Komatsu PC200-8M0, Shop Manual

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302 Troubleshooting by failure code, Part 2
Failure code [CA441] Battery Voltage Low Error
40-302
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PC200, 200LC, 220, 220LC-8M0
SEN06134-00
Failure code [CA441] Battery Voltage Low Error
Action
level
Failure code
Failure
Battery Voltage Low Error
(Engine controller system)
L04 CA441
Detail of failure q Low voltage appears in controller power supply circuit.
Action of con-
troller
q
None in particular
Problem on
machine
q
Engine stops.
q
Starting performance is poor.
Related infor-
mation
q Method of reproducing failure code: Turn starting switch to ON position.
q
Power supply voltage to engine controller can be checked with monitoring function.
(Code: 03203 (V))
Cause Procedure, measuring location, criteria and remarks
1 Loose or corroded battery terminal Battery cable terminal may be loose or corroded. Check it directly.
2
Loose terminal or partial open cir-
cuit at terminal
1. Turn starting switch to OFF position.
Check terminals of alternator, battery relay, ground terminal (T12), etc.
3
Defective wiring harness connec-
tor
See descriptions of wiring harness and connectors in "c: Electrical equipment"
in "Checks before troubleshooting" of "General information on troubleshoot-
ing", and check them.
4 Improper battery voltage
1. Turn starting switch to OFF position.
2. Perform troubleshooting with starting switch at OFF position and at engine
cranking.
Between battery terminals (+) and (-). Voltage 20 to 30 V
5 Defective alternator
1. Turn starting switch to OFF position.
2. Insert T-adapters into connector E12.
3. Start engine (Engine speed: Middle or faster).
Between E12 (1) and ground Voltage 27.5 to 29.5 V
6 Defective engine controller
If no failure is found by above checks, engine controller is defective. (Since
this is an internal defect, troubleshooting cannot be performed.)
q
Reference
1. Turn starting switch to OFF position and disconnect battery ground cable.
2. Insert T-adapters into connector CE03.
3. Connect battery ground cable.
4. Measure voltage with starting switch at ON position and when starting
engine.
Between CE03 (3) and
(1)
Starting switch: ON Voltage 20 to 30 V
Between CE03 (3) and
(1)
Starting switch: START Voltage Min. 12 V