|
|
PFI VIN [3]. It is a perfect example of the peak and hold theory. The waveform shows a 1-amp per division current flow, ramping to 4 amps and then decreasing to 1-amp to hold the injector open. Fig. 13: Injector Bank w/Normal Current Flow - Current Pattern EXAMPLE #6 - CURRENT CONTROLLED DRIVER This next known-good waveform is from a Ford 5.0L V8 CFI VIN [F]. See Fig. 14. The pattern, which is set on a 250 milliamps scale, indicates a 1.25 amp peak draw and a hold at 350 milliamps. Fig. 14: Single Injector w/Normal Current Flow - Current Pattern EXAMPLE #7 - CURRENT CONTROLLED DRIVER The known-good current controlled type waveform in Fig. 15 is from a GM 2.0L TBI VIN [1]. With the lab scope set at 2 amps per division, notice that this system peaks at 4 amps and holds at 1 amp. The next waveform is from the same type of engine, except |