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The mkiv Supra Owners Club

Speedo converter playing up


chris0132

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Hi guys the other day I was going to my mot done a couple hard pulls on the way nothing too mad and the speedo was working fine, (its an import tt with mph converter) went through the mot fine no issues, but on the way home the speedo changed and started reading what I'm guessing kph as its not mph, any ideas what it could be do the converters just break sometimes?, maybe a bad connection?. I don't know the make of it or where it would be located as I've only had the car about a month so any help would be awesome

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Converters in general do have a reputation of failing. Some makes are a lot more reliable than others. Reasons for failing tend to be either it's a cheap ebay unit to begin with, or the soldering to splice it to the loom is shoddy.

 

It's very unusual for them to revert back to reading kph though: are you sure about this? If they fail, you usually lose the entire speed signal and the speedo stays at zero.

 

The converter is usually placed somewhere behind the speedo clocks (you'll need to take the dashboard fascia off, not a hard job), but sometimes they are mounted above the gearbox. You're generally looking for a very small device with 4 or 5 wires coming out of it. It can be as small as a piece of chewing gum.

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