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RPM LOST ON IGNITION CHECK

in 912 / 914 Technical Questions 7 years ago

  • Re: RPM LOST ON IGNITION CHECK

    by » 7 years ago

    Hi Kevin,
    "My ignition modules have Ducati embossed on the outside of the cases"

    How old is your engine?

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell

      
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  • Re: RPM LOST ON IGNITION CHECK

    by » 7 years ago

    Roger, It's the new model, 2009.

    Kevin, following is what I have done :
    Ignition key on # 1 (module A) =800 RPM drop. Ignition key on # 2 (module B) = Ok
    I swapped the connectors at the modules :
    Ignition key on # 1 = OK, ignition key on # 2 = 800 RPM drop.

    Refer to what you said, I understood that the problem is the circuit and not the module ! Would you please confirm ?
      
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  • Re: RPM LOST ON IGNITION CHECK

    by » 7 years ago

    In answer to Roger, it is a 2003 912UL with the 4 pin plug and bullet connectors.

    I don't have a key switch ignition in my aircraft, I have 2 separate switches so I cannot tell you which circuit is on in which key position. You can easily measure the kill wire connection resistance to ground whilst operating the key. The heavy maintenance manual has a wiring diagram.

    From what you have just written then yes, I would agree that the fault lies in the wiring or engine side components and not the module.

    Kevin
      
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  • Re: RPM LOST ON IGNITION CHECK

    by » 7 years ago

    Old ignition modules cases used to have Ducati embossed on them, but different internals were from Rotax. Now they don't have Ducati embossed on them any more.
    Your problem is before the modules. Check the wires feeding into the pin connectors, ohm these wires from the back of the engine out.


    Diagnostics. Heavy Maint. Manual. Section 74-00-00 page 22
    3.12) Measurement values for the ignition unit
    The following measurement values can be checked at the appropriate point after
    detaching the plug connections.
    Generator coil
    (on stator) yellow - yellow 0.1 to 0.8 Ω
    Generator coil yellow - ground ∞
    Charging coil (on stator) red - ground 3.2 to 4.5 Ω
    Trigger coil green/white - blue/yellow 115.0 to 123.0 Ω
    Trigger coil new *
    (with clamps) white/yellow - blue/yellow 220.0 to 250.0 Ω
    Primary ignition coil connection contact - ground 0.1 to 0.4 Ω
    Secondary ignition coil high voltage - High v. 6.1 to 6.7 kΩ
    Spark plug connector 4.4 to 6.0 kΩ

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell

    Thank you said by: RotaxOwner Admin
      
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  • Re: RPM LOST ON IGNITION CHECK

    by » 7 years ago

    Thank you Roger, I keep you inform with the result.
      
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