Gareth Davies Posted October 28, 2002 Share Posted October 28, 2002 Hi guys, my Supras a bit ill at the moment... After starting it sounds very rough, and without some revs dies off immediatly. After it warmed up it was a little better but was definatly running very rich. We've been fiddling around and the fault code I get from the diagnostics is 31 (which is the MAF circuit), I presume it means a similar thing in a j-spec car (which uses a MAP system?). I don't have access to the engine manual or anything funky (is there an online one somewhere?), so could someone give me a hint were i'd find the sensor in the engine bay. And what colours the wires are for the ECU. I fear it can be one of two things thats killed it, the water inflow from the ab-flug bonnet (if it's exposed), or somethings gone wrong in my rats nest of wires down by the ECU. Neither being particulary good, and the local toyota people aren't exactly on my favourite persons list after royally f'in up my NA... With the greatest annoyance being it's died in Norwich rather than in MK where Leons like 4 miles away! Grr. Any help greatly appreciated. Quote Link to comment Share on other sites More sharing options...
adi Posted October 28, 2002 Share Posted October 28, 2002 The sensor should be on the bulkhead roughly in line with the inlet manifold. Little pipe going to it.. its only a little box about 1" square. Quote Link to comment Share on other sites More sharing options...
Ian C Posted October 29, 2002 Share Posted October 29, 2002 Gareth, MkIV.com have a large amount of info on the electrical system, namely the manual online, here. Pages 72 though 77 are the ECU circuit diagram, and you'll find the MAP/MAF/boost pressure sensors on page 74. The J-spec boost pressure sensor is here , it being the black thing with two bolts and the green sticker on. A small vacuum hose goes into it's underside, and a three-wire multiplug comes off it to the ECU. It's only bolted onto the manifold, nothing actually interfaces. Now, I don't know if this is classed as the MAP and used instead of the MAF on J-specs, or if the MAP is a different component somewhere else. Perhaps someone else can clear this one up And finally, search keywords in case anyone else needs this info - ECU wiring circuit diagram MAP MAF pressure sensor Hope this helps -Ian Quote Link to comment Share on other sites More sharing options...
Gareth Davies Posted October 29, 2002 Author Share Posted October 29, 2002 Awesome, thanks guys. That thing was making a very strange clicking noise so i'll bet that's our candidate. It's at Clive Attowes now so i'll pass that on so I hope he can find whats up. I'll bet toyota don't have one in the country though... I thought there was an electrical manual on MKIV.com. Couldn't find it though! Hmmm quick add to favourites. Thanks again. Quote Link to comment Share on other sites More sharing options...
Ian C Posted October 29, 2002 Share Posted October 29, 2002 It's just occurred to me that I might have a spare! I'll go and have a look right now... -Ian Quote Link to comment Share on other sites More sharing options...
Ian C Posted October 29, 2002 Share Posted October 29, 2002 How much do you like me, then? I've got a spare boost pressure sensor here if you want to borrow it, see if it gets you car going again! -Ian Quote Link to comment Share on other sites More sharing options...
Guest Martin F Posted October 31, 2002 Share Posted October 31, 2002 Originally posted by Ian C Now, I don't know if this is classed as the MAP and used instead of the MAF on J-specs, or if the MAP is a different component somewhere else. Perhaps someone else can clear this one up Not sure if this helps or confuses, but UK\US spec also have the same MAP sensor, as well as the MAF. Quote Link to comment Share on other sites More sharing options...
Gareth Davies Posted November 5, 2002 Author Share Posted November 5, 2002 Cheers for the help guys, turns out it is just my aweful wiring and nothing to do with the actual sensors. The one plus side is it was in the system the ECU said it was, so it proves the diagnostics are ok. Even on the funky mines unit. Quote Link to comment Share on other sites More sharing options...
Guest RaZerback121 Posted March 10, 2006 Share Posted March 10, 2006 Does anyone know what happens if you plug in a USDM ECU into a JDM motor? Is it worth the risk? Quote Link to comment Share on other sites More sharing options...
JohnK Posted March 10, 2006 Share Posted March 10, 2006 You cant, US has so many different things to a JDM car. MAF, differennt size and imperdance injectors, second O2 sensor.....ect. Its also becoming apparent that something on the ignition side is different too. Quote Link to comment Share on other sites More sharing options...
Guest RaZerback121 Posted March 10, 2006 Share Posted March 10, 2006 SOooo, i have the engine........and a 5 speed Tranny......all i need is a 6 speed JDM ECU? I might just go with a Aftermarket ECU. Only problem is the the wire harness was meant for an Auto, not a man.......we will see how that goes >_ Quote Link to comment Share on other sites More sharing options...
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