Hummer H2. Manual - part 163

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

EXAMPLE #2 - VOLTAGE CONTROLLED DRIVER 

The known-good waveform pattern in Fig. Fig. 20 is from a GM 3.8L V6 PFI VIN [3]. It was taken during hot 
idle, closed loop and no load.  

 

1998 Chevrolet Pickup C1500 

GENERAL INFORMATION Waveforms - Injector Pattern Tutorial

  

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

EXAMPLE #3 - VOLTAGE CONTROLLED DRIVER 

This known-good waveform pattern, Fig. Fig. 21 , is from a GM 5.0L V8 TPI VIN [F]. It was taken during hot 
idle, closed loop and no load.  

 

1998 Chevrolet Pickup C1500 

GENERAL INFORMATION Waveforms - Injector Pattern Tutorial

  

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. 

 

1998 Chevrolet Pickup C1500 

GENERAL INFORMATION Waveforms - Injector Pattern Tutorial

  

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. 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. Fig. 24 , was taken during hot idle, closed loop, and no load. 

 

1998 Chevrolet Pickup C1500 

GENERAL INFORMATION Waveforms - Injector Pattern Tutorial