Ignition updates to the Unofficial FAQ

Jim Yanik wrote in news:Xns966B71542D3A0jyanikkuanet@129.250.170.84:

Then how do you explain this?

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a the text immediately below the title.

Then I'm still looking for a definitive answer.

Reply to
TeGGeR®
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----- Original Message ----- From: "TeGGeR®" Newsgroups: rec.autos.makers.honda,alt.autos.acura,alt.autos.honda Sent: Saturday, June 04, 2005 8:37 AM Subject: Re: Ignition updates to the Unofficial FAQ

That was how Jim got into the semantic trap to start with. The ECU supplies a low current ground to pin 4, which grounds an input on the IC, but the main ground - the one the coil current flows through - is the one shown in the lower right corner of the ignitor; the metal body of the ignitor itself. The current from pin 4 is undoubtedly in the range of 1 ma.

Mike

Reply to
Michael Pardee

"Michael Pardee" wrote in news: snipped-for-privacy@sedona.net:

Yes,the ECU signal is a normally HI,LO(ground)-to-enable signal.

Thanks!

Reply to
Jim Yanik

Yes, that is what I meant, and that is what the data sheet shows.

I did some more digging, and you are right, it is not an opto-coupler. It is indeed a chip for controlling ignition coils. It is made by Telefunken / TEMIC, and they had a family of 3: U2225B is used when the input is from an inductive sensor, U2226B is intended for use with a microcontroller / microprocessor and U2227B is used when the chip is connected directly to an optical sensor. I have not had any luck finding the data sheet for this part.

Reply to
Randolph

Jim Yanik wrote in news:Xns966B7FE54E0Fjyanikkuanet@129.250.170.84:

I've removed the innards of the igniter from the graphics and will add that body round later on, changing the yellow and orange lines around to suit.

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Since the workings are far more detailed than I had originally imagined, I will leave the igniter as a "here be dragons" blank box until somebody else decides to supply a correct schematic for me to copy.

Thanks very much to all.

Reply to
TeGGeR®

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