2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

s4 ecu pinout

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Old Oct 5, 2007 | 09:55 PM
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RX7 allnight's Avatar
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From: Santa Rosa Ca
s4 ecu pinout

someone had cut n spliced a little computer chip in what i beilive is my "3b"
pintout on the ecu.. its the farthest left connector and on that connector its all the way to the right on the bottom if you were looking at the ecu on the floor board.and is this the wire for the starter?
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Old Oct 5, 2007 | 09:57 PM
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btw this 1988 vert n/a
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Old Oct 5, 2007 | 10:38 PM
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as requested


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Old Oct 5, 2007 | 10:42 PM
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From: St. Thomas
where did you get that s4 pin out....if its in the shop manual in the faq could you send me a link....i looked through there for that
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Old Oct 5, 2007 | 10:47 PM
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The complete ECU pin-out is in the Fuel Systems chapter of the FSM.
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Old Oct 5, 2007 | 10:56 PM
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From: St. Thomas
THANKS!!!!....i've honestly been looking for that for the last 4 months and just gave up on it till i saw this post
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Old Oct 5, 2007 | 11:12 PM
  #7  
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From: Santa Rosa Ca
so why would someone cut in splice a "chip" into the starter line? ive never seen anything like it iall post pics
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Old Oct 5, 2007 | 11:21 PM
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From: Santa Rosa Ca


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Old Oct 5, 2007 | 11:38 PM
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is there any wires leading from the chip?, could be some kind of trickle charge or something for an old alarm.

The pinouts i posted are from alldata
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Old Oct 6, 2007 | 02:03 AM
  #10  
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no it just has one ground wire, and than its spliced into the 3B pin. which is the starter wire.
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Old Oct 6, 2007 | 02:12 AM
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thats weird, could you maybe get better quality pictures?
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Old Oct 6, 2007 | 01:49 PM
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From: St. Thomas
is the starter switch 3B pin the ignition switch???
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Old Oct 6, 2007 | 02:35 PM
  #13  
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From: Santa Rosa Ca
its a cpu chip wrapped in heat shrink i could get better quality pics if needed but it was hooked up to the 3b wire.. i cant get ahold of the guy who worked on the car before me
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Old Oct 6, 2007 | 07:08 PM
  #14  
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Originally Posted by RX7 allnight
so why would someone cut in splice a "chip" into the starter line? ive never seen anything like it iall post pics
Most likely a simple circuit to prevent flooding during hot starts. Disconnecting the start signal reduces the amount of fuel injected during cranking, which can prevent flooding.
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Old Oct 6, 2007 | 07:12 PM
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deleted
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Old Oct 6, 2007 | 07:17 PM
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Originally Posted by NZConvertible
Most likely a simple circuit to prevent flooding during hot starts. Disconnecting the start signal reduces the amount of fuel injected during cranking, which can prevent flooding.
yeah now that i think of it ,that might do it, good call imo
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Old Oct 6, 2007 | 08:27 PM
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From: ct
read article in dennis blackstones thread about the 3b wire and flooding his thread is (how many people have fixed flooding issues and what method worked )
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Old Jan 11, 2008 | 03:53 PM
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Does the oil pressure sendor go throught the ecu? If it does what pin is it? I've got a new autometer guage and I was wanting to use the factory wire instead of putting a new hole in the fire wall.
I guess I could just splice into the wire going to the dash....
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Old Jan 11, 2008 | 06:06 PM
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No, it does not go thru the ECU.
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