System overview

System overview

System overview, operation, petrol engine variants except Viggen

System overview, operation, diesel engine

System overview, bus-connected components, Viggen

1.	Trionic T7, engine management system (430b, 589b)

2.	P bus (Powertrain bus)

3.	MIU (Main Instrument Unit) (540)

4.	I bus (Instrument bus)

5.	DICE (Dashboard Integrated Central Electronics) (628)

6.	SID (Saab Information Display) (541)

7.	Audio system, main unit (353)

8.	ACC, (Automatic Climate Control) (216)

9.	PSM, (Power Seat Memory), (357Dk)

10.	TWICE (Theft Warning &Integrated Central Electronics) (632)

11.	STC, (Soft Top Control), (565)

12.	CDC (CD changer) (355)

System overview, bus-connected components, other engine variants

1.	EDC 15, (Electronic Diesel Control) (595)

2.	Diesel pump (598)

3.	P bus (Powertrain bus)

4.	MIU (Main Instrument Unit) (540)

5.	I bus (Instrument bus)

6.	DICE (Dashboard Integrated Central Electronics) (628)

7.	SID (Saab Information Display) (541)

8.	Audio system, main unit (353)

9.	ACC, (Automatic Climate Control) (216)

10.	PSM, (Power Seat Memory), (357Dk)

11.	TWICE (Theft Warning &Integrated Central Electronics) (632)

12.	STC, (Soft Top Control), (565)

13.	CDC (CD changer) (355)

System overview, components connected to K lead

1.	DICE (Dashboard Integrated Central Electronics) (628)

2.	MIU (Main Instrument Unit) (540)

3.	Data link connector (H16-5/445)

4.	ABS (Anti-lock Brake System) (547)

5.	EDC 15, (Electronic Diesel Control) (595)

6.	Airbag (SRS) (331)

7.	DAH (Diesel Additional Heater) (597)

8.	TCM (Transmission Control Module) (502a)

9.	Trionic T5, engine management system (430a/589a)

10.	Motronic 2.10.3, engine management system (505)

System overview, brief description, Viggen

For M99 the Viggen is fitted with a B235R engine and the Trionic T7 engine management system. The Viggen's bus system will thus be almost identical to that in the 9-5.

Diesel cars have the same bus system as in M98 1/2 with EDC15 and the diesel pump connected to a bus.

Other petrol-engined variants have the M2.10 or Trionic T5 engine management system plus TCM on cars with automatic transmission.

The two powertrain systems EDC and diesel pump are not connected to the I bus, however. These systems require much faster communication to eliminate noticeable delays, 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). Communication on the P bus is ten times faster than on 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.

System overview, brief description, other models

The two powertrain systems EDC 15 and the diesel pump are not connected to the I bus. These systems require much faster communication so that there are no noticeable delays, when EDC requests a new fuel mass per injection or a new injection angle.

Therefore, they are connected to a separate bus called the P bus (Powertrain Bus). Communication on the P bus is ten times faster than on the I bus.

The P bus is also connected to MIU. The MIU is responsible for making the information that is available on one of the buses also available on the other. The other powertrain systems, Trionic, Motronic and TCM, as well as the auxiliary heater for diesel engines, are not connected to the bus. Note also that EDC 15 has a separate K lead to the diagnostic tool.

All the other bus systems communicate with the diagnostic tool via DICE, one of the I bus control modules.