PART 10: ABS DIAGNOSTICS
10.1 Accessing ABS Codes
The Alpha MUTT
®
is equipped with integrated ABS diagnostics and allows for the ability to access and
clear ABS fault codes. The Alpha MUTT
®
allows a technician to access ABS diagnostics via the control
panel LCD screen or software app on the tablet.
ABS Explained
Modern trailers with ABS systems store fault codes when an error or malfunction occurs. Trailers with
ABS systems typically have an amber colored light labeled “ABS” located on the road side of the trailer.
When an active fault is present, this light will illuminate, alerting the driver or technician that there is an
active fault within the ABS system. When an ABS fault is active, the problem must be resolved, and the
ABS light cleared in order for the trailer to pass inspection. ABS system faults are often associated with
open circuits and loss of communication to the wheel speed sensors, or loss of power to the ABS ECU.
While there are several ABS manufacturers, they all generally follow the SAE recommendations for how
to display codes. These codes are traditionally accessed through two methods.
The simple analog method is commonly referred to as the Blink Code Method. Each manufacturer differs
in the way blink codes are initiated. Blink codes are a slower and more tedious way of retrieving ABS
information with the major deficiency being most manufacturers do not allow you to clear codes via the
Blink Code Method.
The method of using a scan tool to retrieve codes is commonly referred to as the Digital Fault Method.
Digital fault codes can be viewed along with the definition of the fault on the screen which improves
troubleshooting time. The Digital Method also allows for codes to be cleared which prevents the technician
from having to jack up the trailer and spin the wheels or pull it down the road just to clear a code.
SUPPORT LINKS AND INFORMATION: If you suspect an issue with the tester’s software or
hardware please call IPA
®
at 888-786-7899 or email tech247@ipatools.com.
For issues with the trailer or ECU modules, please contact the ABS ECU Manufacturer. The most
common manufacturers are Meritor (www.meritor.com), WABCO (www.wabco-auto.com), Haldex
(www.haldex.com), Bendix (www.bendix.com) and Gen2 (www.den2abs.com).
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