Komatsu PC200-8M0, Shop Manual

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200 General Information on troubleshooting
Information in troubleshooting table
40-200
12
PC200, 200LC, 220, 220LC-8M0
SEN06132-01
Information in troubleshooting table
(Rev. 2011/12)
a
The following information is summarized in the troubleshooting table. Before performing troubleshooting,
understand that information fully.
Action level Failure code
Failure
Failure name displayed on the Abnormality Record screen of the
machine monitor Display on
machine
monitor
Display on
machine monitor
Detail of
failure
Description of the failure detected by the machine monitor or controller
Action of
controller
An action that is performed to protect the system and devices when a failure is detected by the machine
monitor or controller
Problem on
machine
A problem that appears as a failure on the machine as a result of an action (above) that is performed by
the machine monitor or controller.
Related
information
Information on occurred failure or troubleshooting
Cause Procedure, measuring location, criteria and remarks
1 Defective -
<Contents of description>
q Procedure
q
Measuring location
a
"Between A and B" denotes measuring values such as voltage and resistance
between 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
If a defect is found and repaired, check that the defect has been corrected.
<Failures in wiring harness>
q
Open circuit in wiring
Connection of connector is defective or wiring harness is broken.
q
Ground fault
A harness not to be connected to the ground (earth) circuit comes into contact with
the ground (earth) circuit or chassis accidentally.
q Hot short circuit
A harness not to be connected to the power (24 V) circuit comes into contact with
the power (24 V) circuit accidentally.
q
Short circuit
An independent wire in the harness erroneously comes into contact with another
independent 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) Pin number description sequence and tester lead handling
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.
2
Open or short circuit in wir-
ing harness
3
Open circuit in wiring har-
ness
(wire breakage or defective
contact of connector)
4
Ground fault in wiring har-
ness
(contact with ground circuit)
5
Hot short circuit
(contact with 24 V circuit)
6
Short circuit in wiring har-
ness
7 Defective controller