Faulty Vss

[MM92]

Hi,

My Dad's recently got a MK1 Focus and it's caught a common MK1 fault.

The speedo sometimes drops out and comes back (not too much of an issue) but sometimes it won't even move from 0.

I've ordered a new VSS to be replaced as after looking online this seems to cure this.

The car will sometimes cut out during low RPM's when the speedo is sat at 0, especially when coming up to roundabouts and lights.

My question is does the VSS give any readings to the battery at all telling it how much power is needed at all because I did a DTC code check and it came back with 9318 (low battery output).

It's a brand new battery and has been checked for output as well as the alternator. (both reading fine).

Would the VSS be giving the battery incorrect power required readings hence the engine cutting out?

Thanks.

[artscot79]

Is the battery a silver or double calcium battery or is it lead acid if its a lead acid battery thats youre issue with the low battery fault

[MM92]

Not too sure, I'll have a look tomorrow.

What would be the issue if it wasn't a lead acid battery?

[artscot79]

It wont take a proper charge it will boil up cause electrical issues to name a few if it is a silver calcium battery it may be a cluster fault not the vss

[MM92]

Replaced the VSS and today the car still cut out.

Any idea on what would now be causing this? From what I've read the VSS seemed to sort this. All the same symptoms.