Mitsubishi Montero (1998+). Manual - part 364

Fig. 21:  Injector Bank - Known Good - Voltage Pattern

         EXAMPLE #4 - CURRENT CONTROLLED DRIVER

         From 1984 to 1987, Chrysler used this type injector drive on

their TBI-equipped engines. See Fig. 22 for a known-good pattern.

Instead of the ground side controlling the injector, Chrysler

permanently grounds out the injector and switches the power feed side.

Most systems do not work this way.

         These injectors peak at 6 amps of current flow and hold at 1

amp.

Fig. 22:  Single Injector - Known Good - Voltage Pattern

         EXAMPLE #5 - CURRENT CONTROLLED DRIVER

         These two known-good waveform patterns are from a Chrysler 3.

0L V6 VIN [3].  The first waveform, Fig. 23, is a dual trace pattern

that illustrates how Chrysler uses the rising edge of the engine speed

signal to trigger the injectors. The second waveform,  Fig. 24, was

taken during hot idle, closed loop, and no load.

Fig. 23:  Injector Bank - Known Good - Voltage Pattern

Fig. 24:  Injector Bank - Known Good - Voltage Pattern

         EXAMPLE #6 - CURRENT CONTROLLED DRIVER

         This known-good pattern from a Ford 3.0L V6 PFI VIN [U]

illustrates that a zener diode inside the computer is used to clamp

the injector’s inductive kick to 35-volts on this system. See  Fig. 25.