Failure Code [Ca757] Loss Of All Engine Controller Data - Komatsu Galeo BR380JG-1E0 Shop Manual

SEN02093-00

Failure code [CA757] Loss of all engine controller data

User code Failure code
E10 CA757
Contents of
• All data in engine controller are lost.
trouble
Action of
• None in particular.
controller
Problem that
• Engine may stop and may not be started again.
appears on
• Monitoring function of machine monitor (engine controller system) may not work normally.
machine
Related
• Method of reproducing failure code: Turn starting switch ON.
information
Defect in related sys-
1
tem
Looseness or corro-
2
sion of battery terminal
3 Low battery voltage
4 Defective fuse No. 19
Defective relay for
5 engine controller
power supply
Possible
causes and
standard value
in normal state
Disconnection in wiring
harness (Disconnec-
6 tion in wiring or defec-
tive contact in
connector)
Defective wiring
7
harness connector
Defective engine
8
controller
32
Loss of all engine controller data
Trouble
(Engine controller system)
Cause Standard value in normal state/Remarks on troubleshooting
If another failure code is displayed, carry out troubleshooting for it.
Battery terminal may be loosened or corroded. Check it directly.
a Prepare with starting switch OFF, then keep starting switch OFF and
start engine and carry out troubleshooting in each case.
Battery (1 piece)
Between (+) – (–) ter-
If fuse is broken, circuit probably has ground fault.
a Prepare with engine starting switch OFF, then turn engine starting
switch ON and carry out troubleshooting.
Replace relay (R21, R22) for engine controller with another relay and per-
form reproducing operation. If "E" of failure code goes off at this time,
replaced relay is defective.
a Prepare with engine starting switch OFF, then carry out troubleshooting
without turning engine starting switch ON.
Wiring harness between B28 No.3 – R21, R22
(female) (3)
Wiring harness between R21, R22 (female) (5) –
CE03 (female) (3)
Wiring harness between CE03 (female) (1) –
chassis ground (T27)
Connecting parts between fuse No.3 – machine wiring harness – engine
controller may be defective. Check them directly.
• Looseness of connector, breakage of lock, or breakage of seal
• Corrosion, bend, breakage, push-in, or expansion of pin
• Moisture or dirt in connector or defective insulation
a Prepare with engine starting switch OFF, then turn engine starting
switch ON and start engine and carry out troubleshooting in each case.
CE03 (male)
Between (3) – (1)
Starting switch
OFF
minals
START
Starting switch
START
40 Troubleshooting
Voltage
Min. 12 V
Min. 6.2 V
Resistance Max. 10 z
Resistance Max. 10 z
Resistance Max. 10 z
Voltage
ON Min. 24 V
Min. 12 V
BR380JG-1E0
1