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:
https://www.scannerdanner.com/tools.html (uActivate is listed here)
https://www.amazon.com/shop/scannerdanner (test light and fuel psi gauges)
– 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 https://youtu.be/w9PKJrK4Fbs 6:59
– fuel pump relay checks 7:55
– uActivate plug 8:12
– no spark video (Jake’s car) https://youtu.be/BqcKd_Gdo4A 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 https://youtu.be/sq0HLREinNU 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 www.scannerdanner.com 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 https://www.scannerdanner.com/join-scannerdanner-premium.html 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.