Speed incorrect on speedometer

[Deanojones]

2004 transit minibus now a camper

Issue i have is the speedo reading 70 when im doing 30mph any ideas what it could be or where to look first, the person i bought it off sent me this reply as i was told it could be the wrong diff…..

Hey mate great to hear from you and glad you’re enjoying the van.

Don’t buy a diff!

I remember it fairly well so apologies for the long winded answer as I’m not technical.

The speedo originally worked so it’s not a diff change or anything like that.

Not long after I purchased the van it would only fire up intermittently so I spoke to the guy I bought it from and he’d had issues with a fuel pump sensor before and a company called autotronics had fixed it.

So I sent it there and it didn’t resolve.

I then tested a different ecu and that didn’t fix it either

Finally I purchased a reconditioned fuel pump (about £900!) and used the reconditioned pump sensor and while it worked fine since then the speedo was out.

I then sent the pump, sensor and ecu back to autotronics and they were sh*t and as I’d already spent a fortune on the pump, the work to be done and a recon ecu thought I’d live with the speedo

Any help or advice to get this sorted please

Thanks

Dean

[metalworker0]

if it does not have ABS ..I would suspect the hall sensor at the gearbox.

all the best.mark

[knobby1]

if it does not have ABS ..I would suspect the hall sensor at the gearbox.

all the best.mark

Mk6 doesn't work off the ABS sensors like a Mk7...even if it has ABS. Will be taken from gearbox sensor.

Lord Knobrot (Smithy).

[Deanojones]

if it does not have ABS ..I would suspect the hall sensor at the gearbox.

all the best.mark

Thanks Mark, can you send link to purchase please, im willing to try anything… been to france did 1000 miles and its put 3000 on the clock

[metalworker0]

sorry cant do that too many choices of gearbox .. i don;t know what one youlve got

there you do :

1. first choice British or Turkish

2. Second choice in British .. is three gearboxes
3. and the Turkish one has three gearbox choices

There you go

You find it, since you have the info, that i don't

https://www.catcar.info/ford/?lang=en


all the best.mark

[dumper]

If it’s still got original gearbox and axle maybe Ford can identify it from the reg number or has it a part number on the sensor

[Deanojones]

if it does not have ABS ..I would suspect the hall sensor at the gearbox.

all the best.mark

Thanks Mark, can you send link to purchase please, im willing to try anything… been to france did 1000 miles and its put 3000 on the clock

Thanks, iv ordered one today so fingers crossed but i have my doubts, hope your right

[Deanojones]

If it’s still got original gearbox and axle maybe Ford can identify it from the reg number or has it a part number on the sensor

Went on a site and put my registration in and pointed me to the 1, just hope it works, il keep this thread updated if it does
Thanks

[Frag]

Needs the axle ratio and tyre size setting checking in the pcm.

These can be changed and the revs per mile,ids standard would do it but will likely do a full reflash if settings are changed.
Don’t know if forscan is capable

[metalworker0]

Don't know about that, just looked at a speedometer on ebay and looks mechanical with drum type mile gauge .. he said his mileage gauge was going up at a faster rate as well, so linked to the gearing thtat drives the speedometer .. which i think is driven by an electric motor , powered by the hall sensor ?? , just guessing.
all the best.mark

[Deanojones]

sorry cant do that too many choices of gearbox .. i don;t know what one youlve got

there you do :

1. first choice British or Turkish

2. Second choice in British .. is three gearboxes
3. and the Turkish one has three gearbox choices

There you go

You find it, since you have the info, that i don't

https://www.catcar.info/ford/?lang=en


Iv changed the sensor today and still the same, any other suggestions please im willing to try anything to get the speedo reading correctly
Thanks

Dean


all the best.mark

[metalworker0]

well you could go the forscan route as frag suggested .. but i have sort of got a gut feeling there is nothing digital about the set up and it is analogue.

i put into google a question:

old style hall sensor in gearbox - clocks reading double speed

read this ... if link doesn't work .. put in: old style hall sensor in gearbox, clocks reading double speed

https://www.google.com/search?q=old+sty ... nt=gws-wiz



all the best.mark

[Frag]

Is the bus a rwd 5 speed ?
Not the tdci with 6 speed?
Or a 5 speed originally,with a 6 speed fitted ?

If it’s all the same drivetrain as it left factory
The PCM is going to be the issue,it’s either got the wrong software completely,or the axle ratio / tyre size setting configuration is wrong for that vehicle
You need someone who knows what they are doing with a laptop.

If it was a 5 speed from factory,and someone’s converted it to 6 speed you may have same issue.

[Deanojones]

well you could go the forscan route as frag suggested .. but i have sort of got a gut feeling there is nothing digital about the set up and it is analogue.

i put into google a question:

old style hall sensor in gearbox - clocks reading double speed

read this ... if link doesn't work .. put in: old style hall sensor in gearbox, clocks reading double speed

https://www.google.com/search?q=old+sty ... nt=gws-wiz



all the best.mark

Yes its analogue mark

[Deanojones]

Is the bus a rwd 5 speed ?
Not the tdci with 6 speed?
Or a 5 speed originally,with a 6 speed fitted ?

If it’s all the same drivetrain as it left factory
The PCM is going to be the issue,it’s either got the wrong software completely,or the axle ratio / tyre size setting configuration is wrong for that vehicle
You need someone who knows what they are doing with a laptop.

If it was a 5 speed from factory,and someone’s converted it to 6 speed you may have same issue.

5 speed rwd all same as left factory, as stated in original post that I put a snippet from previous owner he changed fuel pump and had ecu sent off