Komatsu 114E-3 Series, Shop Manual

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SEN00459-01 40 Troubleshooting
46
114E-3 Series
E-26 Code [332/CA332] Injector No. 4 System Open/Short Error 1
Error code Failure code
Trouble Disconnection, short circuit in injector No. 4
332 CA332
Contents of
trouble
• There is disconnection or short circuit in drive circuit of injector No. 4.
Action of con-
troller
• None in particular.
Problem that
appears on
machine
• There is irregular combustion or hunting.
• Output drops.
Related infor-
mation
• Method of reproducing failure code: Start engine.
Possible causes
and standard
value in normal
state
Causes Standard value in normal state/Remarks on troubleshooting
1 Defective injector No. 4
a
Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
INJ CYL 3 & 4 (Male) Resistance
Between (1) – (2) Max. 2
z
Between (2) – chassis ground Min. 100 k
z
2
Disconnection in wiring har-
ness (Disconnection in wiring
or defective contact in con-
nector)
a
Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness between J1 (female) (56) –
INJ CYL 3 & 4 (female) (2) Resis-
tance
Max. 2
z
Wiring harness between J1 (female) (58) –
INJ CYL 3 & 4 (female) (1) Resis-
tance
Max. 2
z
3
Ground fault in wiring har-
ness (Short circuit with GND
circuit)
a
Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness between J1 (female) (56) –
INJ CYL 3 & 4 (female) (2) Resis-
tance
Max. 2
z
4
Short circuit in wiring harness
(With another wiring harness)
a
Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness among all pins between J1
(female) (56) – J1 (female) (With all connec-
tors of wiring harness disconnected)
Resis-
tance
Min.
100 k
z
Wiring harness among all pins between J1
(female) (58) – J1 (female) (With all connec-
tors of wiring harness disconnected)
Resis-
tance
Min.
100 k
z
5
Defective wiring harness
connector
Connecting parts among injector No. 4, engine wiring harness, and
engine controller are suspected. Inspect them directly.
• Loose connector, broken lock, broken seal
• Corrosive, bent, broken, forced-in, or extended pin
• Humidity in connector, entry of dirt or dust, poor insulation
6
Defective injector or wiring
harness of another cylinder If any other failure codes related to injector are displayed, carry out
troubleshooting for them first.
7 Defective engine controller
a
Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
J1 (female) Resistance
Between (56) – (58) Max. 2
z
Between (56) – chassis ground Min. 100 k
z