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What causes the pcm relay to buzz on a 2000 ford ranger xlt 2.5

amandaandearlamandaandearl Member Posts: 4
edited May 2017 in Ford
My ford ranger won't start it will turn over,it had a buzzing/humming sound coming from a relay in the fuse panel
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  • amandaandearlamandaandearl Member Posts: 4
    Its not Firring and its not running my fuel pump please help
  • amandaandearlamandaandearl Member Posts: 4
    Please anyone. Need help. Idk what to do.  Please I just need a few min of y'all time thanks

  • PF_FlyerPF_Flyer Member Posts: 9,372
    From a quick Google search for people having similar issues, you might have a short in the wiring to ground on the secondary side of the relay (non-battery +12v side).

    The relay energizes, causes the short, the short cause the drop in available voltage so the relay kicks out. Now that the relay has kicked out, there is power to energize it again, so it does and in doing so brings the short back into play starting the cycle all over again.
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