Modern Vespa

Hello,

Speedo is not working, ABS EFI and ABS lights stay on. What can cause it.

Thanks

on an GTS with ABS the speedo is driven by the real wheel speed sensor via the ABS.

Did you have the rear tire changed recently? ....

The speed ring / tone wheel on the rear could have become bent. Or the sensor for it might not have been installed correctly (apparently if the washers for the screw are missing that can cause problems as the spacing will be wrong?). Of course could also be any of the related wiring but less likely.

Look at the this senor and wiring and the speed ring for something wrong.

Pic

With that in place what is the gap to the slotted tone abs wheel AND is that a consistent gap as you rotate the wheel ALL the way around.

PS were there any washers when you took the screw out?

AND as I asked, has the rear tire been replaced recently?

Anyone know if an ASR calibration would fix op's problem?

nope.

asr wouldn't cause abs light or speedo issues. (although the opposite of abs light causing asr issue is possible)

Few more pictures
Is the distance for the sensor to wheel in pic 2 correct?
Thanks

Looks about the same as mine.

Have you checked the fuse for the ABS unit?

Which one is the fuse for the ABS? The ones in the glove box and by the battery are good.

Measured my abs sensor gab in 3 different spots rotating the wheel. 2 spots it fit and 1 spot it didn't. 0.787mm seemed liked the best guesstimate. I wonder what the spec is supposed to be?

Workshop manual says

Sensor distance - tone wheel
> 0.8mm

Few more pics

I don't think it's the tone wheel or sensor anymore (now that you've recently shown enough pics etc.)

I'm thinking it's the ABS unit itself is not happy (as @greaasy said) or wiring somewhere between the ABS and the sensor.

Is this the part?

yes that is an ABS unit. can't confirm the part number is suitable from those pics

Ok, here are pics of the ABS unit (if mean anything)
Thanks

Just noticed this; means anything

that shows the part number 1C001630

I'm not sure the difference between that 1C001631 which I see in the parts manual

And the other side

As far as I know: A new ABS unit must be taught-in: PADS is required…

How to test if it's bad?

1C001630 seems no longer available from Piaggio. In none of the online stores you can find anything about it or it can not be ordered...

See also:
2015 GTS300 ABS pump 1631 / 1630 Compatibility status

I think you're wrong*. reading the hpe manual for replacing the abs unit (very detailed instructions) it does not mention pads software.


* unusual

Few available used

"ATTENTION !

The installation and programming of the control unit must be carried out by a Piaggio workshop."

https://www.scooter-center.com/en/control-unit-abs-piaggio-vespa-gts-125-zapma3100-vespa-gts-150-zapma3200-zapma3100-vespa-gts-300-zapm45200-zapm45202-zapma3300-vespa-gts-super-125-zapm45300-zapma3100-zapm45301-vespa-gts-super-300-zapm45200-zapm45202-zapma3300-gp1c001631

From this I concluded that programming with PADS would be necessary. What else could be meant here?

*2016 is non-hpe

scooter center also says that for the part number for the HPE 1C002747

yet the manual doesn't ...

It's not a HPE

we know, but please read carefully what has been said