Failure Code [Ca429] Water In Fuel Sensor Low Error - Komatsu PC200-8M0 Shop Manual

SEN06134-00

Failure code [CA429] Water in Fuel Sensor Low Error

Action
Failure code
level
L01 CA429
q
Detail of failure Low 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
Short circuit or ground fault in wir-
3
ing harness
4 Short circuit in wiring harness
Ground fault in wiring harness
5
(contact with ground circuit)
6 Defective engine controller
24
40-302
Water-in-fuel Sensor Low 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)
Between P47 (female) (1) and ground
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)
Between ECM (female) (14) and ground
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)
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 either
female side.
Between ECM (female) (14) or P47 (female) (1) and
ground
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

Failure code [CA429] Water in Fuel Sensor Low Error

PC200, 200LC, 220, 220LC-8M0
Resistance Min. 100 kz
Resistance Min. 100 kz
Resistance Min. 100 kz
Resistance Min. 100 kz
No continuity (no sound
is heard.)
Resistance Min. 100 kz