Waveforms - Injector Pattern Tutorial

W AVEFORMS - INJECTOR PATTERN TUTORIAL 1995 Volvo 850 GENERAL INFORMATIONWaveforms - Injector Pattern Tutorial * PLEASE READ THIS FIRST *NOTE: This article is intended for general information purposes only. This information may not apply to all makes and models. PURPOSE OF THIS ARTICLE Learning how to interpret injector drive patterns from a LabScope can be like learning ignition patterns all over again. Thisarticle exists to ease you into becoming a skilled injector patterninterpreter. 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 differenttypes of systems are covered here, regardless of the specificyear/make/model/engine. The reason for such broad coverage is because there are onlya few basic ways to operate a solenoid-type injector. By understandingthe fundamental principles, you will understand all the major pointsof injector patterns you encounter. Of course there are minordifferences in ...