| 摘要 |
An engine comprising a fuel injector, an oxygen concentration detector and an electronic control unit. In the electronic control unit, a basic fuel injection time period is calculated, and a correction valve of the basic fuel injection time period is calculated on the basis of the output signal of the oxygen concentration detector. The electronic control unit comprises a back-up RAM storing the mean value of the correction value therein, and an output outputting a voltage which corresponds to the correction value. A connector device is provided, which comprises a connector body and a cap removably fitted onto the connector body. The connector body comprises a output terminal connected to the output of the electronic control unit, a power input terminal connected to the back-up RAM, and a power supply terminal connected to a battery. The cap has a U-shaped connecting terminal which comes into contact with the power input terminal and the power supply terminal for applying an electric power to the back-up RAM when the cap is fitted onto the connector body.
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