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Home >> Chrysler >> 2012 >> 300 Base, Trans Mfr CD 8HP45, Gas >> Repair and Diagnosis >> Transmission >> Transmission Control Systems >> Transmission Control Module (TCM) - DTCS P1D94 To U1479 - 8HP45 Automatic Transmission >> Diagnosis And Testing >> U0121-Lost Communication With Anti-Lock Brake System (Abs) Control Module >> Theory Of Operation

Theory Of Operation

The purpose of the diagnostic is to monitor the CAN BUS and the validity of the CAN signals. Several control units are connected to the CAN BUS which send their messages cyclically in a defined time window. The messages contain multiple signals representing vehicle information.