Buick Encore: Purpose of this article
NOTE: This is GENERAL information. This article is not intended to
be specific to any
unique situation or individual vehicle configuration. For model-specific
information see appropriate articles where available.
Purpose of this article
NOTE: This is GENERAL information. This article is not
intended to be specific to any
unique situation or individual vehicle configuration. For model-specific
information see appropriate articles where available.
Learning how to interpret injector drive patterns from a Lab Scope can be
like learning ignition patterns all over
again. This article exists to ease you into becoming a skilled injector pattern
interpreter.
You will learn:
- How a DVOM and noid light fall short of a lab scope.
- The two types of injector driver circuits, voltage controlled & current
controlled.
- The two ways injector circuits can be wired, constant ground/switched
power & constant power/switched
ground.
- The two different pattern types you can use to diagnose with, voltage &
current.
- All the valuable details injector patterns can reveal.
SCOPE OF THIS ARTICLE
This is NOT a manufacturer specific article. All different types of systems
are covered here, regardless of the
specific year/make/model/engine.
The reason for such broad coverage is because there are only a few basic ways to
operate a solenoid-type
injector. By understanding the fundamental principles, you will understand all
the major points of injector
patterns you encounter. Of course there are minor differences in each specific
system, but that is where a
waveform library helps out.
If this is confusing, consider a secondary ignition pattern. Even though there
are many different
implementations, each still has a primary voltage turn-on, firing line, spark
line, etc.
If specific waveforms are available in On Demand for the engine and vehicle you
are working on, you will find
them in the Engine Performance section under the Engine Performance category.
READ NEXT:
Use the Right Noid Light
INTRODUCTION
You probably have several tools at your disposal to diagnose injector
circuits. But you might have questioned
"Is a lab scope necessary to do a thorough job, or
NOTE: This is GENERAL information. This article is not intended to
be specific to any
unique situation or individual vehicle configuration. For model-specific
information see appropriate articles whe
NOTE: This is GENERAL information. This article is not
intended to be specific to any
unique situation or individual vehicle configuration. For model-specific
information see appropriate articles wh
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Warning
If a floor mat is the wrong size or
is not properly installed, it can
interfere with the pedals.
Interference with the pedals can
cause unintended acceleration
and/or increased stopping
distance which can cause a crash
and injury. Make sure the floor
mat does not interfere with the
pedals.
Support the vehicle drive axle on a suitable hoist. Refer to Lifting and
Jacking the Vehicle .
Remove the tire and wheel assemblies from the drive axle. Refer to Tire
and Wheel Removal and
Installation .
Reinstall the wheel nuts in order to retain the brake rotors.
Run the vehicle at the c