9-3 Convertible (9400) L4-2.0L Turbo (2.0 HOT) (2003)
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All Saab 9-3 from M01 are equipped with the Trionic T7 engine management system. The bus system is therefore almost identical to the one fitted on
the 9-5.
The bus system on diesel cars with EDC15 and diesel pump is unchanged from M98 1/2 and on cars with PSG 16 from M01 1/2.
The two diesel engine systems EDC/diesel pump and PSG 16 are not connected to the bus however. These systems require considerably faster
communication to avoid any noticeable delays, e.g. when EDC or PSG requests a certain amount of fuel for injection.
Therefore, they are connected through a separate buss called the P-bus (Powertrain Bus). The P-bus has a data transfer rate ten times higher than that of
the I-bus.
The P-bus is also connected to the MIU (Main Instrument Unit). The MIU ensures that the information that is available on one bus is also available on
the other.
Bus Communication
Bus Communication
Bus communication, Trionic T7
