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Old 09-03-2019, 02:36 PM   #1
Dvpper_sf5
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Default Trans swap issues.

Okay so long story short I decided to swap an automatic wagon I got in a trade because automatic is boring and I like my left leg being slightly bigger and more muscular then my right.

Anyways, swap went smoothly and the car runs great, does what it’s supposed to and for the most part, everything works. Except my speedo. Not a big deal right?..........wrong.

So without a VSS Wired in my car has launch control all the time, even in the highway, or while accelerating from a stop if I’m not careful. I’m also thinking that the ECU isn’t calculating load correctly and without it The ECU can’t switch between fueling/timing maps and my OL/CL delay is all fooked as well.

So the trans I have is out of an 02, and the speed sensor on it, it has 3 wires. Green/yellowish/white. In that order from left to right Pin 1 is green, Pin 2 is yellowish, Pin 3 is white. From what I understand. The green is my signal, and the white is my ground.

So here is what I have tried.
1.) I have tried taking the signal to the ECU and the cluster directly, nothing happens.
2.) after finding out what Pin was what on my TCM I tried jumping all the wires into this. Nothing happened.
3.) A combination of the 2 strategies mentioned above.

I have read every thread on these swaps from legacies to foresters to WRXs and not a single one has a definitive answer in what I should do but apparently a lot of people have done this and are driving cars that have been swapped. I’ve tried to PM people asking for specifics as some threads have stated. But that has led me nowhere. So please if anyone on here has any idea how to make my speedometer work and have the ECU register it as well, please please please let me know.

Or if your from PA (north eastern) and wanna get paid to make my speedo work, DM me.
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Old 09-03-2019, 05:46 PM   #2
Fozymandias
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Ground to ground pin on ECU power to 12v Power on ECU signal to signal input on ECU.

Then, tee off the signal wire and run it to pin 13 on the b55 plug of your transmission control module (green wire with black stripe)
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Old 09-03-2019, 10:01 PM   #3
Dvpper_sf5
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Quote:
Originally Posted by Fozymandias View Post
Ground to ground pin on ECU power to 12v Power on ECU signal to signal input on ECU.



Then, tee off the signal wire and run it to pin 13 on the b55 plug of your transmission control module (green wire with black stripe)

So your saying ground from sensor to ground pin for VSS on my ecu? Cause no ecu pinout has which exact pin is the exact VSS ground. And i also have no idea what pin is the 12v specifically for that sensor, So I’m lost on that. I’ve searched and searched and even have the factory FSM saved on my laptop, still no helmet can I find which pin is which.

I know which pin on my ecu is the signal input.
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Old 09-04-2019, 01:28 AM   #4
Fozymandias
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Any ground will do - there isn’t a specific VSS ground. There are a number of ‘power ground’ pins on your ECU any of this will do

There is also a 12v in - providing power to the ECU agin you’ll see it on a pinout - use that for your VSS power.

So, VSS ground to any power ground on your ECU

VSS power to 12v in on your ECU

VSS signal to VSS input on your ECU

Then tee that signal wire over to pin 13 on the b55 plug of your transmission control unit.

You can use any 12v power supply and any ground - I’m just telling you which way definitely worked for me
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Old 09-04-2019, 11:31 PM   #5
Dvpper_sf5
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Quote:
Originally Posted by Fozymandias View Post
Any ground will do - there isn’t a specific VSS ground. There are a number of ‘power ground’ pins on your ECU any of this will do



There is also a 12v in - providing power to the ECU agin you’ll see it on a pinout - use that for your VSS power.



So, VSS ground to any power ground on your ECU



VSS power to 12v in on your ECU



VSS signal to VSS input on your ECU



Then tee that signal wire over to pin 13 on the b55 plug of your transmission control unit.



You can use any 12v power supply and any ground - I’m just telling you which way definitely worked for me


Okay cool. I’ve been at this for a few days and it’s starting to get frustrating as hell man. I saw your comment on the other thread so I’m gonna give this way a try and hopefully I’ll have a speedo again. Thanks a lot man.
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Old 09-05-2019, 11:10 AM   #6
Dvpper_sf5
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Quote:
Originally Posted by Fozymandias View Post
Any ground will do - there isn’t a specific VSS ground. There are a number of ‘power ground’ pins on your ECU any of this will do



There is also a 12v in - providing power to the ECU agin you’ll see it on a pinout - use that for your VSS power.



So, VSS ground to any power ground on your ECU



VSS power to 12v in on your ECU



VSS signal to VSS input on your ECU



Then tee that signal wire over to pin 13 on the b55 plug of your transmission control unit.



You can use any 12v power supply and any ground - I’m just telling you which way definitely worked for me


Okay so I have everything wired up. BUT I don’t have a wire in my pin 13 slot on my B55 plug. It’s an empty terminal. According to my FSM it’s right below Pin 4 and my pin 4 is a yellow with black stripe. Am I looking at this wrong? I’m pretty sure I’m reading the plug the right way in my FSM.
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Old 09-05-2019, 11:20 AM   #7
Dvpper_sf5
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The only green wire with a black stripe I have on my TCM plugs is on the green connector. And I’m pretty sure that is plug B54 not B55
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Old 09-05-2019, 12:04 PM   #8
Fozymandias
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You have PM sir
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Old 09-05-2019, 12:09 PM   #9
Dvpper_sf5
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Originally Posted by Fozymandias View Post
You have PM sir


I appreciate all your help with this. So I had to do it a little differently then you. I’m in a 2003 USDM wrx. What I had to do was wire my signal to pin17 of the green TCM plug and then T from that to my ECU speed sensor PIN.

After looking at the FSM that pin is what provides signal to cluster and ECU from the sensor. I had to also T from that to my ECU speed sensor pin.
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Old 09-05-2019, 01:32 PM   #10
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Is it all working now? I should have mentioned that whilst the on the manual cars, the VSS goes directly to the ECU/Cluster, on the auto it gets routed through the transmission control first and then to the cluster and ECU.
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Old 09-05-2019, 03:14 PM   #11
Dvpper_sf5
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Originally Posted by Fozymandias View Post
Is it all working now? I should have mentioned that whilst the on the manual cars, the VSS goes directly to the ECU/Cluster, on the auto it gets routed through the transmission control first and then to the cluster and ECU.


Yeah I had figured that much prior to undertaking this endeavor. My speedo is working now, my ecu is reading vehicle speed (at least that’s what ROMRaider Logger says). But now I’m having an issue with an erroneous idle, and I seem to hit a fuel cut around 4K RPMs I think it has something to do with the Neutral Safety Switch, because I had wired it in and then turned the code back on on my current ROM and now at 4K RPM it feels like it’s hitting a brick wall.

Anyways I think it has to do with the 12pin connector, because my reverse lights work, they were pins 9&10 but I’m thinking 1&4 aren’t where my NSS goes to. I’m thinking our pinouts May be different just as how our plugs were different for where to put the Speed Sognal wore. I have no idea but we’re gonna find out.
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Old 09-05-2019, 03:56 PM   #12
Fozymandias
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The NSS on the autos and manuals are reversed from a polarity point of view. On one, 5v means neutral and 0v means drive, on the other it’s the reverse.

If you do wire it in to the 12 pin plug, you can still get an issue where the signal feeds back via the ‘N’ light on the cluster and causes confusion. You also end up with the ‘N’ light on when in gear all the time. Best to wire the signal into the NSS pin on your ECU and ground it at the ECU also.

Re the fuel cut and idle, reset the ECU and let it relearn idle before doing anything else, if the issue still persists on the idle side, check your front O2 sensor - mine crapped out shortly after the swap caused big idle issues but that may just have been coincidence.

Are you leaving any of the Transmission Control plugs plugged in or omitting them altogether?
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Old 04-25-2021, 12:43 PM   #13
Fozzy_Futura
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Quote:
Originally Posted by Fozymandias View Post
Any ground will do - there isn’t a specific VSS ground. There are a number of ‘power ground’ pins on your ECU any of this will do

There is also a 12v in - providing power to the ECU agin you’ll see it on a pinout - use that for your VSS power.

So, VSS ground to any power ground on your ECU

VSS power to 12v in on your ECU

VSS signal to VSS input on your ECU

Then tee that signal wire over to pin 13 on the b55 plug of your transmission control unit.

You can use any 12v power supply and any ground - I’m just telling you which way definitely worked for me
Trying to reviving this thread as i am having trouble to get the speedo working.

I had a 5MT swap done recently to my forester 2000 JDM S/tb equivalent to V5/6 GC8 ej20 . Been trying to get the vehicle speed sensor to work without any luck. Current transmission is from a GC8 v4 5MT with the old VSS 2 pin output, i've tried linking the VSS signal pin directly into the ECU and have the other pin grounded, that didn't work. I've also read that i might be able to make it work by re-pin it to the cluster first then it will send the right pulse/signal to the ECU, but i am not sure which pin to try on the cluster. Any one with swap experience can point me to right direction? Much appreciated!

p.s. not running any signal through the TCU. i've removed it completely, everything else runs perfectly except for the speedometer.
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Old 05-25-2021, 05:03 PM   #14
Rhino781
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Originally Posted by Fozymandias View Post
Is it all working now? I should have mentioned that whilst the on the manual cars, the VSS goes directly to the ECU/Cluster, on the auto it gets routed through the transmission control first and then to the cluster and ECU.


Hey man, I know this post is old but I just did a auto to manual swap on an 05FXT. I’ve got everything figured out with the exception of which pen to ground on the EC you to put it in manual mode also I have the three wires coming in from the speed sensor and have them going both over to the traction control module into the EC you but not sure which pens on the ECU to connect to as I don’t have a proper schematic for that or a pin out! Can you help at all?
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Old 05-25-2021, 05:49 PM   #15
snow_bound26
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Quote:
Originally Posted by Rhino781 View Post
Hey man, I know this post is old but I just did a auto to manual swap on an 05FXT. I’ve got everything figured out with the exception of which pen to ground on the EC you to put it in manual mode also I have the three wires coming in from the speed sensor and have them going both over to the traction control module into the EC you but not sure which pens on the ECU to connect to as I don’t have a proper schematic for that or a pin out! Can you help at all?


There shouldn't be a pin for that ECU. It's the ROM that's flashed to the ECU that matters. The pin to ground was older cars like the GC Imprezas and 1st gen Forester for instance.
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