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Section 5
Diagnostics
Sect ion 5 Diagn ostic s
WARNINGS
To prevent serious eye injury, always wear
safe eye protection when you perform vehicle
maintenance or service.
The ABS is an electrical system. When you
work on the ABS, take the same precautions that
you must take with any electrical system to avoid
serious personal injury. As with any electrical
system, the danger of electrical shock or sparks
exists that can ignite flammable substances. You
must always disconnect the battery ground cable
before working on the electrical system.
Introduction
Blink code diagnostic procedures in this
section cover:
앫 ECU Part Number 472 500 011 0
WABCO Basic ECU without an external
diagnostic connector
앫 ECU Part Number:
WABCO ECUs with external diagnostic
connectors
This section covers Normal Mode diagnostics
(Codes for system faults that cause the ABS
warning lamp to come on and stay on when the
vehicle is in operation.)
For ECU Part Numbers 472 500 012 0 and
472 500 013 0 ONLY:
If you do not have a diagnostic blink code tool,
follow the procedure given for ECU 472 500 011 0
(see “Using the Blink Code” in this section), but
use Table E — Normal Mode Fault Code Table
to identify the fault codes.
For additional diagnostic procedures refer to:
Blink Code Diagnostics
To use blink code diagnostics you need to know
whether or not the ECU has an external diagnostic
connector. See Section 2, "System Components" in
this manual for details. If you are unable to make
this determination, contact WABCO North America
Customer Care at 855-228-3203 for assistance.
On-Site Assistance
WABCO has provided an ABS Trailer warning label
that illustrates possible system fault locations. This
label should be mounted on the trailer near the
ABS warning lamp. If there is no ABS warning
label on the trailer, let your supervisor know.
Labels are available from WABCO. Ask for Part
Number TP-95172.
472 500 001 0
472 500 012 0
472 500 013 0
Appendix A Expert Mode Diagnostics
(ECU P/Ns 472 500 001 0,
472 500 012 0, 472 500 013 0)
This mode is used to identify
intermittent faults, such as a loose
connector.
Appendix B Reconfigure Mode. Use only as
indicated in the reconfiguration
table in Appendix B.
Appendix C Warning Lamp Diagnostics
(ECU P/Ns 472 500 011 0,
472 500 012 0, 472 500 013 0)
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