Komatsu SAA6D114E-3 - Code [386;CA386] Sensor Sup. 1 Volt. High Error

40 Troubleshooting SEN00460-01
114E-3 Series
7
E-30 Code [386/CA386] Sensor Sup. 1 Volt. High Error 1
Circuit diagram related to sensor power supply 1
Error code Failure code
Trouble Abnormally high level in sensor power supply 1 circuit
386 CA386
Contents of
trouble
• High voltage is detected in sensor power supply 1 circuit.
Action of
controller
• Fixes atmospheric pressure and continues operation.
Problem that
appears
on machine
• Engine output drops.
• Starting performance is poor.
Related infor-
mation
• Method of reproducing failure code: Starting switch ON.
Possible
causes and
standard value
in normal state
Causes Standard value in normal state/Remarks on troubleshooting
1
Defective wiring harness
connector
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
2 Defective engine controller
If cause 1 is not detected, engine controller may be defective.
(Since trouble is in system, troubleshooting cannot be carried out.)