Question about 2001 Ford Expedition

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01 ford expedition diagnostic plug in

Hello, i have been having a problem with my truck diagnostic plug in under the dash. I was told it doesnt work and they cant read the computer. I took it to a auto shop and they checked all the fuse's and said that they are all good. they refered me to ford, which costs a fortune. any ideas on why else the diagnostic plug could not work?

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The data link gets it's power from the fuse that also powers the cig. lighter,is the cig. lighter working?
If not check fuse no.3 (20amp) in the interior fuse panel.

We have seen on some occasions that some scan tools just will not link up for some reason. We have had several vehicles that customer went to have their state inspections done and the tester at that shop would not link up.We hook our ford diagnostic tester to it and it links right up,we then hook them to our inspection machine(which is not ford equipment) and they link right up to it.

Posted on Feb 27, 2009


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Do you have a check engine light blinking when this problem occurs? I assume you do because if it is missing and sputtering like you say the engine control computer would detect that and turn on the check engine light. Next step is to have the systems fault codes read through the diagnostic port under the dash in front of the driver, Autozone and others does this test for free.

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Thanks for choosing Fixya!

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Looking for torg specs on tire lug nuts on a 15passenger van f350

Hello there
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Make/Model Description Years Torque Make/Model Description Years Torque
FORD (continued)
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Heated seats not working.

You should start by checking your fuses under the dash. Should be a small panel under the dash or on the side of it. The panel has a legend which shows the position and title of each fuse.

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Dear Heater Core Hunter,
For your 01 expedition, that has the 5.4 liter motor in it, the heater core is located in the evaporator case assembly, where the blowermotor itself is located,This is a pretty darn good labor intensive job, if you open the passenger front door and get down onyour knees and look up underneath the dash.....that's what you're going to be removing and replacing, the heater core is inside of this black case.Please get back to me if you have any more questions...I'M HERE TO HELP!!!

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For the interior lights the door adjar switches in the door send a signal to the GEM module.It then grounds the coil side of the interior lamp relay. The switch on the dash that you turn on manually also grounds the coil side of the interior lamp relay so that would mean that everyrhing after the GEM is ok.Are the lights not turning on from any door including the deck lid? If not then problem would have to be in the GEM module.

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Vacuum Reservoir Removal and Installation
  1. Remove the battery and battery tray. For additional information, refer to Section 414-01 .
  1. Disconnect the vacuum hose and remove the vacuum reservoir.
  1. To install, reverse the removal procedure.


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1 Answer

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