04 Accent Fuel pump relay issues

175

Asked by Oct 03, 2013 at 01:52 PM about the 2004 Hyundai Accent GL

Question type: Maintenance & Repair

Last month the fuel pump went bad.  I replaced the fuel pump and found that ECM relay had caused the fuel pump issue (had a windshield leak).  I resealed the windshield and replaced the relay.  The vehicle started and ran like normal once.  I turned the vehicle off and it wouldn't start again.  I checked all the fuses and everything checked out.  I removed the cover to the fuel pump relay and found the relay was not kicking the fuel pump on.  I manually pressed the contacts together and heard the fuel pump running.  Car starts and runs.  If I release the contacts they continue to stay in place and the car will run until turned off.  If you try and restart the car the contacts do not make contact and you manually have to make contact to get it to run.  I checked the pins firing the relay.  I found battery voltage on one side of the fuel pump circuit and the other ohm's out to the fuel pump.  The relay side of the contacts, I have battery voltage on one when the key is turned on and the other side it ohm's .020 to ground when the key is in the on position.  According to the wiring diagram this is correct and I don't see anything causing the relay to not fire correctly.  I replaced the relay with a known good relay and it still doesn't fire.  I pulled the relay up enough I could check the pins on the relay while in the connector and the pins have the same voltage and grounds as before.  I am stumped, the relay by the diagrams I have should be working properly.  The only thing I can think of is the ground on the one side has to much resistance not to fire the relay but if that is what is causing it why would the relay continue to fire only after manually touching the contacts.  The only thing I can think of is the ECM but I hate to waste a couple hundred bucks on a guess.  Anyone have a diagnostic test on the fuel pump relay circuit so I could make sure before buying a new ECM or any idea's on what the problem could be?

1 Answer

175

After checking everything again and still not finding any resistance on the wires from the ECM to the Relay I took the risk. It helped I found a used ECM from E-bay for under $50 bucks. (the dealer wanted $800) I put it in tonight and it fired up without an issue. I take it that the ECM shorted out and did not give the circuit the correct amount of ground for start up.

7 out of 7 people think this is helpful.

Your Answer

Add photo

Related Questions

Search Hyundai Accent Questions

Hyundai Accent Experts

#1 dvigano
dvigano
Reputation 940
#2 karibt
karibt
Reputation 820
#3 Tom Demyan
Tom Demyan
Reputation 680
View All

Related Models For Sale

Used Hyundai Elantra
924 Great Deals out of 53,405 listings starting at $1,799
Used Toyota Corolla
1,336 Great Deals out of 68,327 listings starting at $1,399
Used Honda Civic
1,143 Great Deals out of 65,145 listings starting at $1,195
Used Hyundai Sonata
995 Great Deals out of 50,006 listings starting at $700
Used Kia Rio
118 Great Deals out of 6,907 listings starting at $1,700
Used Honda Accord
1,200 Great Deals out of 78,037 listings starting at $969
Used Ford Focus
1,254 Great Deals out of 58,946 listings starting at $1,395
Used Mazda MAZDA3
470 Great Deals out of 27,114 listings starting at $1,999
Used Toyota Camry
1,482 Great Deals out of 100,777 listings starting at $700
Used Nissan Sentra
762 Great Deals out of 52,814 listings starting at $1,800
Used Toyota Yaris
95 Great Deals out of 10,160 listings starting at $2,500
Used Ford Fiesta
275 Great Deals out of 17,001 listings starting at $2,995

Used Cars For Sale

2016 Hyundai Accent For Sale
37 Great Deals out of 6,545 listings starting at $8,000
2015 Hyundai Accent For Sale
117 Great Deals out of 2,540 listings starting at $7,988
2014 Hyundai Accent For Sale
29 Great Deals out of 911 listings starting at $6,890
2013 Hyundai Accent For Sale
47 Great Deals out of 887 listings starting at $4,999