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1985-1986 L4 ECM Pin Out by Romsk
Started on: 06-20-2025 09:00 AM
Replies: 4 (49 views)
Last post by: fierosound on 06-22-2025 11:39 AM
Romsk
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Report this Post06-20-2025 09:00 AM Click Here to See the Profile for RomskClick Here to visit Romsk's HomePageSend a Private Message to RomskEdit/Delete MessageReply w/QuoteDirect Link to This Post
All,

Every drawing I find on the Fiero L4 1985-86 ECM pin out is so poor quality, I can't tell which pin numbers are which in some cases.

Can anyone tell me which pins are these signals on? (see link below to see what is hard to read)

Poor Quality Image


What pin is the SHIFT LIGHT signal?

What pin is the FUEL PUMP RELAY DRIVE signal?

What pin is the 2nd +12V BATTERY signal?

What pin is the PARK NEUTRAL SWITCH signal?

What pin is the +12V IGNITION signal?


Maybe someone has a list of signals for this ECM, or a better scan of the diagram?

Thanks
Paul

[This message has been edited by Romsk (edited 06-20-2025).]

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fierosound
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Report this Post06-20-2025 09:23 AM Click Here to See the Profile for fierosoundClick Here to visit fierosound's HomePageSend a Private Message to fierosoundEdit/Delete MessageReply w/QuoteDirect Link to This Post
From 1986 Service Manual https://fieroinfo.com/
(copy/paste image into Paint will give a bigger picture)




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[This message has been edited by fierosound (edited 06-20-2025).]

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Romsk
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Report this Post06-20-2025 07:12 PM Click Here to See the Profile for RomskClick Here to visit Romsk's HomePageSend a Private Message to RomskEdit/Delete MessageReply w/QuoteDirect Link to This Post
Excellent images! Thanks!
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Romsk
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Report this Post06-20-2025 07:18 PM Click Here to See the Profile for RomskClick Here to visit Romsk's HomePageSend a Private Message to RomskEdit/Delete MessageReply w/QuoteDirect Link to This Post

Romsk

165 posts
Member since Jul 2022
On the white connector, they show pin 19 twice. One for automatic transmission and one for manual.

IMHO, that is an odd way to show an option - go figure it's GM. I would show pin 19 once and then dotted lines to each optional circuitry.

As I squinted with the poor image I had, it did look like pin 19 was shown twice, but I didn't even look for the clue of the external circuitry... I was so focused on determining the pin numbers. Having a clear image puts everything in perspective and no guess work. I copied the clear images you my PC.

Thanks again.
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fierosound
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Report this Post06-22-2025 11:39 AM Click Here to See the Profile for fierosoundClick Here to visit fierosound's HomePageSend a Private Message to fierosoundEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by Romsk:

I copied the clear images you my PC.

Thanks again.



Glad it helped.
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