SYSTEM COVERAGE
There are two anti-lock systems used on these trucks: the TRW EBC 125 and EBC 325. EBC 125 (RWAL) is standard, two-wheel rear wheel anti-lock braking system.
EBC 325 (ABS) is optional, four-wheel anti-lock braking system.
Diagnosis of certain Front Control Module (FCM) diagnostic trouble code (DTC) related to the Adjustable Pedals System (APS) relay (if equipped) is covered in this article.