Thread: D2a TD5 - no speed signal

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.

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?

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?

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