scoobycraig

Hi Guys, Where does the unit pick it's speed signal up from? As my avc-r seems to be jumping around! like this morning it peaked at 133mph in FIRST!!!!

My normal speedo is spot on! to the exact mph according to tom tom.

Any help much appreciated

Craig

jiffthejiffmanjaffa

iTrader: (10)

I think it picks it up from a sensor on the gearbox if memory serves. The signal is then routed to the AVC-r via the ECU.

So, could be a fault with the sensor, wiring or with the ecu. Others will know for sure. Wouldn't have thought it would be anything to worry about.

scoobycraig

Cheers jiffthejiffmanjaffa
Where's the sensor on the gearbox?? the only wires coming from there are the reverse light and the n postion? And the speedo cable lol

Forgot to mention it's on a my94 wrx

Jolly Green Monster

iTrader: (4)

depends how it was fitted but should be connected to the ecu pin for the vehicle speed sensor 2..

pinout
B95 pin 11.

Simon

scoobycraig

yeah it's all wired up fine. Tested all my conections and all seem to be fine. I've taken the clocks/speedo out and looked behind. There's a white box on the back of the dial that the speedo cable plugs into. Took that appart and found a metal wheel inside! has that got anything to do with it?

Jolly Green Monster

iTrader: (4)

presume then the car is an import and that is the speedo converter.. which is possible hit and miss

scoobycraig

yes it is an import simon. Do u mean the converter down by the gearbox?