Komatsu PC200-8M0 Shop Manual page 837

400 Troubleshooting of electrical system (E-mode)
E-2 Preheater does not operate
Failure 3) While preheater is operating, preheating monitor does not light up.
q
"Automatic preheating" and "Manual preheating" functions are available. When either function is
Related informa-
operated, preheating monitor lights up.
tion
q
Check if manual preheating functions first.
Cause
Open circuit in wiring har-
ness
1
(Wire breakage or defective
contact)
2 Defective machine monitor
PC200, 200LC, 220, 220LC-8M0
Procedure, measuring location, criteria and remarks
1. Turn starting switch to OFF position.
2. Disconnect connectors H15, CM01, and R18, and connect T-adapters to each
female side.
Between H15 (female) (3) and CM01 (female) (16)
Between R18 (female) (5) and CM01 (female) (16)
If no failure is found by above checks, machine monitor is defective.
q
Reference
1. Turn starting switch to OFF position.
2. Insert T-adapter into connector CM01.
3. Disconnect heater relay terminal R16.
a To prevent current from flowing through heater when starting switch is turned to
HEAT position
4. Turn the starting switch to HEAT position.
Between CM01 (16) and (3)
a Between CM01(3) is ground
SEN06138-00
Max. 1 z
Resistance
Max. 1 z
Resistance
Resistance 20 to 30 V
15
40-400