Information Contained In Troubleshooting Table - Komatsu PC200-8M0 Shop Manual

SEN06138-00

Information contained in troubleshooting table

a The following information is summarized in the troubleshooting table and the related electrical circuit dia-
gram. Before performing troubleshooting, understand that information fully.
Failure Problem on machine
Related infor-
Information related to the detected failure or troubleshooting
mation
Cause
1 defective-
Open or short circuit in wir-
2
ing harness
Open circuit in wiring har-
ness
3
(wire breakage or defective
contact of connector)
Ground fault in wiring har-
4 ness
(contact with ground circuit)
Hot short circuit
5
(contact with 24 V circuit)
Short circuit in wiring har-
6
ness
7 Defective controller
6
40-400
Procedure, measuring location, criteria and remarks
<Details of description>
q
Procedure
q
Measuring location
a "Between A and B" means the measurement of voltage, resistance or others
between terminals A and B.
a "Between A and ground" means the measurement of voltage, resistance or
others between terminal A and the place which has a continuity with chassis
frame such as unpainted hexagonal head bolt or bolt hole which has no rust,
etc.
q Criteria to judge probable causes (standard value), remarks
<How to use troubleshooting sheet>
q Perform troubleshooting procedures in numerical order.
q
If the check result does not meet the criteria, the probable cause described on the
left column is the actual cause of the failure.
q
If the check result shows no failure, and unless otherwise specified, proceed to the
next step (next cause item).
q
Check that the failure is fixed after the failure was found and repaired.
<Failures in wiring harness>
q
Open circuit in wiring
The connector connection is defective or the wire is broken.
q
Ground fault
A harness not connected to the ground circuit contacts with the ground wiring or
machine.
q
Hot short circuit
A harness not connected to the power (24 V) circuit contacts with the power (24 V)
circuit.
q
Short circuit
An independent wire in the wiring harness contacts with other wire.
(poor insulation at connector and others)
<Precautions for troubleshooting>
(1) Connector number indication method and handling of T-adapter
For troubleshooting, insert or connect T-adapter as follows unless otherwise spec-
ified.
q
When "male" or "female" is not indicated with a connector number, disconnect
the connector, and insert T-adapter between the male and female connectors.
q
When "male" or "female" is indicated with a connector number, disconnect the
connector, and connect T-adapter only to either male or female connector.
(2) Description sequence of pin number and handling of tester lead
For troubleshooting, connect the positive (+) and negative (-) leads as shown be-
low unless otherwise specified.
q
Connect the positive (+) lead to pin or wire indicated first.
q
Connect the negative (-) lead to a pin or wire indicated second.
400 Troubleshooting of electrical system (E-mode)
Information contained in troubleshooting table
PC200, 200LC, 220, 220LC-8M0
(Rev. 2012/2)