Looking for a schematic or link for the installation of the digital cruise control w/ a 3800 swap. I search and found what seems to be the defacto thread on the subject, but the threads is quite old and missing the pictures. wondering if someone has a link to a more up-to-date thread?
FWIW; im using the motor/ECM from a 2000 GTP in an 88gt
These are the threads I started to go through, but am wondering if there is one specific to a 3800 swap
A, Grey = E on CC. conncetor, lt Green B, dk Blue = A on CC. conncetor, dk Blue C, Gray/Black = D on CC. conncetor, lt Blue/Black D, Brown = A on SC connector, Purple E, Black = B on SC connector, Black F, Pink = ?? G, White = ?? H, dk Green = B on SC connector, Black J, White = ?? K, dk Green = 3800 ECM; 4k ppm, pin ??
F - Says it needs to be connected to ign1 12v B+ source (or blue wire on trans rev light witch). Where should I grab this wire from, ECM? G - Say it goes to terminal "30" of the relay. which relay and where is it located? J - Says its not used; but could I run a wire anyway, just in case I wanted to install a dash light? Does this supply a ground or +12?
I am running wires through the firewall and want to include any additional wires I may need
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10:20 AM
85GT_3800SC Member
Posts: 92 From: Thunder Bay , Ontario , Canada Registered: Nov 2007
Hey ALJR! I will be putting cruise control into my 85 GT from a 98 GTP when I do my 3800SC motor swap next year. To that end, I have been working on a master schematic of sorts. The drawing isn't finished, but the cruise control part is done, so I posted a cropped portion of the schematic below for what it might be worth.It's a bit grainy.If you want a high res image, PM me and I'll send one.
[This message has been edited by 85GT_3800SC (edited 11-02-2012).]
Hey ALJR! I will be putting cruise control into my 85 GT from a 98 GTP when I do my 3800SC motor swap next year. To that end, I have been working on a master schematic of sorts. The drawing isn't finished, but the cruise control part is done, so I posted a cropped portion of the schematic below for what it might be worth.It's a bit grainy.If you want a high res image, PM me and I'll send one.
Thanks for that diagram!
Couple questions regarding it:
About pin H on the Digital cruise, how does one know if its needed? The footnote on Sinisters wiring diagram says "Some electronic cruise modules will need this circuit left open, or will need to be grounded to operate properly, depending on vehicle origin" . I am using the "AR" module, any idea if I need this conencted?
What is the point of adding the relay?
Where is C246 located?
Is the Fiero Crusie Control Module removed? If so, what happens to the connector?
[This message has been edited by ALJR (edited 11-02-2012).]
I am using a Rostra electronic cruise control on a 3800 SC Series III engine (2006 GTP) and am quite pleased with it. This is available with either a box or stalk type control.
Nelson
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01:40 PM
85GT_3800SC Member
Posts: 92 From: Thunder Bay , Ontario , Canada Registered: Nov 2007
About pin H on the Digital cruise, how does one know if its needed? The footnote on Sinisters wiring diagram says "Some electronic cruise modules will need this circuit left open, or will need to be grounded to operate properly, depending on vehicle origin" . I am using the "AR" module, any idea if I need this conencted?
I haven't researched this yet, but trying ground/no ground seemed easy enough.
quote
What is the point of adding the relay?
The relay is supposed to give the change in state required at G relative to D (12v / 0v) to inhibit cruise when the brakes are applied.There may be other ways of achieving this, but this one was used by Aland with success.
quote
Where is C246 located?
C246 is located at the stock Fiero cruise control module, to the right of the gas pedal,under the carpet
quote
Is the Fiero Crusie Control Module removed? If so, what happens to the connector?
Yes, the stock module is removed and you use the connector. This is C246.
** The drawing I posted is an amalgamation of info and ideas I found while researching the cruise control install. I wanted to put it all on one drawing for ease of understanding during my install next year. The accuracy seems good to me, but I have yet to actally do the install and prove the information.
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02:49 PM
Dave E Bouy Member
Posts: 1465 From: Kettle Point Ontario Canada Registered: Sep 2004
Is there a location inside the passenger cabin that I can tap into the Purple wire for the "cruis vacuum release solenoid"? Is it located in the stock Fiero CC module, connector C246?
Im running wires in the loom through the firewall and need to know if I should add another wire. Im catching pin D of the digital cruise from the old/unused solenoid connector in the engine bay but also have to tap into this wire with my relay...
Anyone know the lables or definitions for pins D, F, & J of the unused wires on the C246 connector (stock Fiero CC module)?
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09:23 PM
PFF
System Bot
phonedawgz Member
Posts: 17104 From: Green Bay, WI USA Registered: Dec 2009
Is there a location inside the passenger cabin that I can tap into the Purple wire for the "cruis vacuum release solenoid"? Is it located in the stock Fiero CC module, connector C246?
Use the Brown/White that runs to the stock cruise control module. The wire will have power on it when the cruise is turned on, and neither the brake or the clutch is depressed.
Use the Brown/White that runs to the stock cruise control module. The wire will have power on it when the cruise is turned on, and neither the brake or the clutch is depressed.
Im confused, Don't I want the wire to be normally ground when cc is on then change to +12 when brake/clutch is depressed? According to the diagram above, the relay is providing +12v to pin G, then changes to ground when interupted (brake/clutch depressed); clicking relay "on" when terminal 85 on the see +12v
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10:43 PM
phonedawgz Member
Posts: 17104 From: Green Bay, WI USA Registered: Dec 2009
The purple wire at the vacuum release solenoid has +12v on it when the brake and clutch pedal are not depressed. The voltage on the purple wire activates the vacuum solenoid and allows the vacuum to build in the cruse. If power doesn't reach the solenoid, the vent is open and the cruise will not operate.
GM designed the Fiero cruise this way so it would fail safe. That is that if the +12v signal isn't present the cruise is disabled.
------------------ Pin H (Dk Green) is a cruise control inhibit pin. You can wire this to the PCM cruise control inhibit output provided your PCM has it's VSS input properly programmed. If you don't care to have the PCM inhibit the cruise control you should just ground this wire.
[This message has been edited by phonedawgz (edited 11-05-2012).]
The purple wire at the vacuum release solenoid has +12v on it when the brake and clutch pedal are not depressed. The voltage on the purple wire activates the vacuum solenoid and allows the vacuum to build in the cruse. If power doesn't reach the solenoid, the vent is open and the cruise will not operate.
GM designed the Fiero cruise this way so it would fail safe. That is that if the +12v signal isn't present the cruise is disabled.
Ahh, I had it backwards...
So pin D on the digital module see +12v under normal operation, then changes to ground when the brake is pressed? And pin G on the digital module see ground under normal operation, then changes to +12 when the brake is pressed?
Its one thing to just wire it up as the schematics tell me to; I also like to understand how it works and whats going on. Sorry for all the questions
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12:35 PM
Darth Fiero Member
Posts: 5922 From: Waterloo, Indiana Registered: Oct 2002
Will any of these cruise control work with a Drive By Wire?
I've gotten a few questions about this recently so I would like to discuss it (sorry for hijacking the thread)...
Some DBW swaps can have functioning cruise control systems. Typically in the donor cars that these DBW engines and systems came from, the cruise control switch would be wired up directly to the ECM. Some early DBW cars used a simple combination cruise switch that worked just like the stock Fiero cruise switch, but later cars used a single wire cruise switch signal - and these are more complicated. The later cruise switches that used the single signal wire used the "stacked resistor" method of being able to send several different switch signals over a single wire - which means you are going to have to duplicate these resistor values in your Fiero cruise switch if you want to be able to duplicate that type of signal. You will need the factory wiring diagrams for the vehicle you got the DBW ECM out of in order to set this up - but this doesn't guarantee a functioning cruise control system. The reason why is because many of these cars also had a brake pedal position SENSOR which hooked up to the BCM. And if you didn't install the BCM from the donor car in your Fiero when you did the swap, this signal will never be forwarded to the ECM via the data bus and therefore cruise control operation may never be permitted. I'm discussing this very situation with a fellow Fiero guy who can't seem to get his cruise control working (DBW engine).
Now, if you run into this situation, a possible work-around is to get one of these digital cruise servo setups and connect the cable from it to the gas pedal of the DBW setup somehow (the cruise servo will actuate the gas pedal itself instead of the throttle body). However, I can't stress caution enough when hooking it up in this way for obvious reasons.
-ryan
------------------ OVERKILL IS UNDERRATED Custom GM OBD1 & OBD2 Tuning | Engine Conversions & more | www.gmtuners.com
[This message has been edited by Darth Fiero (edited 11-06-2012).]
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07:06 PM
Darth Fiero Member
Posts: 5922 From: Waterloo, Indiana Registered: Oct 2002
So pin D on the digital module see +12v under normal operation, then changes to ground when the brake is pressed? And pin G on the digital module see ground under normal operation, then changes to +12 when the brake is pressed?
