Code [386/Ca386] Sensor Sup. 1 Volt. High Error - Komatsu 114E-3 Series Shop Manual

40 Troubleshooting
E-30 Code [386/CA386] Sensor Sup. 1 Volt. High Error
Error code Failure code
386
Contents of
• High voltage is detected in sensor power supply 1 circuit.
trouble
Action of
• Fixes atmospheric pressure and continues operation.
controller
Problem that
• Engine output drops.
appears
• Starting performance is poor.
on machine
Related infor-
• Method of reproducing failure code: Starting switch ON.
mation
Possible
Defective wiring harness
causes and 1
connector
standard value
in normal state
2 Defective engine controller
Circuit diagram related to sensor power supply 1
114E-3 Series
Trouble
CA386
Causes
Abnormally high level in sensor power supply 1 circuit
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.)
SEN00460-01
1
7