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The mkiv Supra Owners Club

speedo not working


T14PPA

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was yours auto? because my auto box has been playing up because of the speedo?

 

Yes mine is an auto. And funny you should mention it but my box has been a little funny. It will disengage from reverse when it's cold. It engages again after about 10 seconds. I never thought it was related to the speedo though.

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I started my car this morning, it was very frosty, the car started fine and then I seen a spark coming from the drivers footwell, then I smelt burning, after driving I noticed my speedo was not working :(

 

Is it possible it could be a fuse? Because my supra has been converted from KPH to MPH so it probably is the speedo converter, but I don't want to take my dash apart :( haha

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Sort of. Another was fitted which then also went pop almost right away but it was old and 2nd hand. It was taken out and is just in kph at the mo. Waiting for the time to fit the new one

 

OK I never got a chance to look for the fusebox lastnight but my OD light is now flashing so it has to be the speedo cable that everyone is talking about, my mileage isn't going up which is a little worrying... Are the KPH to MPH converter kits expensive?

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OK I never got a chance to look for the fusebox lastnight but my OD light is now flashing so it has to be the speedo cable that everyone is talking about, my mileage isn't going up which is a little worrying... Are the KPH to MPH converter kits expensive?

All your problems are down to a single cause: the speedo isn't getting an speed signal into it, possibly due to a faulty speed converter (good ones are probably just shy of £100 approx. Cheap ones can be had for a lot less but they have minor but annoying side-effects).

 

The odometer and the O/D light are "downstream" from the speedo, so when the speedo doesn't work, neither will these things. You'll also find your ECU has logged a code 42 error: again, it's all down to the same single cause.

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so my speed converter is fried! :[ owel, i'll probably just go for one of the £30 ones off of ebay, or should i avoid them?

Your speed converter is the most likely cause. The sparking you saw suggests something was shorting out, but that could have been almost anything. It's most likely to be part of the loom that's been fiddled with, e.g. the speed converter.

 

As for the £30 converters: I wouldn't want to fit one to my car unless I heard from reliable members on here that the specific model I was about to buy worked well, and didn't muck up the ancilliaries. There's more to speed conversion than just making the speedo show a different number. The ECU uses the speed to work out how much power steering assistance to use, how to control the overdrive AFAIK, etc.

 

If you like having over-assisted power steering even at high speed so that you get no feeback through the wheel, then crack on and buy a cheap converter. ;)

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Your speed converter is the most likely cause. The sparking you saw suggests something was shorting out, but that could have been almost anything. It's most likely to be part of the loom that's been fiddled with, e.g. the speed converter.

 

As for the £30 converters: I wouldn't want to fit one to my car unless I heard from reliable members on here that the specific model I was about to buy worked well, and didn't muck up the ancilliaries. There's more to speed conversion than just making the speedo show a different number. The ECU uses the speed to work out how much power steering assistance to use, how to control the overdrive AFAIK, etc.

 

If you like having over-assisted power steering even at high speed so that you get no feeback through the wheel, then crack on and buy a cheap converter. ;)

 

well that doesnt sound re-assuring so i might give that £30 unit a miss, lol

 

ive just had a look behind the dashboard from the footwell and i can see the speed converter, its a "SpeedM8" and it is connected to a number of wires :[ cringe

 

Fife-20111109-00437.jpg

 

Fife-20111109-00438.jpg

 

im not too confident in mucking about with these cables myself, not sure if they are soldered in, plugged in, or even where they run to, so i think im just going to take it to a garage that specialises in that kind of stuff :[ hello over-priced labour! meh

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  • 2 weeks later...
  • 1 year later...

I see a few people had this fault. Was all of yours speed converter related?

 

I have a post but can't get an answer so maybe a little input from some of you that have had the problem.

 

Here's my post:

 

Since i bought my jdm tt6 8+ years ago it has read speed & distance in miles. Since the car was left in the garage for a few months i have had no speed or distance reading on my car. I have stripped the dash looking for a speed converter but can't find nothing at all. Looking at the ecu the pink wire at the top right has a green wire with speed sensor wrote on it bridged into the pink but is only about a foot long & left under the carpet going no where.

 

I dyed my carpet black a few years ago & noticed this wire back then but all was working fine so thought nothing of it.

 

Any ideas what way my car must be reading miles or where else i can look for a converter?

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Ive heard it can be in the footwell aswell but mine was behind the dash. Definately the converter

 

I have followed the wires from behind the clocks to the ecu & can't see anything :(

 

I don't understand what way it can be wired because i thought it had to be connected to the pink wire on the ecu?

 

Doesn't make sense to me, it read in MPH but no signs of nothing wired to ecu?

 

I'm going to have to look at this again. Am i right in thinking a speed converter is about wallet size?

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My speed converter was the size of 2 stamps lol

 

Ah crap life just got worse, now i'm looking for a needle in a haye stack lol.

 

Can you remember if yours was wired into the ecu or could it be wired away from the ecu somewhere?

 

Sorry to keep throwing questions but this is doing my head in this weekend.

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