Code [351/Ca351] Inj. Drive Circuit Error; Troubleshooting; Troubleshooting Of Electrical System (E-Mode), Part 2 - Komatsu 114E-3 Series Shop Manual

40 Troubleshooting

Troubleshooting of electrical system (E-mode), Part 2

E-28 Code [351/CA351] INJ. Drive Circuit Error
Error code Failure code
351
Contents of
• Abnormality occurred in injector drive power supply circuit.
trouble
Action of
• Limits output and continues operation.
controller
• Exhaust smoke is black
Problem that
• There is irregular combustion.
appears
• Engine output drops.
on machine
• Engine does not start
Related infor-
• Method of reproducing failure code: Start engine.
mation
1 Defective related system
2 Defective fuse No. 19
Defective relay for engine
3
controller power supply
Possible
causes and
standard value
in normal state
Disconnection in wiring har-
ness (Disconnection in wiring
4
or defective contact in con-
nector)
5 Defective engine controller
114E-3 Series
Trouble
CA351
Causes
Abnormality in injector drive circuit
Standard value in normal state/Remarks on troubleshooting
If another failure code is indicated, carry out troubleshooting for it.
If fuse is burnt out, circuit probably has ground fault.
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
Replace relays for engine controller power supply (R23, R24) with
other relays. If mark E of failure code disappears after reproduction
operation is conducted, that relay has a defect.
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness between F01-19 – R23, R24
(female) (3)
Wiring harness between R23, R24 (female)
(5) – J3 (female) (3)
Wiring harness between J3 (female) (1) –
chassis ground (T12)
If causes 1 – 4 are not detected, engine controller may be defective.
(Since trouble is in system, troubleshooting cannot be carried out.)
SEN00460-01
1
1
Resis- Max.
0.5 z
tance
Resis- Max.
0.5 z
tance
Resis-
Max. 10 z
tance
3