ECU & "engine running" signal question

Discussion in 'General Motoring' started by TeGGer®, Feb 5, 2005.

  1. TeGGer®

    TeGGer® Guest

    How does the ECU know the engine's running? Does it use an alternator
    output signal, or does it use the RPM pickup in the distributor?

    Also, what's the purpose of the Starter Signal as used by the EFI main
    relay? Is it only to energize the fuel pump relay while the engine's
    cranking?
     
    TeGGer®, Feb 5, 2005
    #1
  2. TeGGer®

    Mista Bone Guest

    Crank postion sensor in the distributor

    yes
     
    Mista Bone, Feb 5, 2005
    #2
  3. TeGGer®

    TeGGer® Guest


    So the if the RPMs are above a certain amount, the ECU considers that the
    engine is running?

    I ask because obviously the crank angle sensor would be registering
    movement even during starter operation.
     
    TeGGer®, Feb 5, 2005
    #3
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