Odd speedo issue

[MBDevotee]

Hi there,

Picked up my new (well new to me) CLK yesterday.

All ran beautifully back - until I'd been driving for about an hour. Then instead of rising and falling smoothly, the speedo started to move in "ticks" a bit like a second hand on a watch. I am confident it's reading pretty accurate, however It doesn't go smoothly up or down.

Turn it off at end of journey all ok.

This morning, starts ok, then after about 20min starts doing it again. Been driving an hour and suddenly ABS and BAS warnings come on dash. Pull over, turn off car, wait 10sec, restart - all faults gone and no memory in the Malfunction screen......

Please tell me it's something simple!!!!!!!!

Thanks

Grant

 

[television]

This all looks like a wheel sensor speed fault,in the beginning the fault was slight and only showed on the speedo,and later it turned off the ABS and ESP

Take them out and clean them 17 in the link and one each side

http://www.detali.ru/cat/oem_mb2.as...GA=722.607&CT=F&cat=45Y&SID=54&SGR=663&SGN=20

 

[Jay Gee]

I believe the speedo signal is an average derived from all four ABS sensors. Is this correct,Malcolm?

 

[television]

I believe the speedo signal is an average derived from all four ABS sensors. Is this correct,Malcolm?

Yes it is, as far as I know, there is no other way

 

[roofless]

you missed the link malc :Oops::Oops:

 

[television]

you missed the link malc :Oops::Oops:

Thank you it took 5 mins before that registeredand it will be worse tomorrow

 

[MBDevotee]

Thank you - I'll keep an eye on this and if it re-occurs I will def get that looked at (prob at an indie not MB!)