Failure Code [Ca441] Battery Voltage Low Error - Komatsu ecot3 PC300LC-8 Shop Manual

SEN02630-05

Failure code [CA441] Battery Voltage Low Error

Action code Failure code
E10
Contents of
• There is low voltage in controller power supply circuit.
trouble
Action of con-
• None in particular.
troller
Problem that
• Engine stops.
appears on
• Engine does not start easily.
machine
Related infor-
• Method of reproducing failure code: Turn starting switch ON.
mation
Looseness or corrosion of
1
battery terminal
2 Defective battery voltage
3 Defective fuse No. 19
Defective relay for engine
4
controller power supply
Disconnection in wiring har-
Possible causes
ness
and standard
5 (Disconnection in wiring or
value in normal
defective contact in connec-
state
tor)
Ground fault in wiring harness
6
(Short circuit with GND circuit)
Short circuit in wiring harness
7
(with another wiring harness)
16
Trouble
CA441
Cause
Battery voltage low error
(Engine controller system)
Standard value in normal state/Remarks on troubleshooting
Battery terminal may be loosened or corroded. Check it directly.
a
Prepare with starting switch OFF, then keep starting switch
OFF and turn it to START and carry out troubleshooting in
each case.
Battery (1 piece)
Between (+) – (–) ter-
minals
If fuse is broken, circuit probably has ground fault. (See Cause 6)
a
Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
Replace relay (R23, R24) for engine controller with another relay
and perform reproducing operation. If "E" of failure code goes off at
this time, replaced relay is defective.
a
Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
Wiring harness between F01-19 – R23, R24
(female) (3)
Wiring harness between R23, R24 (female)
(5) – CE03 (female) (3)
Wiring harness between CE03 (female) (1) –
chassis ground (T11)
a
Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
Wiring harness between F01-19 – R23, R24
(female) (3) and chassis ground
Wiring harness between R23, R24 (female)
(5) – CE03 (female) (3) and chassis ground
a
Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
Between CE03 (female) (3) – CE03 (female)
(1) pins (With battery terminal disconnected)
Between CE03 (female) (3) – each of CE02
(female) pins (With battery terminal discon-
nected)
Between CE03 (female) (1) – each of CE02
(female) pins (With battery terminal discon-
nected)
40 Troubleshooting
Starting switch
OFF Min. 12 V
START Min. 6.2 V
Resis-
tance
Resis-
tance
Resis-
tance
Resis-
tance
Resis-
tance
Resis-
tance
Resis-
tance
Resis-
tance
PC300, 350-8
1
Voltage
Max. 10 z
Max. 10 z
Max. 10 z
Min.
100 kz
Max.
10 z
Min.
100 kz
Min.
100 kz
Min.
100 kz