Failure Code [Ca187] Sensor Power Supply 2 Low Error - Komatsu WA250-6 Shop Manual

SEN03842-00

Failure code [CA187] Sensor power supply 2 low error

Action code Failure code
E03
Contents of
• Low voltage is detected in sensor power supply 2 circuit.
trouble
• Fixes boost pressure and continues operation.
Action of • Fixes charge temperature and continues operation.
controller
• Limits output and continues operation.
• Turns the centralized warning lamp and alarm buzzer ON.
Problem that
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
24
40-320
Trouble
CA187
Causes
320 Troubleshooting by failure code (Display of code), Part 2
Failure code [CA187] Sensor power supply 2 low error
Sensor power supply 2 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
right in order. If mark temperature sensor
E of failure code dis-
appears after repro-
duction operation is
conducted, that
device or wiring har-
ness has a defect in
it.
Connecting parts among each sensor, engine wiring 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.)
Boost pressure, BOOST PRESS &
Common rail
FUEL RAIL PRESS
pressure sensor
Bkup sensor CAM SENSOR
Engine wiring
harness
WA250, 250PZ-6
1
IMT
EC1