Failure Code [Ca386] Sensor Power Supply 1 High Error - Komatsu WA250-6 Shop Manual

SEN03842-00

Failure code [CA386] Sensor power supply 1 high error

Action code Failure code
E03
Contents of
• High 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
Possible causes
Defective wiring harness
and standard 1
connector
value in normal
state
2 Defective engine controller
Related circuit diagram
54
40-320
Trouble
CA386
Causes
320 Troubleshooting by failure code (Display of code), Part 2
Failure code [CA386] Sensor power supply 1 high error
Sensor power supply 1 high error
(Engine controller system)
Standard value in normal state/Remarks on troubleshooting
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 cause 1 is not detected, engine controller may be defective.
(Since trouble is in system, troubleshooting cannot be carried out.)
1
WA250, 250PZ-6