Komatsu PC130-7, Shop Manual, Page: 243 / 342

PC130-7
20-429
TROUBLESHOOTING
Circuit diagram related to engine oil pressure switch
Trouble (2) Engine oil pressure monitor flashes.
Related
information
• If the engine oil pressure monitor detects lowering of the engine oil pressure, it flashes.
• The input state (ON/OFF) from the engine oil pressure switch can be checked with the monitoring func-
tion. (Code: 046, Center of upper line)
Possible causes
and standard
value in normal
state
Cause Standard value in normal state/Remarks on troubleshooting
1
Lowering of engine oil
pressure
(When system is normal)
Check the engine oil pressure. If it is low, repair the troubled parts.
2
Defective engine oil
pressure switch
(Internal short circuit)
a
Prepare with starting switch OFF, then hold starting switch OFF and
start engine and carry out troubleshooting.
E02 Engine Resistance
Between terminal and
chassis ground
When stopped Min. 1 M
z
When operated Max. 1
z
3
Short circuit with chassis
ground in wiring harness
(Contact with ground
circuit)
a
Prepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch.
Between P02 (female) (7) – E02 wiring harness
and chassis ground
Resistance Max. 1
z
4 Defective monitor panel
a
Prepare with starting switch OFF, then hold starting switch ON and
start engine and carry out troubleshooting.
P02 Engine Voltage
Between (7) and
chassis ground
When stopped 20 – 30 V
When operated Max. 1 V
E-15
(1)