Failure Code [Ca331] Inj #2 (L/B#2) Open/Short Error - Komatsu ecot3 PC300LC-8 Shop Manual

40 Troubleshooting

Failure code [CA331] Inj #2 (L/B#2) Open/Short Error

Action code Failure code
E11
Contents of
• Opening or short circuit was detected in drive circuit of No. 2 injector.
trouble
Action of con-
• Turns the centralized warning lamp and alarm buzzer ON.
troller
Problem that
• Combustion becomes irregular or engine hunts.
appears on
• Engine output lowers.
machine
Related infor-
• Method of reproducing failure code: Start engine.
mation
1 Defective engine controller
2 Defective No. 2 injector
Disconnection in wiring har-
ness
3 (Disconnection in wiring or
defective contact in connec-
tor)
Ground fault in wiring har-
ness
4
Possible causes
(Short circuit with GND cir-
and standard
cuit)
value in normal
state
Short circuit in wiring har-
5 ness
(with another wiring harness)
Defective wiring harness
6
connector
7 Defective engine controller
PC300, 350-8
Trouble
CA331
Cause
Injector #2 (L/B#2) open/short circuit error
(Engine controller system)
Standard value in normal state/Remarks on troubleshooting
If following failure codes are also displayed, trouble is in engine
controller: [CA322], [CA324], [CA331]
a
Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
C9 (male)
Between (1) – (2)
Between (2) – chassis ground
a
Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
Wiring harness between CE01 (female) (54)
– C9 (female) (2)
Wiring harness between CE01 (female) (51)
– C9 (female) (1)
a
Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
Wiring harness between CE01 (female) (54)
– C9 (female) (2) and chassis ground
a
Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
Between CE01 (female) (54) – each of CE01
(female) pins (With all wiring harness con-
nectors disconnected)
Between CE01 (female) (51) – each of CE01
(female) pins (With all wiring harness con-
nectors disconnected)
Connecting parts between No. 2 injector – 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 (54) – (51)
Between (54) – chassis ground
SEN02629-03
1
Resistance
Max. 2 z
Min. 100 kz
Resis-
Max. 2 z
tance
Resis-
Max. 2 z
tance
Resis-
Max. 2 z
tance
Resis- Min.
tance 100 kz
Resis- Min.
tance 100 kz
Resistance
Max. 2 z
Min. 100 kz
59