VSS wiring question
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Senior Member
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From: Eastern TN
VSS wiring question
OK. Here's the question:
I need to know which wire exactly carries the "pulses" that drive the speedometer in my truck. (I believe this is the "VSS" wire?)
Is there a wire to be found inside the cab that is accesible without a dashboard disassembly, or will I find it easiest under the hood?
2001 'Screw, XLT.
Thanks for any help you can give me...
I need to know which wire exactly carries the "pulses" that drive the speedometer in my truck. (I believe this is the "VSS" wire?)
Is there a wire to be found inside the cab that is accesible without a dashboard disassembly, or will I find it easiest under the hood?
2001 'Screw, XLT.
Thanks for any help you can give me...
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Joined: Jun 2002
Posts: 10,511
Likes: 10
From: Under the flightpath of old ORD 22R
Hey B-Man, long time to talk with.
The VSS in the EVTM shows on page 42-2. There is actually 3 inputs. These are for the anitlock brakes, don't know if that would work for what you need. These are the toothed speed indicator rings used to determine wheel speed.
1 for each front wheel, and 1 for the rear diff.
The 4 wheel anti-lock brake system ( 4WABS ) module is located under the hood, kind of behing the driver's side headlamp. The connector is C146, a rectangular connector, key'd on one side, black in color. It shows as left front corner of engine compartment, might be one of the blocks, under the air cleaner housing.
The speed sensor from the front wheel is the yellow w/ black stripe ( low sensor ) and yellow with red stripe ( high sensor ) pair. If you want to take the rear diff sensor it is the light green with a black stripe ( low sensor ) and Red with pink stripe ( high sensor ) pair.
If this is not what you are looking for, on the PCM there is a vehicle speed output sensor, circuit 679, pin 68 it is gray with a black stripe. This is accessable behind the batter, where the PCM goes through the firewall under the hood.
I am not sure which one you are looking for, or what it is for.
Let me know if I got it or not, I'm heading out, and depending on how thig go, I may not be back until late tonight, so I can look it up then.
Let me know
Steve
The VSS in the EVTM shows on page 42-2. There is actually 3 inputs. These are for the anitlock brakes, don't know if that would work for what you need. These are the toothed speed indicator rings used to determine wheel speed.
1 for each front wheel, and 1 for the rear diff.
The 4 wheel anti-lock brake system ( 4WABS ) module is located under the hood, kind of behing the driver's side headlamp. The connector is C146, a rectangular connector, key'd on one side, black in color. It shows as left front corner of engine compartment, might be one of the blocks, under the air cleaner housing.
The speed sensor from the front wheel is the yellow w/ black stripe ( low sensor ) and yellow with red stripe ( high sensor ) pair. If you want to take the rear diff sensor it is the light green with a black stripe ( low sensor ) and Red with pink stripe ( high sensor ) pair.
If this is not what you are looking for, on the PCM there is a vehicle speed output sensor, circuit 679, pin 68 it is gray with a black stripe. This is accessable behind the batter, where the PCM goes through the firewall under the hood.
I am not sure which one you are looking for, or what it is for.
Let me know if I got it or not, I'm heading out, and depending on how thig go, I may not be back until late tonight, so I can look it up then.
Let me know
Steve
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Senior Member
Joined: Dec 2002
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From: Eastern TN
Thanks for the reply, Steve. I was wondering if you were going to show up...
I think I need the signal coming off the PCM.
Here's what I am doing:
I've been working on a circuit board to monitor the vehicle's speed. With that data, I am going to try and have it provide a couple of functions:
1. Interrupt the connection between the AC compressor wiring to the VSC on my Flex-A-Lite so that the fans don't run when the truck is moving faster than ?? MPH. Obviously, it will be adjustable and I have to do a little testing to see the minimum MPH needed to cool the truck.
2. Connect to a remote-control interface for my Alpine, so as I increase / decrease speed, the volume will go up or down accordingly. BTW, if anyone is interested, I will be using a programmable PIC so that other remote's software codes (Kenwood, Pioneer, etc.) could be loaded so this could work with other vehicles as well.
I want to find a good place to connect the VSS circuit, so that a connector could be used to avoid splicing or cutting into the factory wiring, you know?
Man I wish Chiltons or Haynes would release a book for my rig...
Brian
I think I need the signal coming off the PCM.
Here's what I am doing:
I've been working on a circuit board to monitor the vehicle's speed. With that data, I am going to try and have it provide a couple of functions:
1. Interrupt the connection between the AC compressor wiring to the VSC on my Flex-A-Lite so that the fans don't run when the truck is moving faster than ?? MPH. Obviously, it will be adjustable and I have to do a little testing to see the minimum MPH needed to cool the truck.
2. Connect to a remote-control interface for my Alpine, so as I increase / decrease speed, the volume will go up or down accordingly. BTW, if anyone is interested, I will be using a programmable PIC so that other remote's software codes (Kenwood, Pioneer, etc.) could be loaded so this could work with other vehicles as well.
I want to find a good place to connect the VSS circuit, so that a connector could be used to avoid splicing or cutting into the factory wiring, you know?
Man I wish Chiltons or Haynes would release a book for my rig...
Brian
Technical Article Contributor
Joined: Jun 2002
Posts: 10,511
Likes: 10
From: Under the flightpath of old ORD 22R
Brian,
Took me a bit, I was finishing putting my Master Bath back together. One thing that comes to mind:
The connector for the speed control servo. Connector 157.
Pin 3 ( on C157 ) is circuit 679 ( gray with a black stripe ) is the vehicle speed input.
This is from the PCM pin 68 on the PCM, which is the vehicle speed output sensor.
The speed control servo is next to the Stock air cleaner location under the hood. it is a black 10 pin connector. The servo is just behind where the stock air cleaner housing is at.
You can get to the PCm behind the battery on the pass side of the engine compartment. If you look close, you can see the numbers and verify the color code of the wire. Put a T-Tap in there, and you should have what you are looking for.
The other is to take the vehicle speed sensor from the radio wiring harness behind the radio. The radio connector is C224, this 20 pin connector. The Vehicle speed signal is here as well as circuit 679, behind the dash. Pin 9 is a gray with pick stripe here. Pin 9 is in the center of the connector. This is the connector with the CD harness in it, not the speaker harness.
So with the circuit 679 in the radio harness, you would think that the HU with a vehicle specific adapter, the speed sensative volume control should have been installed ??
Try this, and let me know what happens
Good luck
Steve
Took me a bit, I was finishing putting my Master Bath back together. One thing that comes to mind:
The connector for the speed control servo. Connector 157.
Pin 3 ( on C157 ) is circuit 679 ( gray with a black stripe ) is the vehicle speed input.
This is from the PCM pin 68 on the PCM, which is the vehicle speed output sensor.
The speed control servo is next to the Stock air cleaner location under the hood. it is a black 10 pin connector. The servo is just behind where the stock air cleaner housing is at.
You can get to the PCm behind the battery on the pass side of the engine compartment. If you look close, you can see the numbers and verify the color code of the wire. Put a T-Tap in there, and you should have what you are looking for.
The other is to take the vehicle speed sensor from the radio wiring harness behind the radio. The radio connector is C224, this 20 pin connector. The Vehicle speed signal is here as well as circuit 679, behind the dash. Pin 9 is a gray with pick stripe here. Pin 9 is in the center of the connector. This is the connector with the CD harness in it, not the speaker harness.
So with the circuit 679 in the radio harness, you would think that the HU with a vehicle specific adapter, the speed sensative volume control should have been installed ??
Try this, and let me know what happens
Good luck
Steve
Thread Starter
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Senior Member
Joined: Dec 2002
Posts: 1,558
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From: Eastern TN
Thanks for the info, Steve.
My HU did not come with the speed sensing circuitry; rather I'm building a circuit that outputs the Volume Up / Down infra-red codes, based on the vehicle speed sensor input.
Because I'm using a PIC with software control, I'm able to put about 6 separate programs in the unit, the selection of which program to run is set via a DIP switch. The idea is to make a "universal" unit that could work with the majority of HUs being installed by the guys on this forum.
Right now, I'm thinking:
Alpine
Kenwood
Pioneer
Sony
????
????
I think the circuit into the radio harness is where I'm gonna start. I need a connection that I can connect a frequency counter to so I can determine what the output range is, from say 1 MPH to 100 MPH. An inside the cab connection will allow me to drive and take readings at specific speeds, so that will be good.
Thanks again for your help. Next time I'm in Chicago, I'll take you & your wife out to dinner. Maybe you could give me a "crash course" in using the Ford Service CD. I'm still struggling with finding info I need with that thing. It sucks to be dumb...
BTW, what were you doing to your master bath ?
Brian
My HU did not come with the speed sensing circuitry; rather I'm building a circuit that outputs the Volume Up / Down infra-red codes, based on the vehicle speed sensor input.
Because I'm using a PIC with software control, I'm able to put about 6 separate programs in the unit, the selection of which program to run is set via a DIP switch. The idea is to make a "universal" unit that could work with the majority of HUs being installed by the guys on this forum.
Right now, I'm thinking:
Alpine
Kenwood
Pioneer
Sony
????
????
I think the circuit into the radio harness is where I'm gonna start. I need a connection that I can connect a frequency counter to so I can determine what the output range is, from say 1 MPH to 100 MPH. An inside the cab connection will allow me to drive and take readings at specific speeds, so that will be good.
Thanks again for your help. Next time I'm in Chicago, I'll take you & your wife out to dinner. Maybe you could give me a "crash course" in using the Ford Service CD. I'm still struggling with finding info I need with that thing. It sucks to be dumb...
BTW, what were you doing to your master bath ?
Brian
Technical Article Contributor
Joined: Jun 2002
Posts: 10,511
Likes: 10
From: Under the flightpath of old ORD 22R
Brian,
Ok, that makes sense, having to build out the IR link for the speed volume control. I would have thought it to be on the HU
The master bath, I tore out the shower walls with the tile on it, and the fiberglass base, and put in a Corian base and the 3 piece Corian wall surround kit. The shower doors the builder put in were leaking and needed some work, and somehow I got a little carried away with it
Still haven't picked out a new door set for it.
Good luck with the controller, let us know how the prototype goes.
Steve
Ok, that makes sense, having to build out the IR link for the speed volume control. I would have thought it to be on the HU
The master bath, I tore out the shower walls with the tile on it, and the fiberglass base, and put in a Corian base and the 3 piece Corian wall surround kit. The shower doors the builder put in were leaking and needed some work, and somehow I got a little carried away with it
Still haven't picked out a new door set for it. Good luck with the controller, let us know how the prototype goes.
Steve
Thread Starter
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Senior Member
Joined: Dec 2002
Posts: 1,558
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From: Eastern TN
Yeah Steve, isn't it funny how that stuff snowballs...
Where'd you buy the Corian stuff at ?
I'm currently looking for a new house, so I'm sure I'll be in the "Home Depot" mode in no time...
I'll let you know what I come up with.
BTW, you interested in a free unit if I get it going ? Let me know what HU you are using...
Brian
Where'd you buy the Corian stuff at ?
I'm currently looking for a new house, so I'm sure I'll be in the "Home Depot" mode in no time...
I'll let you know what I come up with.
BTW, you interested in a free unit if I get it going ? Let me know what HU you are using...
Brian
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Technical Article Contributor
Joined: Jun 2002
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From: Under the flightpath of old ORD 22R
Brian,
Funny, it is Murphy's law. Start out with just fixing one thing, and down she comes.
I went to the local KDA / PDA location, and ordered it there. The wall set is for a rough opening of a 48" wide x 36 Deep shower, which seems to be standard. The base I had made to be a little larger then the stock one, to match the 48" x 36".
They had a local place that does the shower stuff, I am sure the local KDA / PDA place by you has the same thing.
Nice thing is the Corian base is SOLID, no need to set it in motar like a fiberglass base. Weghted in at hefty 52#'s.
It took a bit, to get all the tile set, and grouted into place, but it is all done now. Dream to clean, and polish ( just like the truck with the Cyclo ).
As for the HU that I have, stock Ford, so I have the factory speed to volume control. Set at 3 on my 01, as the Bassani needs that level All I added were the Infinity Tweeters to help out Miles Davis, made a huge impact.
Good luck, let me know how it goes, and if I need to find something esle for it. Always here to help you.
Later Bro
Steve
Funny, it is Murphy's law. Start out with just fixing one thing, and down she comes.
I went to the local KDA / PDA location, and ordered it there. The wall set is for a rough opening of a 48" wide x 36 Deep shower, which seems to be standard. The base I had made to be a little larger then the stock one, to match the 48" x 36".
They had a local place that does the shower stuff, I am sure the local KDA / PDA place by you has the same thing.
Nice thing is the Corian base is SOLID, no need to set it in motar like a fiberglass base. Weghted in at hefty 52#'s.
It took a bit, to get all the tile set, and grouted into place, but it is all done now. Dream to clean, and polish ( just like the truck with the Cyclo
).As for the HU that I have, stock Ford, so I have the factory speed to volume control. Set at 3 on my 01, as the Bassani needs that level
All I added were the Infinity Tweeters to help out Miles Davis, made a huge impact.Good luck, let me know how it goes, and if I need to find something esle for it. Always here to help you.
Later Bro
Steve