Electrical A9L Schematic

M

Mrg2783

5 Year Member

Apr 1, 2018

89

7

8

Newport Beach

Jul 29, 2025

#1

• Jul 29, 2025

• #1

I have a 1992 GT Convertible that has a A9M

But a A9L works fine, does anyone have an A9L Schematic? Any schematics at least to help me figure out the Orange diodes.

I need to replace what appear to be bad zener diodes. Does anyone have information on what these diodes are rated at? It looks like some have a white blue line and someone have a white green line.

The repair shop wants a schematic to make sure they are replacing them correctly

 

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91AOD5.0LX

I have a slight sag in my rear

5 Year Member

Feb 20, 2021

1,026

941

133

Lake George NY

Jul 29, 2025

#2

• Jul 29, 2025

• #2

This may be another option for you. No worries about finding schematics and hoping the repair place does it correctly.
Send it to ECU Exchange and get it back in perfect working order without having to provide any information. Many of us used this business and they have always done a great job to my knowledge including for myself.

Home - ECU Exchange

ECU Exchange specializes in the re-manufacturing and repair of engine control modules.

www.theecuexchange.com

 

Reactions: evintho, General karthief, Mrg2783 and 1 other person

AeroCoupe

lube between the nut and the face. I know my lubes

Founding Member

Oct 28, 2001

5,782

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183

Claremore, OK

Jul 30, 2025

#3

• Jul 30, 2025

• #3

If the repair shop doesn’t know what they are go get your ECU and send it to ECU Exchange. They have repaired a lot of the ones here for members and have an excellent reputation and typically find a lot more wrong with them than you would think. They are going on 30+ years old and several of the components are just aging out.

 

Reactions: General karthief and Mrg2783

M

Mrg2783

5 Year Member

Apr 1, 2018

89

7

8

Newport Beach

Jul 30, 2025

#4

• Jul 30, 2025

• #4

AeroCoupe said:

If the repair shop doesn’t know what they are go get your ECU and send it to ECU Exchange. They have repaired a lot of the ones here for members and have an excellent reputation and typically find a lot more wrong with them than you would think. They are going on 30+ years old and several of the components are just aging out.

Click to expand...

I was not aware that if it’s not repairable, they will send it back to you. Free of charge. That’s actually pretty awesome. My biggest thing was dropping a couple hundred dollars versus spending the extra thousand and getting a terminator set up but I’ve already done so much for this thing. Would be a waste of a Pro-M 80 mass air filter if I didn’t get this thing running right

Appreciate the direction I’ll be sending it to them. But it still wouldn’t hurt if somebody comes out with an A9L schematic for people. Unfortunately, a lot of people don’t have the money to throw away on something like that. If they have the schematic, they could potentially do a lot of the work themselves.

 

M

Mrg2783

5 Year Member

Apr 1, 2018

89

7

8

Newport Beach

Jul 30, 2025

#5

• Jul 30, 2025

• #5

Sailorbob on eectuning.org came through with the schematic. At least it’s here now for the Foxbody world to see.

 

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Reactions: rednotch

gkomo

now i can hopefully expect to receive the shaft

Aug 2, 2024

2,122

1,365

133

San Diego, CA

Jul 30, 2025

#6

• Jul 30, 2025

• #6

While I understand money is money, i wouldn't consider ECUExchange 'throwing away money'. Having a solid/working ECU will help remove potential hard to diagnose issues.

 

Reactions: AeroCoupe and 91AOD5.0LX

Mustang5L5

That is…until I whipped out my Bissell

Mod Dude

Feb 18, 2001

43,164

17,860

224

Massachusetts

Jul 31, 2025

#7

• Jul 31, 2025

• #7

Awesome to get the schematic. Wish it was a tad bit sharper

 

Reactions: Shakerhood