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Home >> Saab >> 2003 >> 9-3 Vector, Automatic >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Headlights >> Lighting And Signaling Systems (Early; 9400) >> Technical Description >> System Overview, Bus And Diagnostics Communication; System Overview, Functions, Cars With Engine Management System Trionic T7 >> System overview, brief description, cars with engine management system PSG 16
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System overview, brief description, cars with engine management system PSG 16

Fig 1: System Overview - Cars With PSG 16 Engine Management System
G03579512Courtesy of SAAB-SCANIA OF AMERICA, INC.

Engine control module PSG 16 is not connected on the I-bus. This system needs much faster  communication so that there are no noticeable delays when the control module requests a new amount of fuel per injection, a new injection angle or the like.

The engine control module is connected to a separate bus called the P-bus (Powertrain Bus). The communication speed of the P-bus is ten times faster than that of the I-bus.

The P-bus is also connected to MIU. MIU is responsible for ensuring that information available on one bus is also available on the other. Note also that PSG 16 has a separate K-lead to the diagnostic tool.

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