Patent ID: 7367321

Claim:
A method of detecting an erroneous connection between a plurality of ignition devices and a fuel injection control apparatus, the method being executed by the fuel injection control apparatus of a type which is provided in a multiple cylinder engine having different interval times between respectively successive ignition timings for cylinders, and outputs fuel injection signals to injectors of the respective cylinders by receiving ignition signals, via respective lines, from the ignition devices outputting ignition signals to predetermined cylinders and utilizing the ignition signals as reference timings for fuel injection timings, the method comprising the steps of: measuring a first interval time from an input of an ignition signal for a certain cylinder to an input of the next ignition signal, and a second interval time from an input of the next ignition signal to an input of a further next ignition signal; determining whether or not an erroneous connection exists, by comparing a relation between the first interval time and the second interval time with a previously stored normal relation between the first interval time and the second interval time in the case that the lines are correctly connected in accordance with a predetermined procedure; and outputting and displaying the erroneous connection to a predetermined erroneous connection display means if it is determined that the erroneous connection exists.