Hi,
I have searched this subject to no end with no answer. I did find a post on a Camaro site that tried to explain it, however the connector they speak of is not in my car, that I can find.
Here is what I did, removed the carb for Holley Sniper system. In doing so, it isolated the ecm. From that point on, I had no Cruise control. Fast forward to actually removing the ecm and all its wiring, I then lost the speedo. The VSS module gets it ground from the connection to the ecm. I re-established a ground on the VSS and the speedo works. There were three cables coming from the ecu. Two main connectors that go the harness to the engine bay and a cable coming from two connectors, where the wires go up up under the dash. One of those connectors had a ground wire that was not grounded. I grounded the VSS ground and plug ground to a chassis bolt.
Still no cruise. Attached photo show the the two items under the passenger side of the car, and how I grounded them. (1987 Formula 305 engine)

I would appreciate any help you can give me. I am sure I am not the only that had this problem.

Thanks....Louis

 

Anybody??

Louis

 

ECM doesn't control the cruise. The CC module depends on the signal from the yellow buffer box. My CC works with my stand-alone (LINK) and I am using an SGI-5E to control the various vss signals with the yellow buffer box deleted.

GD

 

Hi GD, your link does not work. Thanks for the reply.

Louis

 

It's not a hyperlink. I'm running a LINK stand-alone ECU.

GD

 

Hi GD,

Now I know what you are talking about.
thanks,

Louis