EFI signal test box

The invention discloses an EFI (electronic fuel injection) signal test box. The EFI signal test box comprises a signal test box and a data line. One end of the signal test box is connected to an ECU control unit, and the other end thereof is connected to a sensor and an actuator through a wire harness. The signal test box is internally provided with circuits having the same quantity as ECU outputsand inputs and the power signals, each circuit is provided with a signal input jack, a signal control switch and a signal pick-up jack, and the signal input jacks and the signal pick-up jacks are connected with a test instrument or a signal generator through the data line. The signal test box is connected in series between the ECU control unit and the wire harness, the signal test box is providedwith input and output jacks of each path of signals and corresponding switches, the jacks on the test box are connected with the test instruments or the signal generators through the special data lines to achieve rapid extrac