Jump to content

Can I pull wheel speed from ABS


Recommended Posts

The new transmission I have put in my car don’t have the transmission speed sensor. So now the ecu cant read speed nor can my dash 

is there anyway I can get speed signal from the abs? Or other solutions? 

Link to comment
Share on other sites

45 minutes ago, Adamw said:

It's like extracting blood from a stone sometimes...

What version/year/model WRX? Does it have traction control and DSC?  And is it a plug-in ecu or wire-in?

It’s a 2003 WRX , with a plug and plug link G4x , no traction control 

Link to comment
Share on other sites

I think splicing into a wheel speed sensor will likely work in this car, It will depend on how sophisticated their fault checking is and whether the -ve is isolated from ground or not (the diagnostics manual suggests it is not isolated).  

The easiest access is probably in the main ABS unit connector.  Pin 9 is the FL wheel speed signal, try splicing into this and connect it to a spare DI on the ECU.  In the ecu software, set FL wheel speed to the DI you connected it to, make sure the pull-up is off, set the calibration to say 1000 as a starting point and go for a drive to see if you get a speed reported in the ecu and no ABS lights on the dash.  

If that works then report back and I will give further info on how to get the speed signal to the dash.  



Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...