Failure Code [Ca351] Injectors Drive Circuit Error - Komatsu WA250-6 Shop Manual

SEN03842-00

Failure code [CA351] Injectors drive circuit error

Action code Failure code
E03
Contents of
• Abnormality occurred in injector drive power supply circuit.
trouble
Action of • Limits output and continues operation (limits common rail pressure).
controller
• Turns the centralized warning lamp and alarm buzzer ON.
• Exhaust smoke is black.
Problem that
• There is irregular combustion.
appears on
• Engine output drops.
machine
• The engine does not start.
Related
• Method of reproducing failure code: Start engine
information
1 Defect in related system
Defective fuse No. 4 of fuse
2
box FS1
Defective engine control cut-
3 out relay (L107) (Internal dis-
connection or short circuit)
Possible causes
and standard
value in normal
Defective engine control cut-
state
4 out relay (L108) (Internal dis-
connection or short circuit)
Disconnection in wiring har-
ness
5
(Disconnection or defective
contact in connector)
6 Defective engine controller
50
40-320
Trouble
CA351
Causes
320 Troubleshooting by failure code (Display of code), Part 2
Failure code [CA351] Injectors drive circuit error
Injectors drive circuit error
(Engine controller system)
Standard value in normal state/Remarks on troubleshooting
If another code is displayed, carry out troubleshooting for it.
If the fuse is broken, the circuit probably has a grounding fault, etc.
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
L107 (Male)
Between (1) and (2)
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
When engine control cut-out relay (L107) is replaced with a relay of
the same type, if the condition becomes normal, the engine control
cut-out relay 1 is defective.
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
L108 (male)
Between (1) and (2)
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
When engine control cut-out relay (L108) is replaced with a relay of
the same type, if the condition becomes normal, the engine control
cut-out relay 2 is defective.
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness between fuse No. 4 of fuse
box FS1 – L107, L108 (female) (3)
Wiring harness between L107 (female) (5),
L108 (female) (5) – EC3 (female) (3), (4)
Wiring harness between EC3 (female) (1),
(2) – ground
If causes 1 – 5 are not detected, engine controller may be defective.
(Since trouble is in the system, troubleshooting cannot be carried
out.)
1
Resistance
200 – 400 z
Resistance
200 – 400 z
Resis- Max.
0.5 z
tance
Resis- Max.
tance 0.5 z
Resis- Max.
tance 10 z
WA250, 250PZ-6