The thing is that Diesels represent a significant percentage of our current work load & as such it makes sense to prepare to tackle them adequately.
One of the greatest skills that a technician should possess, is the ability (and willingness) to recognise & accept when there is a gap in his or her understanding & then take steps to address those gaps!
My initial thoughts when I read Ray's first post were....
In the absence of any previous knowledge of this system, how can I test these injectors & what voltage & amperage should I expect to see?
Perhaps I could study the voltage & current signatures from each of the four injectors & maybe I can spot an "odd one out" & in doing so, I might gain some understanding about how they operate.
This method has served me well & I often use it when I presented with an unfamiliar system.
For example, how often are we presented with an ABS system fault & we wonder about how best to test a wheel speed sensor. Is it a magnetoresistive, inductive or some other form of active type sensor? In the same way that Ray has questions, so do I.
It isn't very often that we won't have three other good examples available for our educational & research needs.
With an inquisitive mind & an understanding of oscilloscope use, it is possible to learn an enormous amount about the mysteries of modern electronically controlled systems.
Cheers all
Dave
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