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[Kate]

Moved to Cornwall yesterday. About half way there, while the cruise control was engaged, the abs and tc lights came on. The cruise control went off and the speedo went to zero. After about 30 miles the lights went out and the speedo started working again.

Since then the lights are sometimes on, sometimes off.

Just had a used abs ecu fitted recently.

Any idea what the fault might be?

Thanks very much.

[wiliferus]

I'm very much a Mig noob, but my guess would be a wheel speed sensor to knock out all those three things.

I'm sure some who knows a lot more will be along shortly...

[05omegav6]

Sounds like the new ecu isn't far behind the old one

If you still have the old one, send it away to be fixed sharpish

[Andy B]

....

Just had a used abs ecu fitted recently.

Any idea what the fault might be?

Thanks very much.

I'd say you need to be looking out for another ABS ECU 

[05omegav6]

....

Just had a used abs ecu fitted recently.

Any idea what the fault might be?

Thanks very much.

I'd say you need to be looking out for another ABS ECU 

MTF Mr B

[Andy B]

....

Just had a used abs ecu fitted recently.

Any idea what the fault might be?

Thanks very much.

I'd say you need to be looking out for another ABS ECU 

MTF Mr B

That's over my head ...... 

[terry paget]

I had a similar fault some years ago. I changed ABS ECUs several times, fault persisted. It turned out to be rear right hand reluctor ring split and wandering about on the half shaft, in and out of alignment with the sensor.Worth a look. I cured it by gluing it in place with Araldite. I have pics if you think it likely. 

[Toledodude1973]

Terry can you please put pics up , just for understanding thanks

[Andy B]

Terry can you please put pics up , just for understanding thanks

On the drive shaft ie from diff to rear wheel, there's a castellated ring .... that's the reluctor ring that the ABS sensors look at 

[05omegav6]

....

Just had a used abs ecu fitted recently.

Any idea what the fault might be?

Thanks very much.

I'd say you need to be looking out for another ABS ECU 

MTF Mr B

That's over my head ...... 

Not rude or obscure... simply Must Type Faster

[Kate]

I had a similar fault some years ago. I changed ABS ECUs several times, fault persisted. It turned out to be rear right hand reluctor ring split and wandering about on the half shaft, in and out of alignment with the sensor.Worth a look. I cured it by gluing it in place with Araldite. I have pics if you think it likely.

Yes pics would be really helpful, thanks.

[Andy B]

....

Just had a used abs ecu fitted recently.

Any idea what the fault might be?

Thanks very much.

I'd say you need to be looking out for another ABS ECU 

MTF Mr B

That's over my head ...... 

Not rude or obscure... simply Must Type Faster

Doh!  (33 secs faster it seems  )

[Toledodude1973]

i know the ring you mean now thanks, always learning with Omegas

[dbug]

Was it a recon or 2nd hand abs ecu you fitted Kate?

[Andy B]

i know the ring you mean now thanks, always learning with Omegas

The reluctors - both front & back) are basically the same on her Smart, as they were on my Senators (never ventured under the Merc yet  ) ) An exception was my C reg MKI Carlton, that used a single sensor that looked at the teeth on diff's crown wheel