Failure Code [Ca428] Abnormally High Level In Water Sensor - Komatsu WA250-6 Shop Manual

SEN03843-00

Failure code [CA428] Abnormally high level in water sensor

Action code Failure code
E01
Contents of
• High voltage occurred in fuel water sensor
trouble
Action of
• None in particular.
controller
Problem that
appears on
• Water separator monitor does not indicate normally.
machine
Related
• Method of reproducing failure code: Turn the starting switch ON.
information
1 Defective fuel water sensor
Disconnection in wiring har-
ness
2
(Disconnection or defective
contact in connector)
Possible causes
and standard
Short circuit in wiring har-
value in normal
3 ness
state
(with another wiring harness)
Defective wiring harness
4
connector
5 Defective engine controller
4
40-330
Trouble
CA428
Causes
330 Troubleshooting by failure code (Display of code), Part 3
Failure code [CA428] Abnormally high level in water sensor
Abnormally high level in water sensor
(Engine controller system)
Standard value in normal state/Remarks on troubleshooting
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
E42 (female)
Between (1) and (2)
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness between EC1 (female) (14) –
E42 (male) (1)
Wiring harness between EC1 (female) (47) –
E42 (male) (2)
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness among all pins between EC1
(female) (14) – EC1 (female) (With all con-
nectors of wiring harness disconnected)
Connecting parts among fuel water 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
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
EC1 (female)
Between (14) and (47)
1
Resistance
Max. 10 z
Resis-
Max. 10 z
tance
Resis-
Max. 10 z
tance
Resis- Min.
tance 100 kz
Resistance
Max. 10 z
WA250, 250PZ-6