D2a TD5 - no speed signal

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Originally Posted by biggin

Interesting. I’m having a similar problem but don’t have a speed correction device installed. In the last couple of days, for the first start of the day, the speedo doesn’t work and the odometer doesn’t count. But only for about 10 minutes and then comes good. No warning lights present throughout. Very strange.

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My speedometer and odometer are working fine still even with the error.

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Originally Posted by twr7cx

Interestingly enough, two years later, with a fully functional C1600 Ratio Interface Unit from Hunter Di Spare Parts Company I'm getting the error again - "(22,1) ROAD SPEED MISSING, (LOGGED)."

Doesn't seem to be having a negative effect on the vehicles operation though.

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I have this fault, no effects on Speedo, no Amigos, no effects on ABS, HDC or CC.
But: Amber ACE Light.
Stored Fault „Road Speed Signal Missing“ at ACE.

D2 TD5 Automatik with 265/75 and obviously working Hunter Di unit.

Where should I start to look for a fault? What do you think?

Every time I plug Nanocom in I get the "road speed missing" fault. I have been getting it for years.

Every thing works as it should. I too have a speedo correction device, for around 10 years.

I have just assumed that this was the cause of this fault.

So you don’t think the ACE Light doesn’t belongs to the Speed Signal Fault?

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Originally Posted by Werdenfelser

I have this fault, no effects on Speedo, no Amigos, no effects on ABS, HDC or CC.
But: Amber ACE Light.
Stored Fault „Road Speed Signal Missing“ at ACE.

D2 TD5 Automatik with 265/75 and obviously working Hunter Di unit.

Where should I start to look for a fault? What do you think?

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Check your rear axle ABS cable plug and socket connectors are clean and dry, and that the cables are all secured and not ‘flopping’ about. I wrapped some electrical tape around my left rear connector because the plug was a little loose in the socket. It has been all good now for a couple of years. Also the Hunter DI installation instructions are a little cryptic when it comes to working out which wires to use. Which colour wires on the Hunter unit have you used for signal in and signal out?

For anyone suffering these faults "road speed signal missing" etc etc, and with the Hunter Di fitted, I'd take a punt that it has been fitted at the actual slabs ECU output.

I have no issue with this unit, but I'd suggest to avoid these faults, and to fix poor gear shifting on the auto (if you have one), that you fit the unit just before the Speedo, no guarantee it'll fix these problems of course, but for some of you it will.

Cheers
James

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Originally Posted by onebob

Check your rear axle ABS cable plug and socket connectors are clean and dry, and that the cables are all secured and not ‘flopping’ about. I wrapped some electrical tape around my left rear connector because the plug was a little loose in the socket. It has been all good now for a couple of years. Also the Hunter DI installation instructions are a little cryptic when it comes to working out which wires to use. Which colour wires on the Hunter unit have you used for signal in and signal out?

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Thank you!
Checked everything and everything fine.

The Hunter Box is running since 5(?) Years. No problems so far.
But had a lot of problems with ACE. All mechanical. Changed all pipes, new pump and so on. Was fine for a year or so.

The last month amber light.

Checked all electric connections and sensors as far as possible for me.
Put a new ACE ECU in.
Nothing. Still amber light.

Drove to the city a week ago. Starting there, Red ACE light…

Aaargh…

Ordered non-ACE ARB‘s and all the stuff.

And imagine what?

No lights since…



And I can confirm: „missing road speed signal“ makes no ACE Lights…