PRE-RELEASE
Brief description
| Brief description |
| Overview |
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Trionic T8 control module (589)
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Generator (2)
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Ignition switch (20)
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Switch, brake lights (29)
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Pressure monitor, engine oil (44)
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Level sensor, fuel (46)
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Fuel pump motor (323)
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Fuel pump relay (102)
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Main relay, engine management system (229)
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Secondary air injection pump relay (324)
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Oxygen sensor preheating relay (443)
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Main fuse box, petrol engine (727)
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Switch, clutch, cruise control (133)
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Switch, brakes, cruise control (134)
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Solenoid valve, charge air (179a)
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Coolant temperature sensor (202)
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Mass air flow sensor (205)
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Injector, cyl. 1-4 (206a-c)
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Level monitor, engine oil (243)
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Ignition coil with integrated power module, cyl. 1-4 (320a-c)
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EVAP canister purge valve (321)
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Secondary air injection pump motor (326)
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Relay, A/C compressor (156)
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Relay, start relay (517)
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Crankshaft position sensor (345)
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Accelerator position sensor (379)
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Manifold absolute pressure sensor (431)
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Diagnostic output, 16-pin, CARB (445)
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Pressure sensor, atmospheric pressure (539)
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EVAP pressure sensor (585)
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EVAP shut-off solenoid valve (588)
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Front heated oxygen sensor (592)
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Rear heated oxygen sensor (593
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Exhaust temperature sensor (602)
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Throttle body actuator (604)
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Wastegate valve (605)
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Pressure sensor, A/C (620)
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Intake manifold sensor (688)
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CIM (703)
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Power steering fluid pressure switch (739)
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CDM (740)
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Saab Trionic T8 has been developed by Saab and is a very advanced engine management system. ECM is used principally to regulate the air mass, fuel and ignition timing.
As the driver depresses the accelerator pedal, it acts on a pedal position sensor integrated in the pedal bracket.
This information in the form of a voltage is connected to ECM, which converts the voltage value to a torque request from the driver.
The torque request is then processed by ECM with regard to current operating conditions and limitations. The result is an air mass request to achieve the torque requested by the ECM. The driver's requested torque can be higher than that requested by ECM when, for example, maximum engine torque at the current operating point has already been attained, TCS modulation, knock control.
ECM regulates the throttle area (opening angle) together with the turbo (wastegate) so that the correct torque is attained, i.e. air mass per combustion.
This system has the following advantages:
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Turbocharger delay can be almost eliminated
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Exhaust emissions reduced during changes in load
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Idle speed control is integrated
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Load compensation is possible over the entire load and engine speed range
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Efficient engine torque limitation over the entire load and engine speed range
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Cruise control can easily be integrated in the system
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Fuel injection is sequential and regulated with air mass per combustion and engine speed as parameters.
Ignition takes place with individual ignition coils placed on the respective spark plug. The spark plugs together with the ignition coils and CDM are used to detect combustion and possible knocking.
This means there is no need for a camshaft position sensor or separate knock sensor.
Compared with the earlier Trionic T7, the following functions are new:
| Description |
Throttle body actuator (604)
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Contains throttle position sensor and throttle motor with associated reduction gear.
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The throttle body is spherical to improve the throttle area control with low loads.
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No mechanical limp-home function as with T7.
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Accelerator position sensor (379)
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Integrated in accelerator pedal bracket.
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Contains pedal position sensor
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Ignition coil with integrated power module (320)
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Separate inductive ignition coils with ionization current measurement.
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Power stage integrated in ignition coils
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CDM (740)
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Combustion Detection Module processes the ion current signal from the ignition coils first.
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Provides ECM with information on combustion quality and possible knocking.
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Exhaust temperature sensor (602)
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Measures temperature of exhaust gases after catalytic converter.
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Used as enable criteria for catalytic converter diagnosis.
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Pressure sensor, atmospheric pressure (539)
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New model located on engine instead of integrated in control module.
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Same function as in earlier Trionic T7 system.
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Power steering fluid pressure switch (739)
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Informs ECM when power steering servo pressure exceeds 17 bar.
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Used for idle speed compensation.
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Level monitor, engine oil (243)
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Informs ECM when oil level is low.
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Used for indication on SID.
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Level sensor, fuel (46)
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Informs ECM of current fuel level.
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Used for certain diagnoses and trip computer, and for indicating fuel level on MIU.
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Relay, start relay (517)
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Controlled by ECM.
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Radiator fan control
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Radiator fan logic is in ECM that also activates the radiator fan relays.
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Radiator fan can run in four different modes.
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Generator (2)
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ECM controls whether the generator should charge or not.
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Used to engage generator charging with a certain delay after starting and in certain cases disengage generator charging. In this case, the engine load will be reduced temporarily when idling to stabilise the idling speed.
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Pressure monitor, engine oil (44)
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Informs ECM when oil pressure is low.
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Used for indicating on MIU and SID.
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Pressure sensor, A/C (620)
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Informs ECM of current pressure on the A/C system high pressure side.
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Used for load compensating, radiator fan operation and is sent out as a bus message to be used by ACC.
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