• The ABS computer can be heard powering up when the ABS circuit is selected, but no codes are
retrieved. The ABS light is on, signaling there is an Active Fault but the Alpha MUTT
®
detects no
communication from the ABS ECU on the trailer.
- This symptom can be the result of poor wire connection at the 7-way connection or the main
power connector going into the trailer ECU. Remove the connections and clean them with
the IPA
®
#CLR-90, #CLR-188 and #CLR-250 pin cleaners. Once cleaned, treat the electrical
connection with IPA
®
Contact Cleaner and Shield. These tools can be found in the IPA
®
#8048 HD Fleet Technician’s Electrical Terminal Maintenance Set.
14.2 Common System Checks
There are many safety and operational functions to test on a trailer. With the Alpha MUTT
®
, these tests
can be performed without the truck or tractor, quickly, accurately and in most cases, with only one person.
Below are a few common system checks that can be performed using the Alpha MUTT
®
.
• One-man leak and shake testing throughout the trailer.
• Pushrod travel measurements.
• Slacker adjustment reading specific to the manufacturer’s specifications on brake chamber and
proper operation notes.
• Even brake pressure activation.
• One-man, wheel-off-ground testing for brake strength and operation.
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