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Electronic Control Unit (ECU)

 Electronic Control Unit (ECU)

  • An ECU is assigned to a pair of engine cylinders.  The ECUs control the fuel mixture and spark timing for their respective engine cylinders; ECU 1 controls opposing cylinders 1 and 2, ECU 2 controls cylinders 3 and 4, and ECU 3 controls cylinders 5 and 6. 
  • Each ECU is divided into upper and lower portions. The lower portion contains an electronic circuit board, while the upper portion houses the ignition coils.
  •  Each electronic control board contains two independent microprocessor controllers that serve as control channels. During engine operation, one control channel is assigned to operate a single-engine cylinder. Therefore, one ECU can control two engine cylinders, one control channel per cylinder.
  • The control channels are independent, and there are no shared electronic components within one ECU. They also operate on independent and separate power supplies. 
  • However, if one control channel fails the other control channel in the pair within the same ECU is capable of operating both its assigned cylinder and the other opposing engine cylinder as backup control for fuel injection and ignition timing.

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