AFI ECM toast?

T

Tincture77

Member
I just recently finished installing the kit from afi on my '73 t'all 392 2wd. I finally figured out the software for data logging (com port set up issues),but as I set out to log data from a cold start, no dice. The check engine light did not illuminate, nor did the fuel pump turn on for a few seconds. I followed the troubleshooting guide and checked the fuel pump relay, and its ok. Also checked the check engine light and its ok. Also all the fuses are good. Is ECM failure common? Do I have to buy a new one, and if so can I use the chip that they "customized" for my application. I tried calling their (afi)tech support and left a call back #. I also emailed them but still silence after a week. Any ideas?
 
Can you elaborate a little on the data logging?
Was the winaldl working and flashing a 20 in green at the top?

Then when you went to drive it, it didn't work?
But at the same time you didn't have the fuel pump turn on?

Use the file I attached and hopefully you have a meter. Perform the keyon voltage checks and post up the results.
If any are out of spec then look deeper.
 

Attachments

  • voltagechecks.xls
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I had been driving it for a few days, everything was working fine except for an intermittent miss while driving at steady speeds. The aldl cable was working and the winaldl program was collecting data. The tb is getting fuel but only because I'm using the mechanical fuel pump as a scavenger pump before the one supplied in the kit. I'll go through your voltage check this evening and post results.
 
So the system was up and running and driving and you just shut it off one night and went to start it the next day and it would not start.
No work done on anything from the time you shut it off until you went to start it the next time.
 
Yep. The only change I made to the truck during the brief "operational" period was replacing the alternator. But it was driving after the alternator was replaced. The only other thing I can think of was that I disconnected the battery and took it out while replacing the a/c compressor earlier the day it quit working. The inline fuse on the red power line from the + battery terminal isn't blown.
 
Ok here we go. The only circuits that had voltage were a5 @12.34, b1 @ 11, and c16 @ 10. The battery is fully charged. There were some differences from your spreadsheet; a4,a7,a10,b7,c2, and c7 were all blank.
 
It helps if you just fill out the spreadsheet and post it as an attachment.

So based on what you measured, what voltage is missing that you didn't list that would cause the problem?

Hint, the system needs 12v from the battery and 12v from the key to operate when the key is turned on.
 
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