9-3 SE Sedan (9400) L4-2.0L Turbo (B204) HO (1999)
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P-BUS AND I-BUS
A smaller number of control modules in the Saab 9-3 are connected to the bus system compared with the Saab 9-5.
The two power train systems EDC and diesel pump are not connected to the I-bus. These systems require much faster communication so that no
discernible delays occur, e.g. when EDC requests a certain amount of fuel for injection.
Therefore, they are connected to a separate bus called the P-bus (Powertrain Bus). The P-bus communicates ten times faster than the I-bus.
In addition, the P-bus is also connected to the MIU (the main instrument display panel). The MIU is responsible for making the information
available on one bus also available on the other bus.
Bus Communication
