Omega B
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Function
The function of the Motronic M 2.8.1 corresponds on the whole to Motronic M 2.8 in the C 25 XE engine for the Vectra / Cavalier / Calibra. New features are the MULTI - RAM system (intake manifold switch - over), derived from the DUAL - RAM system in the 0 26 NE / C 30 SE, the stereo oxygen sensor control, the EGR system with response, the secondary air system and Traction Control (TC).
In addition, the function of the previous fuel pump relay has been assumed by two single relays. Further, version coding via TECH 1 is possible for the first time.
In contrast to the DUAL - RAM system, the MULTI - RAM system uses two valves to adapt the intake manifold length instead of one.
This ensures high torque over a wide engine speed range and increases the engine output.
The stereo oxygen sensor control uses two separate oxygen sensors for the right and left cylinder banks, achieving ideal carburetion for each.
In the EGR system, a defined amount of exhaust gas is returned to the combustion process to reduce the formation of nitrogen oxides (NOx).
Under certain conditions, an electric fan (installed in the wheel housing) injects fresh air into the exhaust valves in the cylinder head. This increases the combustion of hydrocarbons. In addition, it increases the exhaust temperature, leading to a faster catalytic converter reaction.
The previously familiar dual relay (fuel pump relay), which supplied the fuel pump and the injectors with voltage, is no longer used. Its function is taken over by two relays, the fuel pump relay and the injection system relay. The two relays are identical in design and appearance and can be used interchangeably. They are located in the engine compartment relay frame.
When the ignition is switched off, data (such as calculated values / learned values, MT or AT transmission, trouble codes, version codes) is now stored in an EEPROM and not in a battery - buffered RAM.
Advantages:
Guaranteed storage of data, even when battery voltage is disconnected. Previous MT / AT and version coding plugs are not required.
Codes can be deleted (on replacement of the control unit) by reinitializing the EEPROM with TECH 1.
TECH 1 can be used to increase the idle speed in three steps of 50 rpm each (version coding).
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