Komatsu BR380JG-1E0, Shop Manual, Page: 600 / 841

SEN02092-00 40 Troubleshooting
42
BR380JG-1E0
Failure code [CA322] Disconnection or short circuit in injector No.1 1
User code Failure code
Trouble
Disconnection or short circuit in injector No.1
(Engine controller system)
E11 CA322
Contents of
trouble
• Opening or short circuit was detected in drive circuit of No. 1 injector.
Action of
controller
• None in particular.
Problem that
appears on
machine
• Combustion becomes irregular or engine hunts.
• Engine output lowers.
Related
information
• Method of reproducing failure code: Start engine.
Possible causes
and standard
value in normal
state
Cause Standard value in normal state/Remarks on troubleshooting
1 Defective No. 1 injector
a
Prepare with engine starting switch OFF, then carry out troubleshooting
without turning engine starting switch ON.
INJ CYL 1 (male) Resistance
Between (1) – (2) Max. 2
z
Between (1) – chassis ground Min. 100 k
z
2
Disconnection in wir-
ing harness (Discon-
nection in wiring or
defective contact in
connector)
a
Prepare with engine starting switch OFF, then carry out troubleshooting
without turning engine starting switch ON.
Wiring harness between CE01 (female) (45) –
INJ CYL 1 (female) (1)
Resistance Max. 2
z
Wiring harness between CE01 (female) (53) –
INJ CYL 1 (female) (2)
Resistance Max. 2
z
3
Ground fault in wiring
harness (Short circuit
with GND circuit)
a
Prepare with engine starting switch OFF, then carry out troubleshooting
without turning engine starting switch ON.
Wiring harness between CE01 (female) (45) –
INJ CYL 1 (female) (1)
Resistance Max. 2
z
4
Short circuit in wiring
harness (with another
wiring harness)
a
Prepare with engine starting switch OFF, then carry out troubleshooting
without turning engine starting switch ON.
Wiring harness between CE01 (female) (45) –
each of CE01 (female) pins (With all wiring har-
ness connectors disconnected)
Resistance Min. 100 k
z
Wiring harness between CE01 (female) (53) –
each of CE01 (female) pins (With all wiring har-
ness connectors disconnected)
Resistance Min. 100 k
z
5
Defective wiring har-
ness connector
Connecting parts between No. 1 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
6
Defective injector of
other cylinder or defec-
tive harness
If the failure codes related to injector are indicated, carry out troubleshoot-
ing for them, too.
7
Defective engine
controller
a
Prepare with engine starting switch OFF, then carry out troubleshooting
without turning engine starting switch ON.
CE01 (male) Resistance
Between (45) – (53) Max. 2
z
Between (45) – chassis ground Min. 100 k
z