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Old 07-18-2014, 03:15 PM   #1
xluben
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Default xluben's MapDCCD Wheel Speed Sensor (VSS) Photos, Installation, and Review

MapDCCD Wheel Speed Sensor:



Link to Website:
http://mapdccd.com/vss.html

Link to Manual:
http://mapdccd.com/media/MapDCCD_whe...tall_guide.pdf

Why would you need this? This module is used when you swap a newer transmission (that does not have a speed sensor built into the housing) into an older car that does not have a way to pull the vehicle speed from the ABS (like newer cars do). Specifically putting an 08+ transmission (5MT or 6MT) into an 02-07 (or older) car. As more and more 08+ parts are hitting the used market (often in better condition than 02-07 parts) it is likely that this will be needed more frequently.

What are the available versions and the differences? There will be two versions of this module available. The first one, which I have, is more basic and is used simply to feed a speed signal into the ECU. It can use one or two wheel sensors, and only has a single output (vehicle speed to the ECU). The second model will be able to use up to four wheel sensors and will be able to output to the ECU and to the MapDCCD controller (if installed). The DCCD integration will detect wheel slip and adjust DCCD locking accordingly.

Photos:









Initial Impressions:

This VSS unit is very small and well packaged. It is a single PCB with surface mount components on one side and easy to read labeling and logos on the other side. The board is protected by a transparent plastic case (similar to a very thick heat shrink wrapping). It has a socket connector on one end of the board and two adjustment buttons on the other end. The wire connector for the basic model has 7 individual wires coming off of it. Two of them (secondary wheel sensors) had heat shrinked ends because they are not necessary. If you wanted to use these, you would cut/strip the wires.

For single wheel input all you need to connect is ground, switched power, positive and negative VSS inputs, and the VSS output to the ECU. The module itself is very small and light and can be mounted anywhere that is convenient (I have mine zip tied under the dash). Overall I'm impressed with the small form factor and great level of quality in the product's physical appearance. The labeled wire locations is a huge plus for ease of install. The socket connector is also great, because you can leave the module out on your workbench while you get all the wires run and connected, and then simply plug the module in when you're done.

Installation:
  • Black/White = Ground (ECU Ground)
  • Red = Power (12V Switched Power)
  • Yellow = VSS Out (Connect to ECU VSS input - pin A1)
  • White: Wheel 1 - (White Wire at ABS Sensor)
  • Brown: Wheel 1 + (Black Wire at ABS Sensor)
  • White: Wheel 2 - (White Wire at ABS Sensor)
  • Brown: Wheel 2 + (Black Wire at ABS Sensor)
The first five of these connections are mandatory for functionality. The last two can be connected to add redundancy and slightly increase speedometer response and accuracy, but they are purely optional. The black/white wire goes to chassis ground (I grounded mine near the ECU). The red wire I ran to a Add a Circuit (fuse tap) going to a switched 12V circuit in the fuse box (I used the rear wiper). You could also splice into the clock wiring to reduce the amount of extra wiring that needs to be run. I already had wires run to the fuse box, so that was the easiest for me.

Once the module has power and ground, then it just needs the input and output signals to be connected. For the input signal the brown wire and white wire need to be run through the firewall and into the engine bay. With the glove box out there is a grommet that can be used, and once pulled through the wires will reach the front passenger side signal. I tapped in to the ABS wires just after they entered the engine bay through the fender. There is a white wire and a black wire (for 2002 WRX). Match up the white with white and black with brown.

Alternatively, you could run the VSS input signal wires to the ABS module that if further forward in the engine bay and use the main harness up there. The location I used is a bit hard to reach, so the more open space may be preferable to some. It is also easy to tie into two or more signals at this point. The last thing you need to connect is the VSS output to the ECU. The yellow wire off the VSS goes to pin A1 on the ECU (for the 2002 WRX). This can be accessed by pulling up the passenger front carpet and removing the plate over the ECU.



Review:

The installation of this unit was very straightforward (and was especially easy for me due to the fact that I previously had a different module installed). The MapDCCD VSS module does not require any special precautions to be taken when choosing input power, ground locations, or VSS inputs. The VSS input wires do not have to be run out to the hub, and they do not need special shielding. Power and ground can be connected just like any normal gauge install. No secondary ground is required.

After it's all hooked up you can start up the car and go for a drive. The buttons on the module can be used to increment the speed signal up or down to calibrate it. I checked it compared to a phone GPS app and it was within 1%, (which was great because my summer tires are slightly taller than stock, but my winters are stock size) so I didn't have to make any adjustments. After that is set, you can tuck the module away and finish putting together your carpet/dash.

I've had this unit installed for a couple weeks now and it has been flawless. Unlike other units that have issues with signal integrity (and can often give erroneous 0mph or even 150mph readings) this unit has been working without a single hiccup. It is responsive, accurate, and works as expected every time. I have not been able to make it falter no matter what I have done. The circuit appears to be far more robust to weak or varying input signals and can handle them without issue.

Overall, this is an A+ from me. If a VSS module is something you need, then this is the way to go!
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Last edited by xluben; 07-22-2014 at 11:56 AM.
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Old 07-18-2014, 04:09 PM   #2
Jet Slicker
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YES!! Yes yes yes! No more stupid VSSPro!
Looks very promising. And I like the added support of the MAPDCCD aswell, since I'll be installing one shortly.

Very interested in this.
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Old 07-18-2014, 04:14 PM   #3
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very nice!! anyone wanna buy my VSSpro haha
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Old 07-18-2014, 04:15 PM   #4
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I'm swapping an '08 WRX 5mt into a GC, and I was going to make my own unit with ABS signal and Dakota Digital's universal speedo interface unit. Glad to see another option once this becomes available.
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Old 07-18-2014, 04:37 PM   #5
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Nice! The VSS module offered by a different company has not worked out well for a friend of mine running an 08+ tranny in his 05 WRX. He lost ABS and the speed input hasn't even been working. It has been telling the ECU the speed is 158 when he is at zero.

Glad to see these guys offering a new solution. I've been very happy with their DCCD controller.

Just to confirm, there is NO loss of ABS functionality with this unit is there?
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Old 07-18-2014, 04:42 PM   #6
xluben
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Quote:
Originally Posted by Jet Slicker View Post
YES!! Yes yes yes! No more stupid VSSPro!
Looks very promising. And I like the added support of the MAPDCCD aswell, since I'll be installing one shortly.

Very interested in this.
Highly recommended!

Quote:
Originally Posted by omgawg View Post
very nice!! anyone wanna buy my VSSpro haha
Me too!

Quote:
Originally Posted by JoshP View Post
I'm swapping an '08 WRX 5mt into a GC, and I was going to make my own unit with ABS signal and Dakota Digital's universal speedo interface unit. Glad to see another option once this becomes available.
Definitely an easier solution here.

Quote:
Originally Posted by WRXt4cy View Post
Nice! The VSS module offered by a different company has not worked out well for a friend of mine running an 08+ tranny in his 05 WRX. He lost ABS and the speed input hasn't even been working. It has been telling the ECU the speed is 158 when he is at zero.

Glad to see these guys offering a new solution. I've been very happy with their DCCD controller.

Just to confirm, there is NO loss of ABS functionality with this unit is there?
Many people have had the issues with the "other" VSS option either giving no output or 150+mph output. I have not heard of any issues with ABS functionality. Both of these splice into the ABS signal in similar fashion. Are you sure the wiring to the ABS unit wasn't daged during install?
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Old 07-18-2014, 04:47 PM   #7
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Quote:
Originally Posted by xluben View Post
Highly recommended!


Me too!


Definitely an easier solution here.


Many people have had the issues with the "other" VSS option either giving no output or 150+mph output. I have not heard of any issues with ABS functionality. Both of these splice into the ABS signal in similar fashion. Are you sure the wiring to the ABS unit wasn't daged during install?
He was having trouble getting a signal and they told him to CUT, yes CUT the wires and hook up that way rather than tap into them. When asked about ABS he was told it was not intended to be retained. Speed input seemed to work hit and miss but mostly miss now and there's no ABS due to how he was told to install.
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Old 07-18-2014, 04:54 PM   #8
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Thank you Ben...

Last edited by rexworx; 07-18-2014 at 05:07 PM.
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Old 07-18-2014, 05:14 PM   #9
xluben
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Quote:
Originally Posted by WRXt4cy View Post
He was having trouble getting a signal and they told him to CUT, yes CUT the wires and hook up that way rather than tap into them. When asked about ABS he was told it was not intended to be retained. Speed input seemed to work hit and miss but mostly miss now and there's no ABS due to how he was told to install.
Oh hell no. Definitely don't have to do that.

You just splice in and ABS works like normal. I just tested it. My VSSPro was spliced in and ABS worked but the actual speedo reading worked less than 50% of the time. This story is very common, and always blames it on an install issue. But I've never heard them go as far as saying to cut the wires before! I've sent my VSSPro back in for them to review and repair.

Quote:
Originally Posted by rexworx View Post
Thank you...
You're welcome.
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Old 07-22-2014, 11:57 AM   #10
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FYI - The website has now been updated with the full info on the VSS.

Link to Website:
http://mapdccd.com/vss.html

Link to Manual:
http://mapdccd.com/media/MapDCCD_whe...tall_guide.pdf
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Old 07-23-2014, 05:38 PM   #11
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Yummy!!!!!
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Old 08-02-2014, 12:24 AM   #12
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spammer

Last edited by Unabomber; 08-02-2014 at 11:03 AM.
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Old 08-25-2014, 04:33 PM   #13
modliving
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Is the unit still working like a champ? I'm really considering not even installing the VSSPRo and going with this.
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Old 08-25-2014, 04:35 PM   #14
xluben
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Quote:
Originally Posted by modliving View Post
Is the unit still working like a champ? I'm really considering not even installing the VSSPRo and going with this.
Yes. Perfect 100%. No issues at all. VSSPro was about 50/50. I do have my VSSPro available for sale if anyone is interested.
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Old 09-05-2014, 10:14 AM   #15
modliving
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I just installed mine and I'm so happy I threw the VSSPro away. MapDccd is the way to go. No issues whatsoever and the initial calibration is pretty much spot on.
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Old 09-05-2014, 10:52 AM   #16
xluben
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Yeah I still have my VSSPro but it's probably ly about time to smash it. The MapDCCD speed sensor has been working perfectly and the push button calibration is great.
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Old 09-05-2014, 01:43 PM   #17
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Any chance a future version of this will actually be able to change the output for us ABS cars that want to run different tire sizes?
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Old 09-05-2014, 02:06 PM   #18
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Quote:
Originally Posted by Nightmaresmk View Post
Any chance a future version of this will actually be able to change the output for us ABS cars that want to run different tire sizes?
This would work fine for that...
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Old 02-07-2015, 07:56 AM   #19
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Alrighty, bump from the dead here.
(I was actually hoping that a year would have elapsed between now and when you did the initial installation so there'd be at least that much time of experience with the unit BUT eh, what can ya do.)

Well, long story made short, I need to replace my 5MT (bad bearing(s)). Using an 04/05 unit would require me locate an r160 with a 3.90 in it (I don't know of any) or to change out the transfer gears (runs about $450-$500 in parts from Subaru). The 06/07 units are the easiest but they are either too expensive or in poor condition. This leaves me with the '08+ units BUT the lack of a VSS on the bell housing makes that one a bit difficult.....until now.....


So.....what's your impression this much further down the road? Any issues or complaints??
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Old 02-07-2015, 08:18 AM   #20
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It is great! The VSSPro was total junk. Never worked right. This one from MapDCCD works flawlessly and it can easily calibrate for different tire sizes. Hooking it up is simple and it literally has not given me a single issue since installing it.


FYI - The 08+ WRX's have a 3.9 r160.
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Old 02-07-2015, 09:53 AM   #21
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Still working like a champ!
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Old 06-15-2016, 07:26 AM   #22
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Has there been any updates on reliability since the last post? I just ordered mine to work with an Outback XT 5mt in my '06 WRX.
Also, instead of splicing into power from the fusebox, would it be feasible to get power from the connector that used to feed the original speed sensor? It has all the required output wires in one place (PWR/GND/Signal).

Last edited by NoScoobForYou; 06-15-2016 at 12:25 PM.
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Old 06-29-2016, 10:35 PM   #23
xzuhto
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Default Still no speedo

Hello everyone,

I've recently acquired a 2005 Saab 9-2x Aero that has a stripped speedo gear. I've already got the MapDCCD VSS and I've got it 100% installed but I'm still not getting anything at the speedometer.

A little background:
I ran a shielded twisted 6 conductor to the ABS module at the front of the engine bay. I then chose one of the white and black pairs and soldered input 1 to them.

I actually cut the wire at pin A1 and soldered to the pig tail, but I did tap into a ground. I tapped into 12v switched power and verified that my unit had power. At this time I did a test drive to verify the MapDCCD VSS was receiving signal via the amber light and see if the speedo worked. I did have an amber light flashing but I had no speedometer. The CEL from no VSS had passed and I was no longer in limp mode.

I resoldered the original A1 wire thinking that must not just be the signal from the original VSS and did another test. This time it was successful and had a working speedometer and no CEL. I put everything back together and had no speedo when I did a final test to tune the device in, I once again had no working speedometer but still have flashing amber light. I tore it apart, verified my solder connections and tested continuity. Still no speedo. Any idea where I'm going wrong?

My only thought at this point is that maybe I need to remove the old VSS and let that plug hang under the car?

Any help would be great.
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Old 07-02-2016, 09:52 PM   #24
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I have my original vss unplugged and my mapdccd speed signal wire is hooked up to oem one that runs from cluster to Ecu.
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Old 07-04-2016, 09:55 PM   #25
xluben
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Quote:
Originally Posted by NoScoobForYou View Post
Has there been any updates on reliability since the last post? I just ordered mine to work with an Outback XT 5mt in my '06 WRX.
Also, instead of splicing into power from the fusebox, would it be feasible to get power from the connector that used to feed the original speed sensor? It has all the required output wires in one place (PWR/GND/Signal).
I haven't had a single issue with the MapDCCD VSS since I got it.

Quote:
Originally Posted by xzuhto View Post
Hello everyone,

I've recently acquired a 2005 Saab 9-2x Aero that has a stripped speedo gear. I've already got the MapDCCD VSS and I've got it 100% installed but I'm still not getting anything at the speedometer.

A little background:
I ran a shielded twisted 6 conductor to the ABS module at the front of the engine bay. I then chose one of the white and black pairs and soldered input 1 to them.

I actually cut the wire at pin A1 and soldered to the pig tail, but I did tap into a ground. I tapped into 12v switched power and verified that my unit had power. At this time I did a test drive to verify the MapDCCD VSS was receiving signal via the amber light and see if the speedo worked. I did have an amber light flashing but I had no speedometer. The CEL from no VSS had passed and I was no longer in limp mode.

I resoldered the original A1 wire thinking that must not just be the signal from the original VSS and did another test. This time it was successful and had a working speedometer and no CEL. I put everything back together and had no speedo when I did a final test to tune the device in, I once again had no working speedometer but still have flashing amber light. I tore it apart, verified my solder connections and tested continuity. Still no speedo. Any idea where I'm going wrong?

My only thought at this point is that maybe I need to remove the old VSS and let that plug hang under the car?

Any help would be great.
Not sure what the problem is, but unplugging the OEM one would be worth a shot.

Quote:
Originally Posted by BMXspears View Post
I have my original vss unplugged and my mapdccd speed signal wire is hooked up to oem one that runs from cluster to Ecu.
Good spot to do it.
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