User's Manual

Troubleshooting Section
Introduction
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General Information
SMCS Code: 7000
Failure of an electrical component can cause the
failure of other components. Also, failure of an
electrical component can be caused by the failure of
other components. Always attempt to correct the
cause of an electrical system failure before you
replace a component.
Note: If you suspect that there is a problem with
the Machine Security System, ensure that the
machine starting system is working properly. Use
the electrical system schematic to troubleshoot
the starting circuit.
Note: Electronic control modules seldom fail.
Perform the troubleshooting procedures that are
provided in the Troubleshooting, “Symptom
Procedures” section of this manual, before you
replace an ECM.
Test procedures progress from the most likely points
of failure to the least likely points of failure. The
procedures normally proceed in the following order:
• A component is bad.
• Wiring or connectors are bad.
• An electronic module is bad.
Each procedure assumes the following data:
• No previous troubleshooting has been performed
on the system.
• The system has not been altered.
Assume for repair:
• The batteries are fully charged and the charging
system is operating properly.
• Caterpillar
®
Electronic Technician (Cat
®
ET) is
available and the technician is trained on the
operation of Cat ET. See Troubleshooting,
“Service Tools”.
During troubleshooting, inspect all connections
before any component is replaced. If the connections
are not clean and tight, permanent electrical
problems or intermittent electrical problems can
result. Check that the wires are pushed into the
connectors completely. Make sure that the
connections are tight before other tests are made.
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Service Tools
SMCS Code: 0785
Standard Caterpillar
®
tools should be adequate for
service. The following tools are needed to
troubleshoot the Machine Security System:
Table 6
Service Tools
Part Number
Description
9U-7246
Connector Repair Kit
7X-1710
Multimeter Probe
8T-5318
Wire Removal Tool
6V-7070
Digital Multimeter
4C-4911 Battery Load Tester
In addition to the tools listed in Table 6 , a laptop
computer with the Cat
®
Electronic Technician (Cat
ET) and the communication adapter are required.
The Cat ET 2015B or later is required to use the full
security management potential of the Machine
Security System.
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Connector Locations
SMCS Code: 7553-546-WW
The locations of the components of the MSS will vary
between machines. If the MSS was installed by a
Caterpillar dealer, consult the installation instructions
for component locations. If the MSS was an
attachment that was installed at the factory, consult
the electrical schematic for that machine.
For each output use a twisted wire pair, all the way
between the MSS3s ECM and the load
(recommended).
Note: There is a need to manage shared returns,
connecting the returns together as close to the ECM
as possible. Failure to do so may result in difficulty
reading keys due to electromagnetic interference.
• The 2A drivers share a separate return.
• The 300mA drivers share a separate return.
UENR7061 17
Introduction