Foxbody Mustang Cruise Control information, location, wiring diagrams

Mustang5L5

That is…until I whipped out my Bissell

Mod Dude

Feb 18, 2001

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Feb 6, 2021

#21

• Feb 6, 2021

• #21

DemonGT said:

Does the factory cruise require the factory ECU?

Click to expand...

no. It requires a VSS signal but is completely independent of the ECU

 

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Mustang5L5

That is…until I whipped out my Bissell

Mod Dude

Feb 18, 2001

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Apr 22, 2021

#22

• Apr 22, 2021

• #22

Ended up buying myself a Rotunda unit. I’ll test this out on my car when the time comes

 

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Cougar5.O

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May 4, 2021

#23

• May 4, 2021

• #23

On the "other site", there's a post about how to adjust the gain of the cruise control amplifier when a larger throttle body is used - any ideas on how to do this?

Intuitively I think adding a resistor in series/parallel with the servo control circuit might accomplish this. What do you think?

 

Mustang5L5

That is…until I whipped out my Bissell

Mod Dude

Feb 18, 2001

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May 5, 2021

#24

• May 5, 2021

• #24

I would think adding a resistor to two of the 3 wires coming out of the servo would sloe down it's function, but i wouldn't even know where to begin to figure out what the values would be. Seems like one of those things where it will need to be trial and error. If i had to guess where to start, perhaps another 25-50K ohms of resistance?

 

Kid wita 5oh

I'm definitely not in the original hole

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Jul 29, 2021

#25

• Jul 29, 2021

• #25

Are the black and yellow amplifiers interchangeable?

 

Mustang5L5

That is…until I whipped out my Bissell

Mod Dude

Feb 18, 2001

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Jul 29, 2021

#26

• Jul 29, 2021

• #26

Kid wita 5oh said:

Are the black and yellow amplifiers interchangeable?

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unknown. I’ve tried to find a pattern to see which ones were installed in once cars but it’s been inconsistent.

 

Kid wita 5oh

I'm definitely not in the original hole

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Jul 29, 2021

#27

• Jul 29, 2021

• #27

Ok, I just found mine is bad.

It's an 89 with the yellow one. It was 5spd swapped by the previous owner and still running the A9P ( In case that helps you find a pattern)
Most everything on the car is still original (or very old dealer replacement parts)

 

Mustang5L5

That is…until I whipped out my Bissell

Mod Dude

Feb 18, 2001

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Jul 29, 2021

#28

• Jul 29, 2021

• #28

From what I’ve seen, most 5.0s had the yellow one. I’d look for one of those units

 

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Kid wita 5oh

I'm definitely not in the original hole

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#29

• Jul 29, 2021

• #29

Will do, thanks (and thanks for this thread)

 

General karthief

wonder how much it would cost to ship you a pair

20+ Year Stangneter

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Sep 23, 2021

#30

• Sep 23, 2021

• #30

THEDOCTORx said:

Wow lot of great info here, my cruise control broke over a year ago and I couldnt find any info on this subject, thanks loads.
In regards to the amplifier I pulled one from a junkyard a while back and its black but cant remember the year i got it from but i think it at least was an 86(mines a 90LX and has a yellow amplifier) The one i pulled from scrap dosent have an id sticker(i can see where it used to be) and no part # that i can find in the molding. Do we know if there is any difference between the amplifiers? Or is it at least safe to hook it up and try? I want to start there. it seems like changing the amplifier and plugging the vac line thats at the pedal assembly seem to be the easiest first steps in troubleshooting the cc.

Click to expand...

that's not troubleshooting, that's replacing random parts, the only similarities are it's a mustang part for cruise control.
There are Ford repair manuals out there or a member here (if it were not posted here already) can post a page from the diagnostic page.

 

Mustang5L5

That is…until I whipped out my Bissell

Mod Dude

Feb 18, 2001

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Sep 23, 2021

#31

• Sep 23, 2021

• #31

I was never able to find any info on the differences between the various amplifiers. I imagine the differences are tuning in the rate at which the cruise corrects speed, min speeds it will activate and other vehicle-specific criteria.

Just a guess. I assume to find out those details would require someone from Ford who has access to the specific programming who can explain differences. I doubt that would exist

 

Brad Hanks

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Jul 21, 2017

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Feb 24, 2022

#32

• Feb 24, 2022

• #32

DemonGT said:

Does the factory cruise require the factory ECU?

Click to expand...

It doesn’t.

 

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S

STREETFIGHTER50

20+ Year Stangneter

Nov 15, 2004

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"Da land of d fog" South SF

Mar 18, 2022

#33

• Mar 18, 2022

• #33

How much weight are you a actually saving? I never use CC in my Mustangs and stock steering wheels. Anyone got a pic of all the components together? I’d like to see.

 

Mustang5L5

That is…until I whipped out my Bissell

Mod Dude

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Mar 18, 2022

#34

• Mar 18, 2022

• #34

I don’t have a pic of everything together, but when I was about to put CC on my car I had all the parts in a box for a few weeks to keep it together and move it around. I’d be surprised if it was anything more than 10 pounds.

The biggest weight item was the servo/cable.

 

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DemonGT

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May 6, 2022

#35

• May 6, 2022

• #35

So the factory CC works off the VSS and vacuum?

 

Mustang5L5

That is…until I whipped out my Bissell

Mod Dude

Feb 18, 2001

43,265

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Massachusetts

May 6, 2022

#36

• May 6, 2022

• #36

DemonGT said:

So the factory CC works off the VSS and vacuum?

Click to expand...

Pretty much. Its standalone from the ECU even though the 89+ cars share the VSS signal.

 

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DemonGT

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May 7, 2022

#37

• May 7, 2022

• #37

Im paranoid im going to rehook it and hit the "set" button and its going to go WOT

 

Mustang5L5

That is…until I whipped out my Bissell

Mod Dude

Feb 18, 2001

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May 7, 2022

#38

• May 7, 2022

• #38

Jack the rear off the ground and you can test it “driving” like that. Not the safest but it can be done easily.


The Ford manual actually tells you to disconnect the cable from the throttle body just in case it does go WOT during testing.

 

Last edited: May 8, 2022

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TIGGER

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May 14, 2022

#39

• May 14, 2022

• #39

Do you know if the servo cables are different between the 4cyl and 5.0 cars?

 

DemonGT

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May 14, 2022

#40

• May 14, 2022

• #40

Mustang5L5 said:

Jack the rear off the ground and you can test it “driving” like that. Not the safest but it can be done easily.


The Ford manual actually tells you to disconnect the cable from the throttle body just in case it does go WOT during testing.

Click to expand...

Did you ever test that Rotunda?