Current Controlled Injector Waveform Pattern - 1987 Ford LTD Crown Victoria

This document is a single page from Mitchell Repair Information Company's "Waveforms - Injector Pattern Tutorial," showing Fig. 3: "Identifying Current Controlled Type Injector Pattern," captured on a 1987 Ford LTD Crown Victoria. The page consists of an oscilloscope screen capture of a fuel injector voltage waveform recorded on Channel 1 at 5 volts per division with a 1 millisecond per division timebase. Seven callout letters (A through G) mark the key features of a current controlled (peak-and-hold) injector pattern: the flat baseline supply voltage (A), the voltage drop when the injector driver turns on (B), the low on-voltage (C), the rise into the first voltage spike (D), the intermediate current-limiting hold voltage level (E), the second inductive voltage spike at injector turn-off (F), and the decaying tail of that spike as voltage returns to baseline (G). The figure carries reference number 95C23863 and a 2003 Mitchell Repair copyright, printed February 13, 2004. The page itself contains no explanatory text defining the letters; it is the illustration page of a multi-page tutorial (companion pages in the same set cover voltage controlled patterns, injector driver types, and injector bank current flow). It helps technicians visually recognize the two-spike signature of a current controlled injector driver on a lab scope.