2004 Ford F550 No Communication with PCM

This Video also includes
2004 FORD F550 brake pressure switch location
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[@1s.s.hotrodvair]

Thanks for being so thorough in your analysis!

[@DallasAutoDiag]

Thank you

[@nickayivor8432]

My Mentor Dallas Auto Diag
Thank you very much for sharing what you know with us Take care and have a great weekend with all your family around you
ACCOMPLISHED Dallas Auto Diag
From Nick Ayivor from London England UK 🇬🇧

[@DallasAutoDiag]

thanks

[@advancedleveldiagnostics]

Great Video! I don't under stand why a shorted driver in the pcm would blow the fuse, wouldn't it just cause the valve to remain open? unless the valve is shorted also?

[@DallasAutoDiag]

The valve is not shorted. Near the end ai disconnect both pcm harnesses and check for short to ground. It wasn't there.

[@advancedleveldiagnostics]

@@DallasAutoDiag So then what is blowing the fuse, how's the power getting to the shorted driver?

[@advancedleveldiagnostics]

oh just realized Its probably never a full ground must be PWM or something like that, and the amps of a full ground is to many.

[@DallasAutoDiag]

@@advancedleveldiagnostics fuse holder had one side power and other side ground. Ground side should not be ground.

[@advancedleveldiagnostics]

@@DallasAutoDiag with the pcm disconnected you still saw ground on the other side of fuse? Anyways ground has to be coming from pcm going thru the valve.

[@doncookbc]

Thank you very Much !!!

[@DallasAutoDiag]

Thanks

[@danman9017]

good one thanks

[@DallasAutoDiag]

Thanks Dan

[@ebrahimsadeghi5883]

Awesome 👏

[@DallasAutoDiag]

Thanks

[@prashanshan7125]

Hi because ECU was providing constant gnd to that value. wasn't that valve burnt..?

[@DallasAutoDiag]

I don't think so because the fuse was the protection of the circuit

[@prashanshan7125]

@@DallasAutoDiag oh forgot about the fuse..

[@k.mohammadmifthahulislamzi7330]

What Was the problem customer Facing with this Truck
before you diagnosing??? 💚💚

[@DallasAutoDiag]

it doesn't crank

[@ronkarns5368]

Did you not notice that each component has resistance just built into it the way you tested it is completely wrong

[@DallasAutoDiag]

Can you specify which part of the video and elaborate more?

[@philh9238]

Cut the wire at the pcm to see if it’s pcm or valve

[@DallasAutoDiag]

I should have done that. Just did not want to show bad practice on camera.

[@gazmendhajra1957]

old truck wiers hanging. One problem down few more to go once driven.

[@DallasAutoDiag]

Agree

[@nickayivor8432]

Questions time what do you call SUBSTANTIAL AND PROFICIENT AND PRODIGY AND INTELLECTUAL AND ACCOMPLISHED ADD ONE MORE KNOWLEDGEABLE THE ANSWER IS
DALLAS AUTO DIAG
MY MENTOR DALLAS AUTO DIAG
👍
From Nick Ayivor from London England UK 🇬🇧

[@DallasAutoDiag]

I don't deserve all that. thanks mate

[@doncookbc]

what kind of tester is that the one that screams lol

[@DallasAutoDiag]

Power probe