S50B32 + piggyback = injector faults ... Resistor details?????

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  1. S50B32 + piggyback = injector faults ... Resistor details????? 
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    BMW M3 E36 S50B32 fitted the AEM FIC8 piggyback - all fine except I need to resolve the usual injector faults problem... Does anyone know what resistors are needed for this fix?

    Thanks for the help!
    Last edited by Will_UK_74; 12-08-2012 at 22:21.
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    What do you need to do? Just place resistors instead of the original injectors and the Piggyback connects to and drives them instead?
     
     

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    I have intercepted the injector signals with the FIC as per the schematic, which should allow for changing the fueling curves...

    On top of this I have faults on only 5 out of the 6 injectors.
    Can the Siemens ecu be that sensitive??

    I thought it may be an issue with the response time but no joy there.

    Am out of ideas soon...
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    Possibly.
    I think it has figured out it isn't in control of the injectors. If it is purely down to resistance, you can measure the impedance of an injector, then measure it at the loom with the piggy back included and see if there is a difference there.

    Do you know any of the code numbers from the faults?
     
     

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    Thanks for the reply mate.


    I read these codes about 10 minutes ago.

    Here are the codes - interesting they're only on cyls 1 - 2 - 3 and 4...

    I am guessing that they come up following the firing order and then when the engine runs its does not need to kick out for cyls 5 and 6??


    Earlier fault logs show the errors at different rpms.

    Thanks for the help.

    Will

    3 Injector valve 1
    Error frequency : 1
    Engine speed 160.00 rpm
    Load signal 2.78 ms
    Battery voltage HR 10.60 V
    injection time 1 11.52 ms
    Betriebstundenzaehler 0.40 h
    Hexcode=0374013204576A2D50 0.00 [HEX]
    lead braking / value missing
    exhaust fumes relevant error
    error after debouncing stored
    Error present
    Static error
    -------------------------------------------------------------

    5 Injector valve 2
    Error frequency : 1
    Engine speed 160.00 rpm
    Load signal 2.78 ms
    Battery voltage HR 10.60 V
    injection time 2 11.52 ms
    Betriebstundenzaehler 0.40 h
    Hexcode=0574013204576A2D50 0.00 [HEX]
    lead braking / value missing
    exhaust fumes relevant error
    error after debouncing stored
    Error present
    Static error

    -------------------------------------------------------------
    4 Injector valve 3
    Error frequency : 1
    Engine speed 160.00 rpm
    Load signal 2.78 ms
    Battery voltage HR 10.60 V
    injection time 3 11.52 ms
    Betriebstundenzaehler 0.40 h
    Hexcode=0474013204576A2D50 0.00 [HEX]
    lead braking / value missing
    exhaust fumes relevant error
    error after debouncing stored
    Error present
    Static error
    -------------------------------------------------------------
    33 Injector valve 4
    Error frequency : 1
    Engine speed 1000.00 rpm
    Load signal 1.34 ms
    Battery voltage HR 12.60 V
    injection time 4 4.61 ms
    Betriebstundenzaehler 0.10 h
    Hexcode=21740132192A7E1250 0.00 [HEX]
    lead braking / value missing
    exhaust fumes relevant error
    error after debouncing stored
    Error present
    Static error
    ================================================== ===========
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    Hmm, OK, it's got them pretty quick, at low revs, so it is obvious to the ECU that something is up, but unfortunately the codes aren't able to give a full description.

    Older 8bit ECUs only had slots for 255 different possible errors, so anything it can't go in to too much detail on the exact cause.
     
     

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    TheEnd - I get what you meant in your first post!!


    The FIC drives the injectors...and no longer the Siemens ECU...

    So no current/ open circuit (signal to the FIC only) so the ECU assumes there are problems with the injectors or supplies...


    So the solution may be to fit resistors between the ECU Signal and Ground wires to simulate an 'injector'.
    The fic then takes care of itself and the actual injectors...

    I'll order the resistors 16ohms...25W enough?

    Thank you for your help mate.
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    Riiiight!

    Now we're getting somewhere!

    You should be OK with them, I've got it listed as 15.9 Ohms. I'm not sure of the power, but I = V/R, so they are about 1 watt each.
     
     

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