Failure Code [Ca352] Sensor Power Supply 1 Low Error - Komatsu WA250-6 Shop Manual

SEN03842-00

Failure code [CA352] Sensor power supply 1 low error

Action code Failure code
E03
Contents of
• Low voltage is detected in sensor power supply 1 (5V) circuit.
trouble
Action of • Fixes atmospheric pressure and continues operation.
controller
• Turns the centralized warning lamp and alarm buzzer ON.
Problem that
• Starting performance is poor.
appears on
• Engine output drops.
machine
Related
• Method of reproducing failure code: Turn the starting switch ON.
information
Defective sensor or wiring
1
harness
Possible causes
and standard
value in normal
state
Defective wiring harness
2
connector
3 Defective engine controller
52
40-320
Trouble
CA352
Causes
320 Troubleshooting by failure code (Display of code), Part 2
Failure code [CA352] Sensor power supply 1 low error
Sensor power supply 1 low error
(Engine controller system)
Standard value in normal state/Remarks on troubleshooting
a Disconnect connector with starting switch OFF, then turn starting
switch ON and carry out troubleshooting.
Disconnect devices at Atmospheric pres-
right in order. If failure
code disappears after
reproduction opera-
tion is conducted, that
device or wiring har-
ness has a defect in
it.
Connecting parts among atmospheric pressure sensor, engine wir-
ing harness, and engine controller are suspected. Inspect them
directly.
• Loose connector, broken lock, broken seal
• Corrosive, bent, broken, forced-in, or extended pin
• Humidity in connector, entry of dirt or dust, poor insulation
If causes 1 – 2 are not detected, engine controller may be defective.
(Since trouble is in system, troubleshooting cannot be carried out.)
AMBAIR PRESSURE
sure sensor
Engine wiring
harness
WA250, 250PZ-6
1
EC1