Information Contained In Troubleshooting Table - Komatsu ecot3 PC300LC-8 Shop Manual

SEN02632-02

Information contained in troubleshooting table

a Troubleshooting Table and Related Circuit Diagram collectively carry the following information. Carry out
troubleshooting work after fully grasping their contents.
Failure phe-
Phenomenon occurring on machine
nomenon
Relative infor-
Information on the failure occurred as well as the troubleshooting
mation
1
2
Possible causes
Possible causes of trouble
and standard
(Given numbers are refer-
value in normal
ence numbers, which do not
state
indicate priority)
3
4
Relative Electrical Circuit Diagram
6
Cause Standard value in normal state/Remarks on troubleshooting
<Contents of description>
• Standard value in normal state to judge possible causes
Remarks on judgment
<Troubles in wiring harness>
• Disconnection
Connector is connected imperfectly or wiring harness is bro-
ken.
• Ground fault
Wiring harness which is not connected to chassis ground
circuit is in contact with chassis ground circuit.
• Hot short
Wiring harness which is not connected to power source (24
V) circuit is in contact with power source (24 V) circuit.
• Short circuit
Independent wiring harnesses are in contact with each other
abnormally.
<Precautions for troubleshooting>
(1) Method of indicating connector No. and handling of T-
adapter
Insert or connect T-adapter as explained below for trouble-
shooting, unless otherwise specified.
• If connector No. has no marks of "male" and "female",
• If connector No. has marks of "male" and "female", dis-
(2) Entry order of pin Nos. and handling of tester leads
Connect positive (+) lead and negative (–) lead of tester as
explained below for troubleshooting, unless otherwise
specified.
• Connect positive (+) lead to pin No. or wiring harness
• Connect negative (–) lead to pin No. or harness entered
This is part of the electrical circuit diagram
which shows the portion where the failure
occurred.
• Connector No.: Indicates (Type – numbers of a
pin) (color)
• Arrow : Roughly indicates the location in the
machine where it is installed.
disconnect connector and insert T-adapters in both male
side and female side.
connect connector and connect T-adapter to only male
side or female side.
entered on front side.
on rear side.
40 Troubleshooting
1
PC300, 350-8