Komatsu Galeo PC800-8 User Manual

PC800, 850-8 53
40 Troubleshooting SEN00790-02
Failure code [CA271] IMV/PCV1 Short Error
Circuit diagram related to supply pump PCV1
Action code Failure code
Trouble
IMV/PCV1 Short Error
(Engine controller system)
E11 CA271
Contents of
trouble
• Short circuit was detected in PCV1 circuit of supply pump.
Action of
controller
• None in particular.
Problem that
appears on
machine
Related
information
Possible causes
and standard
value in normal
state
Cause Standard value in normal state/Remarks on troubleshooting
1
Defective supply pump
PCV1
(Internal short circuit)
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch ON.
PCV1 (male) Resistance
Between (1) – (2) 2.3 – 5.3 z
Between (1), (2) –
chassis ground
Min. 1 Mz
2
Ground fault in wiring har-
ness
(Short circuit with GND cir-
cuit)
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch ON.
Wiring harness between ENG (female) (4) –
PCV1 (female) (1) and chassis ground
Resis-
tance
Min. 1 Mz
Wiring harness between ENG (female) (5) –
PCV1 (female) (2) and chassis ground
Resis-
tance
Min. 1 Mz
3
Hot short in wiring harness
(Short circuit with 24V cir-
cuit)
aPrepare with starting switch OFF, then turn starting switch ON and
carry out troubleshooting.
Wiring harness between ENG (female) (4) –
PCV1 (female) (1) and chassis ground
Voltage Max. 1 V
Wiring harness between ENG (female) (5) –
PCV1 (female) (2) and chassis ground
Voltage Max. 1 V
4 Defective engine controller
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch ON.
ENG (female) Resistance
Between (4) – (5) 2.3 – 5.3 z
Between (4), (5) –
chassis ground
Min. 1 Mz

Komatsu Galeo PC800-8 Specifications

General

Brand	Komatsu
Model	Galeo PC800-8
Category	Excavators
Language	English