Ok guys prob a bit out of the ordinary but on the rally car I won't be wanting abs and most of the fabia's have a speed sensor on the gearbox which can be used if the abs is removed , but on removing the engine tonite I noticed there is no place for a speed sensor on the 6 speed box.

Now I could leave the abs in place and just not have the brake pipes going to it but it is still going to try and work the traction all the time and cut the engine power I guess or ???? I dunno maybe mount a speed sensor in the box somehow maybe. anyone ever done it to the 6 speed casing and will the teeth be on the diff casing for it to count?

answers on a post card guys.

Just unplug the sensors

Snap the sensors off

Remove a fuse

Brake a wire on the sensors

This will turn off abs and traction control also, wheels will spin as much as they need and tyres can lock up when needed.

Pretty sure that's how it works and might be of some use, otherwise ignore me

Cheers

Ah but then I have no speedo which will in turn upset the engine ecu. quick tip, if you want to simply get rid for a while just unplug the multiplug and recode the canbus controller to say no abs and the warning lights will dissapear from the dash too, won't help my speedo tho :(

on the 6 speed ones the vss sender is mounted horizontally on the back of the differential casing near the top facing towards the rear of the engine bay. There's normally a plastic bung in there if it's not fitted.

on most of the late vw stuff the vss signal is wired directly to to the engine ecu, then it is sent to the abs controller and instrument cluster via canbus. But I'm not 100% sure how it's wired on a fabia! I presume it must be the same? But I was under the impression that the speedo signal is derived from the abs wheel sensors on a fabia which must originate from the abs controller, I guess a possible workaround is to use a golf/octavia ecu rather than a fabia one.

o

Nope nothing on the casing at all, there is a machined bit that looks like it would be drilled for a sensor tho, I'll take a better look once all the road crap is cleaned off it tho

Hello. 

 

My speedo does not work.

 

I replaced engine+gearbox and donor car was with abs. Now I have somekind of "plastic stick" ? hanging on top of gearbox  instead of hall sensor type vss (stupid me, why didnt leave original gearbox)..  

 

I'm using original engine ecu + donor car wiring loom.

 

Tried donor car ecu, theres more problems because it needs wideband lambda and extra pins aren't connected in engine bay loom (and i'm not going to replace it, horrible job, it's locked behind dash)

 

Ideas what to do?

Edited 24 October, 20187 yr by DtiJ

You have a mismatch between the electronics and what you've installed, you need a speed sensor on the gearbox which is not present and a wideband lambda on the exhaust manifold which you can retrofit in place of the lambda probe currently fitted. You need to see if the gearbox sensor can be retrofitted, if not you need to change the gearbox. I see no other way to solve your problems.

I think/hope you should find that a vehicle speed sensor will fit straight into the hole where the dummy sensor is, and the loom should have the necessary wiring for it there?

Do you still have the old gearbox with vss in it?

Just now, Wino said:

I think/hope you should find that a vehicle speed sensor will fit straight into the hole where the dummy sensor is, and the loom should have the necessary wiring for it there?

Do you still have the old gearbox with vss in it?

 

 

yes, there is still connector for sensor, but i'm not sure if dummy thing has a hole under it....

 

I have old gearbox with vss in it.

 

and going to wideband lambda + gearbox change + ecu change isn't option unless it can be done without removing dashboard. That's just horrible? Lambda connectors arent in engine loom but other big one under bonnet..

1 minute ago, DtiJ said:

not sure if dummy thing has a hole under it....

I think you should find out.

9 minutes ago, DtiJ said:

 

 

yes, there is still connector for sensor, but i'm not sure if dummy thing has a hole under it....

 

I have old gearbox with vss in it.

 

and going to wideband lambda + gearbox change + ecu change isn't option unless it can be done without removing dashboard. That's just horrible? Lambda connectors arent in engine loom but other big one under bonnet..

 

The ECU doesn't need changing, I assume the engine was a like-for-like swap. You simply have to provide the existing ECU with the missing sensors and all should be well.

21 hours ago, Wino said:

I think you should find out.

 

There was aluminium + plastic crap corroded and stuck, and no good way to remove it.  Can't even see there without endoscope. Just had to forgot idea of putting sensor to that location.

 

I sawed off plastic what was left from plug...

 

Found out that sensor needs  ~6 impulses per driveshaft rotation to be accurate.

 

Guess what? Driveshaft flange is bolted with 6 bolts  so I installed vss sensor different way.

 

I took sensor from original gearbox, made a little bracket for it and it now reads rotation from driveshaft flange bolts. I had to put little bit longer bolts so they come out of flange nicely.

 

 

 

 

Edited 25 October, 20187 yr by DtiJ

Loving that.