Fuel Pump not priming - immobiliser dash light flashing

  1. Newbie Joined: Mar 2005 Posts: 27
    #1
    fuel pump not priming - after long period of being out of use and new engine fitted

    I conencted my battery up late last night after carrying out a jp4 conversion, purely to turn the engine
    over via the starter motor with the coil pack disconnected, and to check the fuel pump is priming / pressuring the fuel rail.
    unfortunately the fuel pump will not prime and the immobiliser light is repeatedly flashing. The starter does however turn the engine.

    some background info

    car is 2003 3 plug VTS, all the loom, ecu, sensors etc are orginal and worked prior to the conversion,
    ecu has been dry stored for maybe a year, should not have gotten damaged.
    the ecu dashboard light comes on then extinguishes a few seconds later when i turn ignition on
    remote central locking and alarm works via the key fob
    all external lights work on vehicle and the stereo powers up and asks for code but heater blowers will not come on


    I am aware there are some checks i can maybe do

    press inertia switch
    check relay wiring / functionality under ecu
    check all fuses, or in particualr some select fuses?? under dash? in engine bay?
    check all earth connections for good continuity with DVM
    check all other electrical connections are made properly as best as practical


    some questions I have

    is the ecu pairing memory volatile or is it flashed to an eprom or something?
    is the transponder pickup ring fused /or powered by a relay
    how can i test the relay under ECU

    finally does anyone have any logical ideas how to best tackle this problem before escalating/ spending unneccesary money


    Thanks in advance
  2. Newbie Joined: Jul 2013 Essex Posts: 1 Saxo vtr x3
    #2
    U alright mate just run a live from the battery to the fuel pump then it should start
  3. Saxperience Hardcore! Joined: Dec 2007 smurfland. Posts: 17346 Ex saxo owner.
    #3
    You`ve locked the ecu,which is why the light is flashing & the pump isn`t priming.
  4. Saxperience Hardcore! Joined: Mar 2008 Posts: 31279 Citroen Saxo VTS, S60 D5
    #4
    As above.
  5. Newbie Joined: Mar 2005 Posts: 27
    #5
    ok cheers, thanks for the replies

    what implications does that have then? when you say I have locked it, by not using it for so long would that lock it? and does this mean my keys are no good, or it just needs some kind of unlock on the unit only or is it anyones guess

    just want to make my first go at fixing it stand to a good chance of getting it working.

    ta
  6. Saxperience Post Whore Joined: Nov 2010 Kent Posts: 8439 Gen 7 Celica 190.
    #6
    Have you used the same key ECU & Immo before like had the car running?
  7. Newbie Joined: Mar 2005 Posts: 27
    #7
    yes,

    I bought the car as a fully working 03 VTS, because Im a sad git I have taken it apart and replaced almost everything on the car that can wear out over the last year, including a low mileage JP4, painted various bits and under sealed etc etc

    Now my work is almost finsihed and the bugger wont work!

    but all the wiring, ecu, keys, everything is original, and did work when I started out, like I say its just been sat ages, and I was careful as I suppose I could have been with all the wiring
  8. Saxperience Post Whore Joined: Nov 2010 Kent Posts: 8439 Gen 7 Celica 190.
    #8
    It will be a earth somewhere, check the gearbox both the earths on?

    Dont let anyone tell you the ECU is locked because it not. As soon as you fine the earth or connector not plugged in it will fire up.
  9. Newbie Joined: Mar 2005 Posts: 27
    #9
    ok cheers,

    Before I do anything hasty I'll check over all the wiring, I have already checked the gearbox, it has the two green earths on the same lug at the top, and the larger individual one further toward the back.
    ill see if theres any sensors without a home, although i'm fairly confident its all on im hoping something isn't for an easy fix!
  10. Newbie Joined: Mar 2005 Posts: 27
    #10
    Well Cam, you the man!

    Went over every wire inspecting and gave a little tensile test tug, crack, the smaller of the two lugs on the big bolt on the starter motor came off, a thick black wire that goes into the loom

    after being the most awkard piece of wire to repair/extend/tighten up ever
    I turned to first notch on ignition and immobiliser cleared, fuel primed , Turned key a little further and after about 5 seconds of chugging and spluttering my shiney JP4 sprung to life then ran like a fekkin dream!!

    felt goog cos this puppies been on axle stands seemingly forever

    thanks all for suggestions
  11. Saxperience Post Whore Joined: Nov 2010 Kent Posts: 8439 Gen 7 Celica 190.
    #11
    Glad I could help