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The MEG is fitted to all petrol cars with the EDG fitted to the diesels. Collectively, these are known as the ECU. The ECU is a solid state microprocessor board with the following key components inside:

The device functions are as follows:

  • SAM/ZEE connections link the ECU to the central electronics.
  • Engine connections link all the sensors to actuators within the engine.
  • The processor does exactly what it says - it processes all the inputs and gives different outputs.
  • The EEPROM contains the program to run the engine. It is this chip to which remaps are written to.
  • The capacitor supresses any voltage spikes from the alternator or battery to prevent damage to the ECU.

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