Code [428/Ca428] Water Sensor High Level Error - Komatsu 114E-3 Series Shop Manual

SEN00460-01
E-31 Code [428/CA428] Water Sensor High Level Error
Error code Failure code
428
Contents of
• High voltage occurred in water-in-fuel sensor
trouble
Action of con-
• None in particular.
troller
Problem that
appears on • Water separator monitor does not indicate normally.
machine
Related infor-
• Method of reproducing failure code: Starting switch ON.
mation
Defective water-in-fuel sen-
1
sor
Disconnection in wiring har-
ness (Disconnection in wiring
2
or defective contact in con-
nector)
Possible causes
and standard
value in normal
Short circuit in wiring har-
state
3 ness (With another wiring
harness)
Defective wiring harness
4
connector
5 Defective engine controller
8
Trouble
CA428
Causes
Abnormally high level in water sensor
Standard value in normal state/Remarks on troubleshooting
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
P47 (female)
Between (1) – (2)
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness between J1 (female) (14) –
P47 (male) (1)
Wiring harness between J1 (female) (47) –
P47 (male) (2)
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness among all pins between J1
(female) (14) – J1 (female) (With all connec-
tors of wiring harness disconnected)
Connecting parts among water-in-fuel sensor, engine wiring har-
ness, 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.
J1 (female)
Between (14) – (47)
40 Troubleshooting
1
Resistance
Max. 10 z
Resis-
Max. 10 z
tance
Resis-
Max. 10 z
tance
Resis- Min.
tance 100 kz
Resistance
Max. 10 z
114E-3 Series