ed800uk
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Hello everyone,
Gradually browsing through this great site, I read here about the Adario method.
Here's what I think is a similar tip -- it might be here already -- probably is.
If you have only a single current probe you can -- if the injection system uses low ohm injectors and an external resistor pack -- see "parade" traces by clamping the common feed wire. You get to see all injector currents on one trace. Fine.
But if you want to see injection in relation to another event, you need to identify each injector.
Sure you can use a second current clamp, or probe for injector voltage, or pick up an ignition event or a rotational sensor, but they all need a channel -- you might only have two -- and then you might have to search for a book to relate the injection event via the inlet opening time etc etc.
But how about if you clamp both the common feed, and the Injector #1 feed as well.
You get a trace like this GIF.
This shows the six cylinder injection parade with #1 at double amplitude due to the clamp seeing its current twice. (You have to run the wires in "opposite" directions, otherwise you'd see nothing for Inj #1) I know the firing order is 1, 4, 2, 5, 3, 6.
You can use the same technique to see (and identify) just a few cylinders, for example clamping on #2 and #5, to see whether the ECU controls each bank separately. In this case you don't have to run a wire through twice, because you know from the firing order that #2 opens just before #5. (see second GIF)
Regards to all, Ed
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