Failure Code [Ca428] Water In Fuel Sensor High Error - Komatsu PC200-8M0 Shop Manual

SEN06134-00

Failure code [CA428] Water in Fuel Sensor High Error

Action
Failure code
level
L01 CA428
q
Detail of failure High voltage appears in signal circuit of water-in-fuel sensor installed to fuel pre-filter.
Action of con-
q
None in particular
troller
Problem on
q
Water separator monitor is not displayed correctly.
machine
q Signal (ON/OFF) from water-in-fuel sensor can be checked with monitoring function.
Related infor-
(Code: 18800)
mation
q
Method of reproducing failure code: Turn starting switch to ON position.
Cause
Defective wiring harness connec-
1
tor
Defective water-in-fuel sensor
2
installed to fuel pre-filter
Open or short circuit in wiring har-
3
ness
Open circuit in wiring harness
4 (wire breakage or defective con-
tact of connector)
5 Short circuit in wiring harness
6 Defective engine controller
22
40-302

Failure code [CA428] Water in Fuel Sensor High Error

Water-in-fuel Sensor High Error
Failure
(Engine controller system)
Procedure, measuring location, criteria and remarks
See descriptions of wiring harness and connectors in "c: Electrical equipment"
in "Checks before troubleshooting" of "General information on troubleshoot-
ing", and check them.
1. Turn starting switch to OFF position.
2. Disconnect connector P47, and connect T-adapters to female side.
a If water is in water separator, drain it.
Between P47 (female) (1) and (2)
1. Turn starting switch to OFF position.
2. Disconnect connector ECM and connect T-adapters to female side.
Between ECM (female) (14) and (47)
(Resistance of water-in-fuel sensor)
a If no failure is found in checks on cause 3, this check is not required.
1. Turn starting switch to OFF position.
2. Disconnect connectors ECM and P47, and connect T-adapters to each
female side.
Between ECM (female) (14) and P47 (female) (1)
Between ECM (female) (47) and P47 (female) (2)
1. Turn starting switch to OFF position.
2. Disconnect connectors ECM and P47, and connect T-adapters to female
side of ECM.
a Check with multimeter in continuity mode.
Between ECM (female) (14) and each pin other
than (14)
If no failure is found by above checks, engine controller is defective. (Since
this is an internal defect, troubleshooting cannot be performed.)
302 Troubleshooting by failure code, Part 2
Resistance Min. 100 kz
Resistance Min. 100 kz
Resistance Max. 10 z
Resistance Max. 10 z
No continuity (no sound
is heard.)
PC200, 200LC, 220, 220LC-8M0