Bus Communication

Bus Communication

System overview
For a detailed description of the car's bus system, see "Bus and diagnostic communication", System overview.


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 TCM, MIU and TC/ABS communicate correctly. If intermittent faults occur in the bus communication, fault codes will be generated. The cause of the fault can be that the control module in question has lost its power supply or one of the bus leads.

Trionic user the following informations:

Part 1:

Part 2:

Part 3:

Trionic T7 transmits the following information: