bayside_supra Posted December 29, 2014 Share Posted December 29, 2014 Hi people I had a chance to have a look behind the dash in my new Supra yesterday to try and sort the issue with the speedo reading incorrectly. The car is an aerotop with a TT6 speed conversion. It has a 180 MPH speedo fitted as the pic below. The problem is that the speed you are doing is indicated on the orange KPH section rather the the white MPH numbers. So if you are driving at 30MPH the needle will be at 20 MPH, drive at 70 MPH the needle will be just over 40 MPH etc... Hopefully that makes sense? Here are pics of the wiring behind and the only suspect wire I can see is the green and white one which seems to lead all the way down to the gear stick. The rest all look part of the normal loom. I have no idea how to lacate a speedo converter if there is one but I am hoping these pics might help someone more knowledgable advise me on what to do. I am scared to cut anything and have no speedo at all! Any help would be really appreciated. Karl Quote Link to comment Share on other sites More sharing options...
Tommyd16 Posted December 29, 2014 Share Posted December 29, 2014 Try and put all the wires back they should be. Ie make sure all the colours match and no extra wires. Then get a decent speedo convertor from Thor racing would be my suggestion Quote Link to comment Share on other sites More sharing options...
bayside_supra Posted January 4, 2015 Author Share Posted January 4, 2015 I assumed the car had a speedo convertor already and may not need one so I was planning to try disconnecting it. Being a newbie I have no idea how to find it. Can anyone help with this? Quote Link to comment Share on other sites More sharing options...
Morzy2k5 Posted January 4, 2015 Share Posted January 4, 2015 Where does that other red wire go that is at the bottom Of those pictures looks like it's going the same Route as the green wire you have pointed out.have a look down the front of where the clocks sit behind the dash panel the converter will be a small black box.it has deffinetley got a converter fitted as some one has cut the blue wire with a red stripe Quote Link to comment Share on other sites More sharing options...
The Raven Posted January 5, 2015 Share Posted January 5, 2015 (edited) edit Some screwing with the speed sonsor and the clocks, Clearly is working as its reading MPH using KM on the dials. Has to be a wire in wrong somewhere Edited January 5, 2015 by The Raven (see edit history) Quote Link to comment Share on other sites More sharing options...
bayside_supra Posted January 6, 2015 Author Share Posted January 6, 2015 Thanks for the advice. I will try and have another look tomorrow morning. However the car is going into Whifbitz tomorrow afternoon anyway so I may just get them to sort it out. I will try and have a look for the red wire and try and find the converter. Is it true that I should not need a converter at all with the 180 MPH Speedo? Or is it not as simple as that? Quote Link to comment Share on other sites More sharing options...
straightsix Posted January 6, 2015 Share Posted January 6, 2015 (edited) IIRC when I fitted genuine UK clocks, I did not need a converter. Are you sure someone hasn't just stuck a UK dial on a Jap cluster? EDIT: Ah - if they're UK clocks and you still have a converter you'll definitely need to remove it Edited January 6, 2015 by straightsix (see edit history) Quote Link to comment Share on other sites More sharing options...
bayside_supra Posted January 6, 2015 Author Share Posted January 6, 2015 If I can find the converter would it just be a case of cutting the wires attached to it? Or would I need to start reataching wires that might have been cut to fit the converter? Quote Link to comment Share on other sites More sharing options...
The Raven Posted January 6, 2015 Share Posted January 6, 2015 The back of the clocks will have screws with wires going into them if it has a converter. The stock car uses plugs at the top of the dials. Just seen your pic. I would let Whifbitz fix it. Do let us know what happened to it as it may help someone out Quote Link to comment Share on other sites More sharing options...
bayside_supra Posted January 6, 2015 Author Share Posted January 6, 2015 I might have to let Whifbitz sort as this is the back of my clocks, no screws with wires going into them! Quote Link to comment Share on other sites More sharing options...
The Raven Posted January 6, 2015 Share Posted January 6, 2015 Hmm its a really strange one isnt it. Im out of ideas so id be very interested to see what the issue is Quote Link to comment Share on other sites More sharing options...
bayside_supra Posted January 7, 2015 Author Share Posted January 7, 2015 Will find out soon enough! Quote Link to comment Share on other sites More sharing options...
bayside_supra Posted January 25, 2015 Author Share Posted January 25, 2015 Coming back to this, I have had the car back from Whifbitz and the issue is kind of sorted but not completely. So Whifbitz ordered a new speedo converter to try and get the speedo reading right, with this wired in it made no difference. I then asked if we can try disconnecting the converter, so this was done whilst leaving the delimit wires attached and success! The speedo started reading correct. After a few minutes of driving though my check engine light came on. This came up with fault code 42 which is speed sensor. So this is how my car is now, speedo works great but I have check engine light on! Whifbitz have said that I have the wrong speedo in my car (U.K. speedo in jap import) and the only cure for this is to get a jap spec speedo. Is there no way of making a U.K. speedo work in a jap spec car without it causing an engine light???? Has anyone had this issue and is another speedo my only option? Quote Link to comment Share on other sites More sharing options...
ScottC Posted January 25, 2015 Share Posted January 25, 2015 My Jspec is running a UK speedo just fine Quote Link to comment Share on other sites More sharing options...
bayside_supra Posted January 26, 2015 Author Share Posted January 26, 2015 So it is possible to use a UK speedo in my car then? Does this error code point to a wiring issue perhaps? Quote Link to comment Share on other sites More sharing options...
ScottC Posted January 26, 2015 Share Posted January 26, 2015 Quite a few members are running UK speedos in jspecs, it's simply plug and play and elimates the need for a converter. I would say the issue is somewhere else or you have a faulty speedo. Quote Link to comment Share on other sites More sharing options...
straightsix Posted January 26, 2015 Share Posted January 26, 2015 Mine was running a UK cluster with no issues - a UK cluster is plug and play in a J-Spec. Maybe try another cluster (if you could borrow one) or speed sensor. Something doesn't seem right though.... Quote Link to comment Share on other sites More sharing options...
bayside_supra Posted January 27, 2015 Author Share Posted January 27, 2015 OK atleast I know I do not have to find a Jap speedo now. I am in contact with Paul about it so hopefully we can try some other solutions. Thanks for the help and to be continued I guess! Quote Link to comment Share on other sites More sharing options...
Guest RichardRobinson Posted January 28, 2015 Share Posted January 28, 2015 If you are getting confused with wires, then put all the wires in their places with matching wires, and remove the extra one. Buy a new Speedo matter otherwise. Quote Link to comment Share on other sites More sharing options...
bayside_supra Posted February 21, 2015 Author Share Posted February 21, 2015 This has been sorted now, the half fitted converter must have been the problem. Whifbitz removed it and put all the wiring back to standard and seems all good now. Time will tell (only driven home) but it seems t just had an speedo convertor that was not needed before. Quote Link to comment Share on other sites More sharing options...
j_jza80 Posted February 21, 2015 Share Posted February 21, 2015 EDIT: Ah - if they're UK clocks and you still have a converter you'll definitely need to remove it I reckon that's the issue Quote Link to comment Share on other sites More sharing options...
Rwbjj Posted February 22, 2015 Share Posted February 22, 2015 This has been sorted now, the half fitted converter must have been the problem. Whifbitz removed it and put all the wiring back to standard and seems all good now. Time will tell (only driven home) but it seems t just had an speedo convertor that was not needed before. If you don't need the speed converter anymore, i'll happily take it off your hands for a few beers. Mine is reading KMS on a MPH scale as the old converter was removed and not replaced before i bought the car. Just one of the many little things on my list to sort out.... Cheers, Ben Quote Link to comment Share on other sites More sharing options...
bayside_supra Posted February 22, 2015 Author Share Posted February 22, 2015 Sent you a message Ben Quote Link to comment Share on other sites More sharing options...
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