engine wont start , ecu problem?

  1. L-plater Joined: Apr 2012 Basingstoke Posts: 89 Citroen Saxo Blue 2003
    #1
    hi all,
    bought an engine from a friend who unlocked the ecu by taking the imobiliser out when running, after putting it in it didnt work, it was sent of to blue hawk electronics to be wiped, when i got it back the fuel pump still doesnt prime, and the imobiliser light is still flashing - i didnt think it would with the ecu being unlocked? anyways i took the imobilser out which stopped the flashing. could i have locked my ecu again or would it have been permanelty unlocked? none the less fuel pump still not priming and engine wont start.
    i am not sure how to test the fuel pump to see if its getting power, i have a multimeter but not suure which wire is the live?
    could it be a dodgy earth somewhere?
    anyone have any ideas im nearly there
  2. L-plater Joined: Apr 2012 Basingstoke Posts: 89 Citroen Saxo Blue 2003
    #2
    oh also forgot checked fuse 9 for the fuel pump it seemed fine.
    where is its relay, could it be that?
  3. Infrequent Poster Joined: Sep 2014 Posts: 215
    #3
    Does fuse 9 still have power when the engine is cranked?
    Power goes from the injection relay to fuse 9 to the fuel pump.
    The fuel pump may still prime when the key is turned on when the car is imobilised but no power when cranked.
  4. Saxperience Forum Bum Joined: Apr 2013 Jarrow Posts: 4022 2003 Icelandic Grey 16v VTR 1991 Daihatsu GTti
    #4
    Did you take the immobiliser unit out if your car when you fitted the new ECU?
  5. Regular Poster Joined: Aug 2013 Iceland Posts: 277 Citroën Saxo VTS (build in progress.)
    #5
    I had the same problem check the wires on the starter because if they are doggy it will flash the immo light and wont prime.
  6. L-plater Joined: Apr 2012 Basingstoke Posts: 89 Citroen Saxo Blue 2003
    #6
    i didnt remove it after it was sent back - as i didnt think i would need to. i dont think i could have locked it again as surely after £85 it would be permanetly unlocked.
    and thanks laurynas i will try that tomorrow.
    and i will check the fuse
  7. Saxperience Forum Bum Joined: Apr 2013 Jarrow Posts: 4022 2003 Icelandic Grey 16v VTR 1991 Daihatsu GTti
    #7
    Only wont re-lock if the pins been removed.
  8. L-plater Joined: Apr 2012 Basingstoke Posts: 89 Citroen Saxo Blue 2003
    #8
    it was sent of to blue hawk to be unlocked so is that what your saying? thats surely what they would have done?
  9. Established Member Joined: Jan 2013 Portsmouth Posts: 1335 1997 Mk1 VTS
    #9
    Probably not. You need to remove the immobiliser, its a two second job.
  10. L-plater Joined: Apr 2012 Basingstoke Posts: 89 Citroen Saxo Blue 2003
    #10
    yeah its out
  11. L-plater Joined: Apr 2012 Basingstoke Posts: 89 Citroen Saxo Blue 2003
    #11
    Okay. Rookie mistake, never plugged in the cut off switch. So I've now managed to get the fuel pump to prime but still not starting. If it's priming would that mean the ecu is unlocked ?? And what else can I check??
  12. Saxperience Post Whore Joined: Jul 2011 Newcastle upon Tyne Posts: 7779 Phase 2 VTS , E61 M5
    #12
    Quote:
    Originally Posted by CALLUMSAMUELS View Post
    Okay. Rookie mistake, never plugged in the cut off switch. So I've now managed to get the fuel pump to prime but still not starting. If it's priming would that mean the ecu is unlocked ?? And what else can I check??
    I had something similar, the pump primed, it turned over but wouldn't start.

    I spent 2 weeks changing sensors, in the end I bought an OBD thing from ebay, cleared the faults and it started straight up.

    Worth a shot?
  13. L-plater Joined: Apr 2012 Basingstoke Posts: 89 Citroen Saxo Blue 2003
    #13
    Obd thing???
  14. Saxperience Post Whore Joined: Jul 2011 Newcastle upon Tyne Posts: 7779 Phase 2 VTS , E61 M5
    #14
    Quote:
    Originally Posted by CALLUMSAMUELS View Post
    Obd thing???
    The diagnostic port under the glovebox

    you can get the thing to plug it into your laptop for about a fiver
  15. L-plater Joined: Apr 2012 Basingstoke Posts: 89 Citroen Saxo Blue 2003
    #15
    Okay. Thanks a lot for your advice I will look into it. Anything I can check over before that?
  16. Saxperience Post Whore Joined: Jul 2011 Newcastle upon Tyne Posts: 7779 Phase 2 VTS , E61 M5
    #16
    I'd start there, I'm sure a pal has one, they're not car specific
  17. L-plater Joined: Apr 2012 Basingstoke Posts: 89 Citroen Saxo Blue 2003
    #17
    Okay I got it started!!! Sooooo happy. Basically I had the front jacked up and because there was little amount of fuel the fuel pump couldn't pick any up. It's started now and oh my does it sound good.
  18. Saxperience Post Whore Joined: Jul 2011 Newcastle upon Tyne Posts: 7779 Phase 2 VTS , E61 M5
    #18
    Really? lol
  19. Super Moderator Joined: Nov 2009 Cambridge(ish), UK. Posts: 10581 BMW 5x M50d.
    #19
    Quote:
    Originally Posted by CALLUMSAMUELS View Post
    Okay I got it started!!! Sooooo happy. Basically I had the front jacked up and because there was little amount of fuel the fuel pump couldn't pick any up. It's started now and oh my does it sound good.
  20. L-plater Joined: Apr 2012 Basingstoke Posts: 89 Citroen Saxo Blue 2003
    #20
    Yeah yeah whatever lol.
  21. Established Member Joined: Jan 2013 Portsmouth Posts: 1335 1997 Mk1 VTS
    #21
    Glad you got it running pal. Always sounded nice when I owned it. Get some pictures up!
  22. Saxperience Post Whore Joined: Nov 2010 Kent Posts: 8439 Gen 7 Celica 190.
    #22
    Quote:
    Originally Posted by CALLUMSAMUELS View Post
    Okay I got it started!!! Sooooo happy. Basically I had the front jacked up and because there was little amount of fuel the fuel pump couldn't pick any up. It's started now and oh my does it sound good.