Failure Code [Ca441] Battery Voltage Low Error - Komatsu PC88MR-10 Shop Manual

Failure code [CA441] Battery Voltage Low Error

Action level Failure code
L04 CA441
Detail of
Low voltage occurs in engine controller power circuit.
failure
Action of
Sets power supply voltage to fixed value (24 V) and runs engine.
controller
Engine stops (if engine is running).
Problem on
Engine startability is poor (if engine is stopped).
machine
Method of reproducing failure code: Turn starting switch to ON position.
Related
Power supply voltage of engine controller can be checked with monitoring function.
information
(Code: 03204(V))
No. Cause
Loose or corroded
1
battery terminal
Loose terminal or partial
2
open circuit at terminal
Defective wiring
3 harness connector
Improper battery
4
voltage
5
Defective alternator
Defective engine
6
controller
PC88MR-10
Battery Voltage Low Error
Failure
(Engine controller system)
Procedure, measuring location, criteria and remarks
Battery terminal may be loose or corroded. Check it directly.
1. Turn starting switch to OFF position.
Check terminals of alternator, battery relay, ground terminal (T12), etc.
See descriptions of wiring harness and connectors in "c: Electrical equipment"
in "Checks before troubleshooting" of "Related information on
troubleshooting", and check it.
1. Turn starting switch to OFF position.
2. Perform troubleshooting with starting switch at OFF position and when
starting engine.
Voltage Between battery terminals (+) and (-).
1. Turn starting switch to OFF position.
2. Insert T-adapter into connector E12.
3. Start engine. (Engine speed: Middle or faster)
Between ground and E12 (1) or alternator R
Voltage
Terminal (16)
If no failure is found by above checks, engine controller is defective.
(Since this is an internal defect, troubleshooting cannot be performed.)
Reference
1. Turn starting switch to OFF position, and set battery disconnect switch to
OFF position.
2. Insert T-adapter into connector CE03.
3. Turn battery disconnect switch to ON position.
4. Measure voltage with starting switch at OFF position and when starting
engine.
Between CE03 (1) and (21)
Between CE03 (2) and (22)
Voltage
Between CE03 (11) and (31)
Between CE03 (12) and (32)
40 Troubleshooting
Troubleshooting by failure code (Display of code)
(PC88MR-CA441-400-A-Z0-A)
20 to 30 V
27.5 to 29.5
V
20 to 30 V
20 to 30 V
20 to 30 V
20 to 30 V
40-175