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P bus -vs- I bus
Posted by Gargoyle [Email] (more from Gargoyle) on Thu, 5 Aug 2010 08:11:01
In Reply to: Flooded/Replaced TWICE; electrical gremlins persist, John, Wed, 4 Aug 2010 22:39:29
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This is a quote from WIS not from personal knowledge..
All control modules in the Saab 9-5 are connected to the bus with the exception of ABS and SRS. For cars with Traction Control, the TC/ABS control module is connected to the bus.
The bus allows large quantities of data to be sent between the control modules on only two cables. The bus is divided into a Power train bus (P bus) and an Instrument bus (I bus).
Trionic, TCM and TC/ABS power train systems require fast data communication so that no noticeable delay occurs, e.g. for torque limitation when changing gears.
Trionic, TCM and TC/ABS are connected to the P bus, on which data transfer is ten times faster than on the I bus.
The P bus and I bus are connect to the MIU. The MIU is responsible for making information on one bus available to the other bus.
The diagnostic instrument is not connected directly to the bus but communicates via the DICE, one of the control modules connected to the I bus, and so has access to all control modules connected to the bus.
Vehicle speed data is important for man control modules. Since the ABS is not connected to the bus, the vehicle speed signal is sent on a seperate lead from the ABS to the MIU. The MIU then sends the data over the busses. In cars with Traction Control, the TC/ABS sends vehicle speeddata to the MIU via the P bus.
(sorry you asked yet?)
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