Code [442/Ca442] Supply Voltage High Error - Komatsu 114E-3 Series Shop Manual

SEN00460-01
E-37 Code [442/CA442] Supply Voltage High Error
Error code Failure code
442
Contents of
• High voltage (min. 36 V) occurred in controller power supply circuit.
trouble
Action of
• None in particular.
controller
Problem that
appears • Engine may stop.
on machine
Related infor-
• Method of reproducing failure code: Starting switch ON.
mation
1 Defective battery voltage
Possible
causes and
standard value
2 Defective alternator
in normal state
3 Defective engine controller
20
Trouble
CA442
Causes
Abnormally high power supply voltage
Standard value in normal state/Remarks on troubleshooting
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Battery
Between (+) – (–) terminals
a Prepare with starting switch OFF, then start the engine and carry
out troubleshooting.
E12 (Male)
Between (1) –
Min. medium speed
chassis ground
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
J3 (Female)
Between (3) – (1)
40 Troubleshooting
Voltage
Max. 32 V
Engine speed
27.5 – 29.5 V
Voltage
Max. 32 V
114E-3 Series
1
Voltage