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Thread: Using P8 ECU on P7 ECU Loom

  1. #1
    Join Date
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    Default Using P8 ECU on P7 ECU Loom

    Am i missing a trick here.

    I am using a P8 ECU on a P7 -SP4 loom.
    I have been assured that a direct swap is fine but any other thoughts on this?

    Thanks

    Guy851

  2. #2
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    Default

    I had once a 888 SP5 ECU in my bike witch i belive to be a 93 strada. I belive this might work ok but is better to wait for more reliable ansers.
    Sorry cant help more

    Cheers

  3. #3
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    Default

    I am using a P8 with an 851 P7 loom. No problems.
    Whats going on here mate, this seems to be doing your head in.
    Lets list the knowns and the unknowns.
    1.The loom is unknown.
    2.The relays are known, new and working.
    3. Known. The plugs are all good and not corroded, burnt or damaged.
    4. Known. The pump fires.
    What else?
    Need to use a bit S.Holmes logic.

    Griff

  4. #4
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    Default

    Have you got these? They will help when doing the broken wire chase if it comes to that.

    Griff

    PS this ECU wire diagm is for a Guzzi and I have a Guzzi P8 and it works. The other is from 888 manual which includes SP5
    Last edited by griff851; 03-09-2009 at 07:40 AM.

  5. #5
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    Default Wiring diagrams

    Thanks for the two drawings I will print up nice and big later.

    What we have is

    this seems to be doing your head in - True
    Lets list the knowns and the unknowns.
    1.The loom is unknown - Known s/h SP4 loom
    2.The relays are known, new and working - Known new and working
    3. Known. The plugs are all good and not corroded, burnt or damaged - Known all connectors are nice
    4. Known. The pump fires - Not true
    5. All the rest of the system is fine, switchgear all fine and working
    6. Just that there is no power to the second relay and it is not getting a signal from the ECU to latch the relay - hence no fuel pump
    7. Looking deeper at the ECU and eprom with kind help from MikeSPS

    What else?
    Need to use a bit S.Holmes logic.

    Griff[/QUOTE]

  6. #6
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    yorkshire
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    Default

    guy would the loan of my ecu help ?

    spike

  7. #7
    Join Date
    Aug 2007
    Location
    Sweden
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    157

    Wink Hmmmm....

    Just a little odd fact:

    MyECU has one unit as replacement f WM P7 & P8.
    So, the P8 should work.

    But,
    P7 Eproms don`t work in P8.
    P8 has an offset map f rear cyl, P7 hasn`t.

    Dunno if this helps, just wanted to chime in after 5 beers...

  8. #8
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    Jun 2007
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    Temecula, Calif
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    Default

    I have a P8 on my 1990 851, it came OEM with a P7. I sourced my P8 from a 1998 Laverda 668 Ghost

  9. #9
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    Guy take up spike on his offer. Quick and easy way to source a component problem is to replace it. Then if it is the ECU you can deal with it. I lend out my P7 for fault finding. Have you checked the loom for continuity between ecu plug and relay. The loom may look in good nick, unfortunately shit happens,so you might as well check, while waiting for spike to rock up.

    Griff

  10. #10
    Join Date
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    Default Cheers all

    MikeSPS is kindly sending a P8 and working chip for testing
    I have also ordered another eprom to suit the build + the 50mm spag system and no air filters from JHP

    So by the weekend I will be overrun with ECU's and chips

    Fingers very crosst

    Guy851

    Quote Originally Posted by griff851 View Post
    Guy take up spike on his offer. Quick and easy way to source a component problem is to replace it. Then if it is the ECU you can deal with it. I lend out my P7 for fault finding. Have you checked the loom for continuity between ecu plug and relay. The loom may look in good nick, unfortunately shit happens,so you might as well check, while waiting for spike to rock up.

    Griff

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