Failure Code [Ca271] Imv/Pcv1 Short Error - Komatsu ecot3 PC300LC-8 Shop Manual

40 Troubleshooting

Failure code [CA271] IMV/PCV1 Short Error

Action code Failure code
E10
Contents of
• Short circuit was detected in drive circuit of supply pump actuator.
trouble
Action of con-
• None in particular.
troller
Problem that • Engine speed does not rise from low idle.
appears on • Engine output lowers.
machine • Common rail fuel pressure rises above command value.
Related infor-
• Method of reproducing failure code: Turn starting switch ON.
mation
Defective supply pump actu-
1
ator
Hot short in wiring harness
2
(Short circuit with 24V circuit)
Possible causes
Short circuit in wiring har-
and standard
3 ness
value in normal
(with another wiring harness)
state
Defective wiring harness
4
connector
5 Defective engine controller
Circuit diagram related to supply pump actuator (metering unit)
PC300, 350-8
Trouble
CA271
Cause
IMV/PCV1 short error
(Engine controller system)
Standard value in normal state/Remarks on troubleshooting
a
Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
C17 (male)
Between (1) – chassis ground
a
Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
Wiring harness between CE01 (female) (2) –
C17 (female) (1) and chassis ground
a
Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
Between CE01 (female) (2) – each of CE01
(female) pins (With all wiring harness con-
nectors disconnected)
Connecting parts between supply pump actuator – engine wiring
harness – engine controller may be defective. Check them directly.
• Looseness of connector, breakage of lock, or breakage of seal
• Corrosion, bend, breakage, push-in, or expansion of pin
• Moisture or dirt in connector or defective insulation
a
Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
CE01 (female)
Between (2) – chassis ground
SEN02629-03
1
Resistance
Min. 100 kz
Voltage Max. 3 V
Resis- Min.
tance 100 kz
Resistance
Min. 100 kz
47