Technical description 7
Technical description
Engine management system
General •••.•..•...••....•.••...•..•
7
Air induction system 4 cyl,
turbo engine -M1987 and i/S-M1988 .. 8
Air induction system 4 cyl,
turbo engine M1988- and i/S M1989- .. 9
Air induction system V6 M1995- ..... 1
O
Fuel system:
8202 .............................. 11
B234 .......................... . 12
Fuel pump assemblies:
Bosch ..••...•...•............•.... 13
Walbro, negative ejector •............ 13
Walbro, positive ejector ............•. 14
Engine management system
General
The Saab 9000 engine management systems usean
electric fuel pump to draw fuel from the fuel tank and
generate fuel pressure in the system. The pressure
level is determined by the pressure regulator, which
keeps fuel pressure constant in relation to the pres-
sure in the engine's air intake (4 cylinder engines
only). The quantity of fuel injected is therefore gov-
erned only by time the injector is open and not by
pressure variations in the intake manifold.
The fuel is injected by injectors (solenoid valves)
mounted in the intake manifold near the inlet valves
and connected to a common fuel rail.
Injector opening time is controlled by electrical con-
trol pulses from the control module.
For detailed description of the engine management
system, see the service manual for each system.
Components:
Fuel pump, Bosch ..•.•...•.•.•.•... 15
Fuel pump, Walbro negative ejector .•. 16
Fuel pump, Walbro positive ejector .... 17
Fuel filter ...•.......•.............. 18
Fuel rail ............•..........•... 18
Pressure regulator ...........•...... 19
Pulsator ................•.......... 19
Injectors ...................••....•. 20
Intake air temperature sensor ........ 20
Mass air flow sensor 4 cyl ...•.•...•. : 20
Mass air flow sensor V6 •...•.••....• 21
Air cleaner .........••.............. 21
Saab 9000
