Timlowthian Posted November 21, 2015 Share Posted November 21, 2015 So I have a 97 Supra which was a 5 speed NA but now has a TT engine installed. All was running great but now it is refusing to start. To start id like to confirm I have not FCD or Speedo converter on the car, these seem to be the common causes for the problems I'm having. I was running the Auto ECU the engine came with and was fine until one morning it started but then died immediately after. Didn't matter if you tried to hold the revs it still died as the revs just drop off. Checking the error codes I get 31 which is air flow sensor? Where is this as when you research online most of it is from the american forum talking about the AFM which I don't have on the JDM engine. Next I tried fitting a Manual TT ECU as I had read this helped someone with a similar problem. Now with this connected it does actually run and stay alive but it is VERYYY Lumpy it also now has more codes. The Error codes it has with this are 27, 31 and 35, now if I am not mistaken this is 27 - Sub Oxygen Sensor, 31- Air flow again and 35 - Turbo pressure sensor. Does anyone have any ideas at all what I should be looking at here? Its got to that point I'm almost ready to part it out. Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted November 21, 2015 Share Posted November 21, 2015 Have you got fuel pressure? Tried the fuel pump bypass? Quote Link to comment Share on other sites More sharing options...
Timlowthian Posted November 21, 2015 Author Share Posted November 21, 2015 It does have fuel pressure checked that but don't have a gauge to give an exact reading. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted November 21, 2015 Share Posted November 21, 2015 I suspect, unless it's a VVTi TT engine, or a Euro / US / UK spec TT engine, that the MAP sensor is either disconnected, connected poorly, or not getting a proper vacuum / pressure signal from the plenum. But as with all these sorts of faults, it's very hard to diagnose effectively from afar. You could look at the MAP sensor voltages referenced to engine ground at the ecu by CAREFULLY back probing the yellow / black wire with a half decent high input impedance digital multimeter. With the meter connected get someone to suck and blow down a hose connected directly to the MAP sensor port. From open to atmosphere the voltage should go up and down as they blow and suck respectively. One can make interesting new friends when asking for help in this regard. Quote Link to comment Share on other sites More sharing options...
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