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Found this the other day looking for a solution to my erratically idling 1991 Volvo 740 and wanted to find more about relays, switches and Computer controlled ignitions....
http://members.rennlist.com/pbanders/ecu.htm
I'm not sure if it has been posted here but I'm sure it's useful!
This is taken from the first paragraph, "NOTE: This is a fairly technical document that has more information than many readers are looking for. If you would just like to understand a bit more about how the ECU works and some answers to the more common questions and problems, I'd suggest reading the first three sections, then moving on to the Common Questions and Answers section."
Anyways, if you're into electronics and voltages and technical data, it's a good read, may even be helpful.
-Krazy_Eskimo
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