Making 84-88 Cruise Control Work with no ECM?

MrSony

Geezer
Nov 15, 2014
6,346
113
Des Moines, Iowa
Is it possible?
What does the ECM have to do with cruise?
Everything on my car is hooked up, save for the ecm and related wiring.
I've read something about grounding the VSS wire that used to ground through the ecm.

Any info is appreciated. Car is an 85 Regal, used to have the v6, has the K34 option.
 

78Delta88

Apprentice
May 23, 2022
66
18
SW Arizona
Is it possible?
What does the ECM have to do with cruise?
Everything on my car is hooked up, save for the ecm and related wiring.
I've read something about grounding the VSS wire that used to ground through the ecm.

Any info is appreciated. Car is an 85 Regal, used to have the v6, has the K34 option.
Yes you can there are many articles about this on internet. There was several companies that produced after market units back in the day...

The 700R and 4L60E had the Digital VSS. The reluctor is mounted on out put shaft and in place of the speedometer gear. The 2004R, TH200, 250, 350 and TH400 had an add on connected to the speedometer cable. It's about 6 inch long and connects to the Speedo gear on the transmission and then to the original speedometer cable.
 

oldsmobile joe

Royal Smart Person
Nov 12, 2015
1,950
113
mpls
You can use the factory cruise brain box that gets mounted above the gas pedal and the green vss box that is behind your instrument cluster.
 
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MrSony

Geezer
Thread starter
Nov 15, 2014
6,346
113
Des Moines, Iowa
You can use the factory cruise brain box that gets mounted above the gas pedal and the green vss box that is behind your instrument cluster.
As said I have all the components hooked up and they were functional when I bought the car. I'm just hooking them back up. The only thing missing from the equation is the factory ecm which, according to this diagram, only one wire goes to. I'm under the impression I can ground the black/white wire from the VSS and fool the cruise system into thinking the ecm is still there as apparently it grounded through the ecm.
 

pagrunt

Geezer
Sep 14, 2014
7,531
113
Elderton, Pa
As said I have all the components hooked up and they were functional when I bought the car. I'm just hooking them back up. The only thing missing from the equation is the factory ecm which, according to this diagram, only one wire goes to. I'm under the impression I can ground the black/white wire from the VSS and fool the cruise system into thinking the ecm is still there as apparently it grounded through the ecm.
Is it possible an aftermarket GPS set might work to get the road speed?
 

oldsmobile joe

Royal Smart Person
Nov 12, 2015
1,950
113
mpls
This is close as i can get. 85 cutlass schematics.
 

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oldsmobile joe

Royal Smart Person
Nov 12, 2015
1,950
113
mpls
Here is vehicle speed sensor info.
 

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MrSony

Geezer
Thread starter
Nov 15, 2014
6,346
113
Des Moines, Iowa
It works!
 
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