Ford EEC-IV No Start No Fuel Pressure Troubleshooting (Lincoln Towncar)

Ford EEC-IV No Start No Fuel Pressure Troubleshooting (Lincoln Towncar)

Description, operation and testing of the EEC main power relay, fuel pump relay and fuel pump circuit are covered in this video. Including engine computer inputs and what are needed to turn the pump on.
Interested in any of the tools I used? Check out my tools pages below: (uActivate is listed here) (test light and fuel psi gauges)

Video breakdown:
– using the check engine light as a guide 1:02
– fuel pressure test 3:20
– causes of no fuel pressure 4:32
– key on “prime” test of a fuel pump circuit 5:55
– broken power wire video 6:59
– fuel pump relay checks 7:55
– uActivate plug 8:12
– no spark video (Jake’s car) 9:07
– Bosch 4 and 5 pin relay pin designations and operation 9:58
– relay made noise when I touched it 10:44
– uActivate control side of a relay circuit testing 11:23
– uActivate load side of a relay testing 13:40
– EEC power and fuel pump relay wiring diagram, description and operation of the circuits 16:00 – 21:30
– testing fuses with a test light 22:06
– continued troubleshooting after fixing blown fuse to the power relay 25:50
– fuel pump current measurement, confirming open pump circuit with a test light 29:35
– pump diagram explaining why the test light should be lit when connected to battery positive on the pump feed wire 31:00
– loaded circuit power and ground testing of the fuel pump 32:49
– Hyundai fuel pump video mention where test light amperage was misleading 33:28
– why did the fuse blow for the EEC Power relay 39:34
– tracking the wiring harness for a short to ground 43:00
– new fuel pump is installed 47:15
– fuel pressure readings with new pump including vacuum assist fuel pressure regulator operation 49:07
– I made a huge mistake 57:14
– what battery positive through a test light looks like on a good fuel pump feed circuit (open circuit test) 58:01
– fuel pump current waveforms on a good fuel pump 1:00:00
– how to use a manual trigger mode on a lab scope 1:00:52

For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available at as an eBook or paper book.
Want even more diagnostic training? Whether you are a DIY trying to fix your own car, someone looking to become an auto technician, or a current auto technician that wants to get more into diagnostics, subscribe to ScannerDanner Premium There is a 14 day free trial.
On ScannerDanner Premium I will bring you right into my classroom at Rosedale Technical College. You will find page for page lectures taken right from my book as well as exclusive classroom type case studies. What is so special about these classroom case studies? I pull live problem vehicles directly into my classroom and we troubleshoot them in real time, using and applying the theory and testing procedures we learn during the classroom lectures. There is no better on-line training of how to troubleshoot automotive electrical and electronics systems anywhere!

Due to factors beyond the control of ScannerDanner LLC, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. ScannerDanner LLC assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. ScannerDanner LLC recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of ScannerDanner LLC, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not ScannerDanner LLC.



Bill Rimmer says:

Here is what I liked about the editing. When u referred to things in the original shoot, he put it in a box and showed us the event being refered to. Very nice. And that tool. U will sell a lot for AES wave. U have 130,000 subscribers that all want that tool. It's a great tool! U only promote good stuff that will help us. I'm sure with Caleb on board, u will be able to put more stuff on You Tube. I'm a premie too. But how many guys would love 130,000 subs!!

Alex Messina says:

Hey Paul, re initial turn on of pump wave form: what are you looking for in terms of height of the spike relative to normal average pump current, and how fast it steadies down to a normal current? Is this the same for a starter motor wave form?
thanks for the vid. Wish I could count how many times of done a fuse by poking wires and moving harnesses. HaHa 🙂

Gorge Leban says:

Thanks for you, and thanks for them

Ron Przybyszewski says:

Whats up danner iam some what new to ur channel infact about a month new just wanna give a big thanks ur videos are super informative infact i wanna say i gained more then i think i would have coming out of a 4 yr college!

Luis Feliciano says:

Excellent job and video !

Lee Rattle says:

Hi guys, Great Vid, Even the master can cause more issues 🙂 Hey Caleb you should be askin for wage review after the addition work .lol

Steve Ashcroft says:

Another good video Paul. I just wonder what is the point in a relay test tool that doesn't do a full test. IE the N.C. contact? Granted mostly diagnostics will be a 4 pin relay, but……

Mustapha Taleb says:

Good job paul. Many lessons learned from this case . Thanks again for efforts

Simply Diagnostics says:

Great video Paul, when I need a guaranteed power and gnd for my testlight I use the lead from my PP3 and my SnapOn testlight EECT313A00 which has a 4mm banana jack each end. It draws 440mA but sadly Snap-on don’t sell it anymore.

drejkee says:

if evolution is true generations of mechanics will grow a third hand 😀

Al Bore says:

Thanks again for your great videos SD ! They show how hard you work to make them possible., You even have the hands of a hard worker to prove it !
The fuse you blew is on a terminal that may have backed out of the relay socket box that you were testing. The wiring harness female terminals are pressed in to the relay box and are kept in place by a small tab on the connector that makes it press in but not allow it to pull out when the relay box wires are made up at the factory. If you pull relays out and press them back in that movement may have made that female connector move enough to expose the end where the wire is crimped in place. These female connectors have been known to move outward when components are installed and only make a partial connection to those components.
Seen it, Fixed it !

taledarkside says:

not sure if you got into it, but a lot of the fords in the 80s-90s had the stupid inertia switch with that eec4 system

taledarkside says:

yup, lets be safe and not get your car on fire like that etcg

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