Example #8 - Current Controlled Driver

These two known-good waveform patterns are from a GM 2.0L In-Line 4 VIN [1]. Fig. Fig 1 illustrates the 78 volt inductive spike that indicates a zener diode is not used. The second waveform, Fig. Fig 2, was taken during hot idle, closed loop, and no load.

Fig 1: Single Injector - Known Good - Voltage Pattern

Fig 2: Single Injector - Known Good - Voltage Pattern