.
information (If the starting motor does not rotate, carry out troubleshooting in "Engine does not start".)
Defective starting switch
1
(Internal disconnection)
Defective heater relay
2
(Internal disconnection)
Possible causes
and standard
value in normal
state
Defective intake air heater
3
(Internal disconnection)
Disconnection of wiring
harness
4
(Disconnection or defec-
tive contact with connector)
14
Cause Standard value in normalcy and references for troubleshooting
aTurn the engine starting switch OFF for the preparations, and hold it in
the OFF or HEAT position during troubleshooting.
H06 (male)
Between (1) – (3)
aTurn the engine starting switch OFF for the preparations (with the wir-
ing harness connected), and hold it in the OFF or HEAT position dur-
ing troubleshooting.
Heater relay
Between coil terminal –
chassis ground
Between contact
aTurn the engine starting switch OFF for the preparations, and hold it in
the OFF position during the troubleshooting.
Wiring harness between H06 (female) (3) – J02 –
heater relay terminal R17
Wiring harness between starting motor terminal
B – heater relay terminal R15
Wiring harness between heater relay terminal
R16 – intake air heater
Wiring harness between intake air heater – engine
(3) When the starting switch is turned to the HEAT
position, the heater unit is not warmed.
Starting switch
HEAT
Starting switch
HEAT
terminals
Intake air heater
Between terminals
40 Troubleshooting
Resistance
OFF Min. 1 Mz
Max. 1 z
Continuity and
resistance
OFF Continued
Max. 1 z
Continuity
Continued
Resis-
tance
Resis-
tance
Resis-
tance
Resis-
tance
PC800, 850-8
Max. 1 z
Max. 1 z
Max. 1 z
Max. 1 z