Guest hoylegj Posted January 31, 2015 Share Posted January 31, 2015 Hi, Used the car to go to work, ran just fine, had not issues for years. Switched it off, came out 9 hours later, and it would not start, spins over, just checked the spark and have spark although wouldn't say its the best I've ever seen, checked two plugs and both sparked, checked the 2 ecu relays they are fine, checked all the fuse box fuses all good, jumped the diag socket in the car, no MIL light flash's at all(maybe doing that wrong), just off to lift the carpets and start digging around the ECU's and check the fuel pump haven't worked out the easiest way to do that yet. Anyone seen this before? all ideas welcome. Many Thanks Quote Link to comment Share on other sites More sharing options...
Scooter Posted January 31, 2015 Share Posted January 31, 2015 (edited) http://http://www.mkivsupra.net/vbb/showthread.php?234794-Fuel-Pump-ECU-Issue&highlight=Fuel+bridgeYou can check the fuel pump works by bridging two terminals in the diagnostic port using a metal paper clip. After that you may have a crank sensor problem? Edited January 31, 2015 by Scooter (see edit history) Quote Link to comment Share on other sites More sharing options...
Scott Posted January 31, 2015 Share Posted January 31, 2015 Would having a spark not suggest the crank sensor was OK? I thought faulty crank sensor meant no spark. First port of call is definitely the fuel if you already have the spark. Quote Link to comment Share on other sites More sharing options...
Scooter Posted January 31, 2015 Share Posted January 31, 2015 Good point! Quote Link to comment Share on other sites More sharing options...
safcdixon Posted January 31, 2015 Share Posted January 31, 2015 Not sure if you car is low but i had an issue last week, my car is very low at the front, I had melted through a very thick wire in the loom (luckily just one wire ) the car would turnover but wouldnt fire up. Quote Link to comment Share on other sites More sharing options...
Big Supes Posted January 31, 2015 Share Posted January 31, 2015 Would having a spark not suggest the crank sensor was OK? I thought faulty crank sensor meant no spark. First port of call is definitely the fuel if you already have the spark. Any fuel getting in? Were the spark plugs wet? Quote Link to comment Share on other sites More sharing options...
Guest hoylegj Posted January 31, 2015 Share Posted January 31, 2015 (edited) Thanks for the ideas, the latest.. Stripped the back end out, got to the fuel control box and the pump. Seems to be get over 18v+ Power in to the control box (not sure if my multi meter is playing up or that's real but don't understand that yet!!) Continuity of the wiring appears good, and if I jump 12v on to the pump the engine starts. So, its ether fuel control box or wiring. Will study the wiring diagrams to try and understand where the 18V is coming from and if there is a way to test the fuel pump control unit. Edited January 31, 2015 by hoylegj (see edit history) Quote Link to comment Share on other sites More sharing options...
safcdixon Posted January 31, 2015 Share Posted January 31, 2015 (edited) Theres a walkthrough of bypassing the fuel pump control on here, search 12v fuel pump mod Edit: not from here but might get you rolling if you need to wait for a new control unit http://mkiv.com/techarticles/12v_mod/12v_mod.htm Edited January 31, 2015 by safcdixon (see edit history) Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted January 31, 2015 Share Posted January 31, 2015 If you bypass the ECU and it starts, then thats your problem. Its not uncommon. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted January 31, 2015 Share Posted January 31, 2015 You have done a pretty easy spark test, to see if the engine is not getting fuel undo the banjo for the brake vacuum booster line on top of the plenum and spray some Easy Start or petrol into the plenum. Crank immediately and if it fires up for a few seconds then you need to see why the injectors aren't triggering properly, or the fuel to them is absent or too low a pressure. Quote Link to comment Share on other sites More sharing options...
Guest hoylegj Posted February 1, 2015 Share Posted February 1, 2015 Today we got a bit further, no volts at the fuel pump Ecu plug, fuses and relays good, 12 volts at the green connector in the passenger foot well. It's taken ages to get this far, and there is No continuity between the green socket and the pump connector. So next will be remove the junction box in the passenger foot well and see what's what. Quote Link to comment Share on other sites More sharing options...
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