Luis, A current probe on the Vbatt feed to your injectors would allow you to moni= tor all injectors. Upstream of the wire harness splice or a "Fuse Buddy" in= stalled in the distribution block. Delayed sweep, to zoom, on a particular = injector current waveform. Measuring control voltage, a "T-Pin" makes it ea= sy to back probe a weather tight connector without damaging the seal or pin= ..=20 I'm assuming you work mostly with High Impedance injectors?=20 T-Pin http://content.etilize.com/900/11960698.jpg Fuse Buddy http://www.esitest.com/img/307M-308B.jpg -MK -----Original Message----- From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of= Luis Moreira Sent: Monday, March 02, 2015 10:51 AM To: Microcontroller discussion list - Public. Subject: RE: [EE] Injector Testing Hi Guys, Thanks for getting me in the right direction. There's more to the injector = signals than at first tought... and like James said there is a lot of info = in the current waveform. The breakout box will be useful but not the way I was thinking in the begin= ning, it will be convenient in some cases to get all the injector signals a= ccessible as getting to the connectors is a pain. thanks Luis On 1 Mar 2015 22:13, "Luis Moreira" wrote= : > Hi James, > Do you have any links that show what you mean? When you talk of rise=20 > time is that at switch on? And peak current the same? > There are LEM products that measure DC, I use them all the time at my=20 > current job. > Best Regards > Luis > On 28 Feb 2015 17:56, "James Holland" wrote: > >> > From: Luis Moreira >> > Subject: RE: [EE] Injector Testing >> >> > Hi James, >> > Not quite the question I was asking, I have access to plenty of=20 >> > tools >> like >> > that one at the moment. In fact I use one like that from fluke all=20 >> > the time, I also have some tektronix ones. >> > I am more interested on the manner of the testing. >> > I deal mostly with 4 cylinder vehicles and although I intend to=20 >> > expand >> this >> > test setup to 6,8 or even 12 cylinders, this is ideal to get the=20 >> > measurements into a four channel scope, which will show the four >> injector >> > signals and timing in relation to each other. In my opinion in one=20 >> > go I could get quite a lot of info just from this. The breakout box=20 >> > would >> allow >> > me to observe the injector signals with them still connected to the ec= u. >> > Observing the current would also give me info on injector=20 >> > resistance and any other issues. >> > As an example, I am looking at a Vauxhall Vivaro, which had a=20 >> > confirmed faulty injector changed. After they changed it, the=20 >> > problem is still >> there >> > and instead of a cylinder X miss fire I get a intermitent injector >> control >> > short circuit fault. I suspect the bad injector may have damaged=20 >> > the ECU output driver stage/current sensing circuit, but before I=20 >> > send the ECU >> for >> > repair I need to reassure myself that the rest of the circuit=20 >> > (wiring,connectors and injectors) are fine under load, Now getting=20 >> > to >> the >> > injectors on a van like this is a pain and I only want to remove=20 >> > all the bits to get to them a couple of times. With a breakout box=20 >> > I would get >> all >> > the info at once. >> > As I haven't found any setup like this I am just wandering if this=20 >> > as >> worth >> > while thing to persue. >> > Thank you. >> > Luis >> > On 27 Feb 2015 18:10, "James Holland" wrote: >> > >> >> The breakout box is a good idea but I don't see a big advantage of=20 >> having multiple current probes. It should be pretty easy to spot a=20 >> bad injector from its current waveform if its an electrical failure=20 >> rather than a blockage; the peak current and the rise time tell you all = you need to know. >> The LEM sensors that I've looked at measure AC current only, if you=20 >> do decide to build a setup then sensors that can measure the DC=20 >> component as well would give a better representation of the waveform. >> James >> >> -- >> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive=20 >> View/change your membership options at=20 >> http://mailman.mit.edu/mailman/listinfo/piclist >> > -- http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/chang= e your membership options at http://mailman.mit.edu/mailman/listinfo/piclis= t --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .