Honda HR-V: 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.
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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 will a set of noid lights
A DVOM is typically used to check injector resistance and available voltage
at the injector. Some techs also use
it check injector on-time either with a built-in feature or by using the
dwell/duty f
SEE MORE:
Special Tools Required
SRS Short Canceller 070AZ-SAA0100
NOTE:
Before doing this troubleshooting procedure, find out if the vehicle was
in a collision. If so, verify
that all the required components were replaced with new components of the
correct part number,
and that they were properly ins
Removal
1. Vehicle - Lift
2. No. 2 Propeller Shaft - Disconnect
3. Rear Differential - Support
4. Rear Differential Front Mount - Remove
Remove the rear differential front mount bracket (A).
Remove the rear differential front mount (A).
5. Rear Differential Rear Mount - Remove
Remove the