Suprab1 Posted October 20, 2012 Share Posted October 20, 2012 The Supra has been parked up for the best part of a year & i took it out last week as it was to be my wedding car & to my disgust it had a missfire as the 2nd turbo came in. So i took it for another drive today & the speedo isn't working now (it was fine the other day) & i'm getting code 42. Now i've searched & all i can find is faulty speed converters but i've had the car over 7 years with no problems & the converter was done before i bought it. Is there any thing i can check before i go buying a new converter & ripping out the old one only in hope it is the fault? Quote Link to comment Share on other sites More sharing options...
LOGIE Posted October 20, 2012 Share Posted October 20, 2012 "Parked up for a year"? might have mice living in your dash and enjoying sharpening there teeth on your wiring looms. SERIOUSLY it happened to me once. They also chewed halfway through an HT lead and the rubber cap of the top mount from my suspension. Little bas***ds. Quote Link to comment Share on other sites More sharing options...
Suprab1 Posted October 20, 2012 Author Share Posted October 20, 2012 "Parked up for a year"? might have mice living in your dash and enjoying sharpening there teeth on your wiring looms. SERIOUSLY it happened to me once. They also chewed halfway through an HT lead and the rubber cap of the top mount from my suspension. Little bas***ds. Don't say that, i do keep poison down in the garage so hope that keeps them out the car. I have been pulling it out the garage when ever i need more space for more cars when i'm working but it would only be out & in the garage. Quote Link to comment Share on other sites More sharing options...
Suprab1 Posted October 22, 2012 Author Share Posted October 22, 2012 Anyone have any idea where to start looking? Wheel sensors, behind dash, ecu conections or will it be more than likely the speed converter thing? Is there a way of testing these speed converters? Quote Link to comment Share on other sites More sharing options...
stevie_b Posted October 22, 2012 Share Posted October 22, 2012 They can be tested but you'd probably need an oscilloscope to do it. The speed signal is a square wave pulse, the frequency of the pulse giving the speed. An easier thing would be to try and remove the converter and run the car unconverted to see if that fixes the problem. The converters can and do spontaneously give up. It's happened to me. Being aftermarket parts, many are not built to the same quality standards as genuine Toyota electronics. Quote Link to comment Share on other sites More sharing options...
stevie_b Posted October 22, 2012 Share Posted October 22, 2012 The speedo fault will either be the speed sensor itself (unlikely but possible), the converter (including its wiring), the wiring from the converter to the speedo, or *maybe* the speedo itself (this last one's unlikely). The fault won't be at or near the ECU, that's downstream of the speedo. Locate the speed converter (probably behind the dash or maybe near the gearbox itself), and check to see the wires all look OK. Check the other ends of the wires as well, ensure they have decent non-dry solder joints. Quote Link to comment Share on other sites More sharing options...
Suprab1 Posted October 22, 2012 Author Share Posted October 22, 2012 The speedo fault will either be the speed sensor itself (unlikely but possible), the converter (including its wiring), the wiring from the converter to the speedo, or *maybe* the speedo itself (this last one's unlikely). The fault won't be at or near the ECU, that's downstream of the speedo. Locate the speed converter (probably behind the dash or maybe near the gearbox itself), and check to see the wires all look OK. Check the other ends of the wires as well, ensure they have decent non-dry solder joints. Cool mate. Tell me what size of a thing is this converter, would it be wallet size or alarm fob size ect? Quote Link to comment Share on other sites More sharing options...
stevie_b Posted October 22, 2012 Share Posted October 22, 2012 Alarm fob size. Likely to just be hanging in the air behind the dash fascia. Quote Link to comment Share on other sites More sharing options...
Suprab1 Posted October 23, 2012 Author Share Posted October 23, 2012 Alarm fob size. Likely to just be hanging in the air behind the dash fascia. Just as i feared lol. Thanks for your help, i shall start looking. Quote Link to comment Share on other sites More sharing options...
peter richards Posted October 23, 2012 Share Posted October 23, 2012 give this a go get the car out on the road and tap the platic glass quite hard and see if the needle picks up it did with mine Quote Link to comment Share on other sites More sharing options...
Suprab1 Posted October 23, 2012 Author Share Posted October 23, 2012 give this a go get the car out on the road and tap the platic glass quite hard and see if the needle picks up it did with mine I'll give this a go, maybe hit it with a hammer for being a nuisance lol. Quote Link to comment Share on other sites More sharing options...
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