Go Back   MustangForums.com > Ford Mustang Tech > 4.6L (1996-2004 Modular) Mustang
Sign in using an external account
Register Forgot Password?
Search


4.6L (1996-2004 Modular) Mustang Technical discussions on 1996-2004 4.6 Liter Modular Motors (2V and 4V) within.
Sponsored by Cruizin Concepts


Welcome to Mustang Forums!
Welcome to Mustang Forums.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!


Reply
 
 
 
 
Thread Tools Search this Thread
Old 05-14-2012, 11:45 PM   #1
kast1376
3rd Gear Member
 
kast1376's Avatar
 
Join Date: Jun 2006
Vehicle: 2004 GT
Location: Sacramento
Posts: 638
Johnny-Goonhand
Send a message via Yahoo to kast1376
Default Confirmation for speed sensor cable

I am installing a new stereo this weekend, and I need to tap the speed sensor wire for the GPS to work properly.

I just need a confirmation that it is the WH/OG wire, pin 68 on the PCM.

Now I have no clue where the PCM is, as I haven't dug into the car that much. Where is this located within the passenger compartment? Is there a closer spot to tap in relation to where the stereo would go?
This ad is not displayed to registered or logged-in members.
Register your free account today and become a member on Mustang Forums!
__________________

Quote:
Originally Posted by Margarita Girl View Post
I like happy endings. Just saying.
LM1s, MGW, MM subframes and CC, H&R SS, Blues, Bassani Catted X, 13" brakes, 3.73 gears
kast1376 is offline   Reply With Quote
Old 05-15-2012, 07:19 AM   #2
cliffyk
TECH SAVANT
 
cliffyk's Avatar
 
Join Date: Dec 2006
Vehicle: 1998 SL500
Location: Saint Augustine, FL
Posts: 10,909
Default

The bad news is that there is no Vehicle Speed Sensor on the GT's.

But the good news is that the PCM uses the transmission OSS (Output Shaft Speed) sensor and parameters programmed in the tune to create a VSS signal on pin 68 of the PCM.

More good news is that it can be tapped at the radio, as shown in the diagram below:

Click the image to open in full size.

It is fed to the radio for the vehicle speed controlled volume setting.

I find it curious that the GPS should require a VSS signal, as a GPS is entirely capable of calculating speed all by itself--and far more accurately than the vehicle's system. With 4 or more channels locked in a GPS is accurate to 0.1 mph--maybe it's so the GPS can display something if it can only lock onto 1 or 2 satellites?
__________________
-cliff knight-
SOLD! - 2003 GT, UPR X, FRPP 24lb/h, Magnaflow, PP 70mm TB & plenum,
Delta Force tuned, Steeda UDPs, Ralco flywheel,
RAM HDX clutch, 3.73s, 262 rwHP/305 lb-ft.

New ride (7/1/2013) 1998 Mercedes SL500-5.0L 32V VVT 326/347 HP/tq


Engineering is, at its base, making what you want from what you have.
At its extreme it is making what you want from what you can get.
cliffyk is offline   Reply With Quote
Old 05-15-2012, 06:20 PM   #3
kast1376
3rd Gear Member
 
kast1376's Avatar
 
Join Date: Jun 2006
Vehicle: 2004 GT
Location: Sacramento
Posts: 638
Johnny-Goonhand
Send a message via Yahoo to kast1376
Default

Thank you for the help Cliffy!

The install instructions says it is for the GPS, but does not clarify. I would guess it is for the reasons you stated.

However, I am also guessing it is so the DVD player cannot be used while the car is moving. Grounding out the green brake wire was a common way to allow the DVD to play at any time, but newer models supposedly are tied into the speed sensor.
__________________

Quote:
Originally Posted by Margarita Girl View Post
I like happy endings. Just saying.
LM1s, MGW, MM subframes and CC, H&R SS, Blues, Bassani Catted X, 13" brakes, 3.73 gears
kast1376 is offline   Reply With Quote
Old 05-15-2012, 06:24 PM   #4
cliffyk
TECH SAVANT
 
cliffyk's Avatar
 
Join Date: Dec 2006
Vehicle: 1998 SL500
Location: Saint Augustine, FL
Posts: 10,909
Default

Quote:
Originally Posted by kast1376 View Post
Thank you for the help Cliffy!

The install instructions says it is for the GPS, but does not clarify. I would guess it is for the reasons you stated.

However, I am also guessing it is so the DVD player cannot be used while the car is moving. Grounding out the green brake wire was a common way to allow the DVD to play at any time,
but newer models supposedly are tied into the speed sensor.
That makes more sense! I suspect if you leave it disconnected the GPS will be just fine...
__________________
-cliff knight-
SOLD! - 2003 GT, UPR X, FRPP 24lb/h, Magnaflow, PP 70mm TB & plenum,
Delta Force tuned, Steeda UDPs, Ralco flywheel,
RAM HDX clutch, 3.73s, 262 rwHP/305 lb-ft.

New ride (7/1/2013) 1998 Mercedes SL500-5.0L 32V VVT 326/347 HP/tq


Engineering is, at its base, making what you want from what you have.
At its extreme it is making what you want from what you can get.
cliffyk is offline   Reply With Quote
Old 05-15-2012, 09:20 PM   #5
kast1376
3rd Gear Member
 
kast1376's Avatar
 
Join Date: Jun 2006
Vehicle: 2004 GT
Location: Sacramento
Posts: 638
Johnny-Goonhand
Send a message via Yahoo to kast1376
Default

Quote:
Originally Posted by cliffyk View Post
That makes more sense! I suspect if you leave it disconnected the GPS will be just fine...
I plan to run it un-tapped and tapped and see if it makes any difference in the GPS, or if it just affects the DVD capability (if it does at all). Should make for a slightly fun nerdy project . It will be at least 3 weeks til I can get to it. Hope the Mach 460 holds on til then.
__________________

Quote:
Originally Posted by Margarita Girl View Post
I like happy endings. Just saying.
LM1s, MGW, MM subframes and CC, H&R SS, Blues, Bassani Catted X, 13" brakes, 3.73 gears
kast1376 is offline   Reply With Quote
Old 05-15-2012, 09:20 PM
MustangForums
Ford Mustang




Paid Advertisement

 
 
 
Reply

Tags
94, 96, body, carb, censer, find, fox, gps, gt, instructions, manual, mustang, sensor, speed, transmission, vehicle, wire

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

Advertising

Featured Sponsors
Vendor Directory
New Sponsors
All times are GMT -5. The time now is 08:48 PM.

© Internet Brands, Inc.


This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. Ford® is a registered trademark of the Ford Motor Company
Emails Backup