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Old 05-12-2008, 11:29 AM   #61
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"but quite complicated for an electrical novice like myself"

I'm getting helpful info from a simple DMM. At Harbor Freight they start at $4. That would be enough to monitor mixture (lean burn). I paid more ($33) for a meter with a dwell-angle feature. That lets me monitor how long my injectors are open, which is a direct measure of true, instantaneous fuel consumption.

It's not hard to do. I'd be glad to explain how to do it.

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Old 05-13-2008, 03:00 PM   #62
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I just looked at the 96 - 98 Civic Helm shop manual. It seems that instead of a test harness to connect to the ECU, back probe pin adapters are used on a standard DMM to connect to the pin outs on the ECU.

Has anyone tried this? It looks like it would work to access D14 and D16.

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Old 05-13-2008, 04:10 PM   #63
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"Has anyone tried this?"

I think some kind of back probe would work fine. Like this:


Or this:


But I wanted something cheaper, that I could find locally. Radio Shack had the perfect thing:


Too bad there's no picture. These are called Quick Splice Connectors or T-Tap Connectors. Some more:




Each approach has its own advantages. The RS product worked great for me, for this exact purpose (tapping wires near the ECU).

I tapped D14 and D16, to monitor AFR. I also tapped A1, to monitor the injectors (this requires a DMM with dwell, but I found one for only $33). This is very helpful, because it gives me a precise indication of instantaneous fuel use.

I also tapped D18, because my car has no SIL (shift indicator light), and I was curious what it would be like to have one.

There are some other interesting things to tap, but so far I haven't bothered.

I've also become very interested in the possibility of using a cheap ($25-50) data-acquisition interface to display/capture all this data on a laptop, instead of a DMM. I think that creates all sorts of interesting possibilities, greatly exceeding what a Scangauge can do. I wonder if anyone here has any thoughts about this idea.

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