dive_popo Posted August 12, 2013 Share Posted August 12, 2013 (edited) Hi guys. I have recently an issue with my Supra. I drove it and parked for 2h. Then it refused to start. The supra is a JDM TT BPU auto, with a mines ecu I checked the following : -fuel is arriving -battery OK -starter ok -no engine codes -there is no ignition at all -plugs and coil connectors are new (changed last year and the car done maybe 200miles since) -sometimes there is an electrical weird issue : i take off the key but the + after contact stays on(no lights on the board but the fuel pump continues to turn and the AVCR stays ON) (no turbo timer in car) I need to unplug the battery to stop it. Any help will be much appreciated (I had a similar issue 1 and a half year ago, but I bought an electrical connector cleaner and put abso;lutely on all possible plugs I saw, and it started, I done the same now but didn't helped this time) Edited August 12, 2013 by dive_popo (see edit history) Quote Link to comment Share on other sites More sharing options...
dive_popo Posted August 12, 2013 Author Share Posted August 12, 2013 Checked also the main relays and they are fine. Quote Link to comment Share on other sites More sharing options...
mellonman Posted August 12, 2013 Share Posted August 12, 2013 maybe i dodgy efi relay that would explain the keeping running issue and maybe the starting if the cotacts are totally shot now Quote Link to comment Share on other sites More sharing options...
mellonman Posted August 12, 2013 Share Posted August 12, 2013 how have you checked the relays? with a meter Quote Link to comment Share on other sites More sharing options...
dive_popo Posted August 12, 2013 Author Share Posted August 12, 2013 I checked with the meter, and they all click. Also as there are 4 identical I tried to interchange them. Quote Link to comment Share on other sites More sharing options...
stevie_b Posted August 12, 2013 Share Posted August 12, 2013 How do you know the starter motor is OK? What tests have you done? Quote Link to comment Share on other sites More sharing options...
dive_popo Posted August 12, 2013 Author Share Posted August 12, 2013 Because it is turning the engine, but as there is no ignition it is not starting Quote Link to comment Share on other sites More sharing options...
dive_popo Posted August 12, 2013 Author Share Posted August 12, 2013 If the starter was gone, it would turn in the air or either not turn at all. Quote Link to comment Share on other sites More sharing options...
dive_popo Posted August 13, 2013 Author Share Posted August 13, 2013 Nobody has an idea ? Quote Link to comment Share on other sites More sharing options...
HadeS Posted August 13, 2013 Share Posted August 13, 2013 Can you take one of the coil with the spark plug and see is there a spark while cranking the engine? Quote Link to comment Share on other sites More sharing options...
mellonman Posted August 13, 2013 Share Posted August 13, 2013 also do you have an alarm / imobiliser Quote Link to comment Share on other sites More sharing options...
fastcar Posted August 13, 2013 Share Posted August 13, 2013 Have you checked the igniter box it's the most comon issue I can think of Quote Link to comment Share on other sites More sharing options...
Mk4Gaz Posted August 13, 2013 Share Posted August 13, 2013 also do you have an alarm / imobiliser My thoughts.......... Quote Link to comment Share on other sites More sharing options...
SPG Posted August 13, 2013 Share Posted August 13, 2013 Sounds like the time my MINES ECU blew a fuse Quote Link to comment Share on other sites More sharing options...
Ian C Posted August 15, 2013 Share Posted August 15, 2013 You'll need to get familiar with a multimeter, the ECU pinouts, and a nice pin probe to check the wires right at the ECU plug. See if it's trying to trigger a spark. If so, check at the igniter, see if that's sending the spark to the coils. Check at the coil pack plug, see if the signals are reaching there. At some point, if all six packs aren't sparking, you'll find a single point of failure, either a voltage feed, a fuse, or an earth. Quote Link to comment Share on other sites More sharing options...
Ian C Posted August 15, 2013 Share Posted August 15, 2013 (edited) For example, check earth point EC, front side of intake manifold, lower runners. Seeing as you've got that strange electrical thing where the fuel pump stays on, my money is on a dodgy earth. Perhaps the bolt has fallen out, happened to me once and took a week to diagnose. Edited August 15, 2013 by Ian C (see edit history) Quote Link to comment Share on other sites More sharing options...
dive_popo Posted August 18, 2013 Author Share Posted August 18, 2013 Thanks guys I took all coils out and there is no spark at all, not even one :/ Ian could you show me on a picture where this earth is please I remember last year when I got the same issue is touched absolutely everything on the intake manifold and it started then the issue disapeard, It might be this ! Quote Link to comment Share on other sites More sharing options...
dive_popo Posted August 18, 2013 Author Share Posted August 18, 2013 I am aslo thinking on a stupid thing like a doggy earth, i use the car maybe once in a month There is no alarm / immobilizer in the car Quote Link to comment Share on other sites More sharing options...
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