7749 communications trouble (need help)
Thread Starter
Melting Slicks
Joined: Oct 2000
Posts: 2,158
Likes: 9
From: N.E. WA
7749 communications trouble (need help)
Quick overview. 91 covette with a 7749 wired in (correctly?) using the 91 memcal and the $58 mask. Diacom/pocket programmer/TunerCat
I can't communicate with the ecm with the $58 mask. If I use my stock memcal and chip, I can. I am getting a SYS that flashes 3 times and then goes back to the fuel information. 20 seconds later, SYS flashes 3 times again. Right now I am using a 27SF512 chip. I believe the $58 mask is 16k, so I offset my chip and start it at 0C000. To help troubleshoot, I burned a stock 91 program onto the same chip, used the adapter, and I could communicate with that as well. Any suggestions would be welcomed at this point.
I can't communicate with the ecm with the $58 mask. If I use my stock memcal and chip, I can. I am getting a SYS that flashes 3 times and then goes back to the fuel information. 20 seconds later, SYS flashes 3 times again. Right now I am using a 27SF512 chip. I believe the $58 mask is 16k, so I offset my chip and start it at 0C000. To help troubleshoot, I burned a stock 91 program onto the same chip, used the adapter, and I could communicate with that as well. Any suggestions would be welcomed at this point.
Le Mans Master
Joined: Jan 2003
Posts: 8,596
Likes: 19
From: Portland Oregon
Originally Posted by ANTI VENOM
Quick overview. 91 covette with a 7749 wired in (correctly?) using the 91 memcal and the $58 mask. Diacom/pocket programmer/TunerCat
I can't communicate with the ecm with the $58 mask. If I use my stock memcal and chip, I can. I am getting a SYS that flashes 3 times and then goes back to the fuel information. 20 seconds later, SYS flashes 3 times again. Right now I am using a 27SF512 chip. I believe the $58 mask is 16k, so I offset my chip and start it at 0C000. To help troubleshoot, I burned a stock 91 program onto the same chip, used the adapter, and I could communicate with that as well. Any suggestions would be welcomed at this point.
I can't communicate with the ecm with the $58 mask. If I use my stock memcal and chip, I can. I am getting a SYS that flashes 3 times and then goes back to the fuel information. 20 seconds later, SYS flashes 3 times again. Right now I am using a 27SF512 chip. I believe the $58 mask is 16k, so I offset my chip and start it at 0C000. To help troubleshoot, I burned a stock 91 program onto the same chip, used the adapter, and I could communicate with that as well. Any suggestions would be welcomed at this point.
Thread Starter
Melting Slicks
Joined: Oct 2000
Posts: 2,158
Likes: 9
From: N.E. WA
Tom, I don't get the sys light when I use the stock .bin. I also have some Atmel 29c256's that I will try instead.
Alvin, right now I am scanning with Diacom, and I put in a 91 Syclone Vin number and then select the turbo model. I have had trouble connecting to some vehicles with Diacom, but I thought the SYS light on the dash was a give away that something else was wrong.
Alvin, right now I am scanning with Diacom, and I put in a 91 Syclone Vin number and then select the turbo model. I have had trouble connecting to some vehicles with Diacom, but I thought the SYS light on the dash was a give away that something else was wrong.
Instructor
Joined: Aug 2004
Posts: 108
Likes: 0
Originally Posted by ANTI VENOM
I thought the SYS light on the dash was a give away that something else was wrong.
Code 41 will set if the ECM does not respond to the CCM poll. My guess is that the $58 code does not have support for the CCM, I could be wrong though...
