9-3 (9440) L4-2.0L Turbo (2.0 T) (2006)
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Engine Control Module: Description and Operation
Control module, Trionic 4-cyl. Petrol (589)
Location
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Trionic control module, 4-cyl petrol, connector A (589A)
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Trionic control module, 4-cyl petrol, connector B (589B)
Main use
Trionic T8 mainly regulates:
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Engine torque
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Fuel injection
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Ignition timing
The control module has two processors. A number of sensors send information to the control module, which processes it using matrices stored in its
memory after optimising the function of the engine. Examples of these essential matrices are the timing matrices, fuel matrices and air mass matrices.
A control module can be damaged by electrostatic charges or if one of its outputs is short circuited and consequently, great care must be taken when
handling control modules during fault diagnosis with BOB, for example.
Fuel injection is primarily controlled with the assistance of the mass air flow sensor. There are substitute functions for all the sensors, except the
crankshaft position sensor, should a fault occur.
The atmospheric pressure is used to:
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Correct the charge air control valve PWM ratio. A greater PWM ratio is needed to attain the same air mass/combustion at low atmospheric
pressures.
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Correct the PWM ratio of the ventilation system. A greater PWM ratio is needed to attain the same ventilation flow at low atmospheric pressures.
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Protect the turbocharger from overrevving at low atmospheric pressures by limiting the maximum permitted air mass per combustion.
Power supply, ground and bus communication
