9-5 Sport Wagon (9600) V6-3.0L Turbo (B308) (2003)
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Engine Control Module: Description and Operation
Trionic
Control Module
Saab Trionic T7 control principally:
-
engine torque
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fuel injection
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ignition.
The control module for Trionic T7 has a 70-pin connector and is placed in the engine bay in front of the windscreen on the passenger side.
It has two processors. A number of sensors supply information to the control module, which processes it with the help of matrices stored in the control
module after optimization of engine functions. Examples of these important matrices are the ignition timing matrices, fuel matrices and air mass matrices.
The control module can be damaged by electrostatic discharges or short-circuiting of any of its outputs. Great care must therefore be taken when
handling the control module, such as when carrying out fault diagnosis with BOB.
The control module is continuously supplied with +30 and will lose adapted values and stored diagnostic trouble codes if this current disappears.
The control module is adapted for a voltage of between 8-16 V when being driven.
When the ignition is switched on, the control module will be activated and the CHECK ENGINE lamp will go on continuously as a function check. The
fuel pump is activated for 1 second so that fuel pressure will build up, after which the control module will await pulses from the crankshaft position
sensor.
Fuel injection is controlled principally by the mass air flow sensor.
Substitute functions are available for all the sensors except the crankshaft position sensor.
An absolute pressure sensor for atmospheric pressure is integrated in the control module.
Atmospheric pressure is used to:
