Bus Communication

Diagnostics
In a bus system, it is necessary for all the units to be able to communicate with each other. For example, the engine cannot be started unless Trionic T7 can receive immobilizer information transmitted by TWICE.

Permanent bus faults
All communications between the diagnostic tool and systems on the bus take place via DICE. Irrespective of which system is being contacted, the diagnostic tool, with the help of DICE, will make sure that all the systems on the bus are active and communicating. The diagnostic tool will indicate any control modules missing from the bus. This means that all the control modules are communicating correctly on the bus unless the diagnostic tool warns otherwise.

Intermittent bus faults
Trionic continually checks that the TCM, TC/ABS and MIU are communicating correctly. In the event of intermittent faults on the bus communication diagnostic trouble codes will be generated. The cause of the problem can be that the control module in question has lost its power supply or one of its bus leads.

Missing control module Diagnostic trouble code
TCM P1923
MIU P1908
TC/ABS P1925





Trionic T7 uses the following information:





Trionic T7 transmits the following information: