Mitsubishi Montero (1991+). Manual — part 323

Fig. 19: Injector Bank - Known Good - Voltage Pattern

EXAMPLE #2 - VOLTAGE CONTROLLED DRIVER

The known-good waveform pattern in Fig. 20 is from a GM 3.8L

V6 PFI VIN [3]. It was taken during hot idle, closed loop and no load.

Fig. 20: Injector Bank - Known Good - Voltage Pattern

EXAMPLE #3 - VOLTAGE CONTROLLED DRIVER

This known-good waveform pattern, Fig. 21, is from a GM 5.0L

V8 TPI VIN [F]. It was taken during hot idle, closed loop and no load.

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.