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Crank No Start No fuel pump prime

  • Gandy911
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12 Apr 2019 07:33 - 17 Apr 2019 19:23 #28617 by Gandy911
Crank No Start No fuel pump prime was created by Gandy911
I have a 2003 Hyundai Tiburon Gt 2.7 v6 6 speed VIN# KMHHN65F13U100010 157k miles that will not start due to not getting power to the fuel pump when I turn the key. The engine cranks and will fire on starter fluid. The car ran fine one no intermittent problems or anything to lead up to this issue. I parked it one day and it sat for maybe a week . I have checked the relays and all are good crank sensor and cam sensors are new, I jumped the fuel pump relay under the hood and the pump kicked on fine. ALSO my obd2 scanner will not communicate with my ECU but the scanner does power on. Every fuse is good and did not have any blown or anything. I did not find any corrosion or breaks during my visual inspection which was pretty extensive throughout the car (i pulled all panels/carpet ect...) I am hoping to eliminate the ECU as the issue. what is the easiest way to eliminate this possibility ? Electrical systems are my weakness to say the least but i do have the basic testing tools. This is not my main vehicle but i really like driving it in the summer and helps keep mileage down on my newer car.
Last edit: 17 Apr 2019 19:23 by Gandy911.

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12 Apr 2019 07:51 - 12 Apr 2019 07:57 #28618 by juergen.scholl
Replied by juergen.scholl on topic Crank No Start No fuel pump prime
Does the check engine light come on with the switch on?

Is the 5 volt reference circuit alive? (look for voltage supply to the sensors with the key in the on position )

Check the powers and grounds to the ecm.

Would the engine start when you powered up the fuel pump externally?

Do you havve a second key just in case it was the transponder chip (any immo light?)?

An expert is someone who knows each time more on each time less, until he finally knows absolutely everything about absolutely nothing.
Last edit: 12 Apr 2019 07:57 by juergen.scholl.

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  • Chad
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12 Apr 2019 08:00 - 12 Apr 2019 08:03 #28619 by Chad
Replied by Chad on topic Crank No Start No fuel pump prime
Verify power on FUSE 16 (10 amp), when the key is in the ON or CRANK positions.

ENG CTRL RLY, Pin23, Orange wire should show battery voltage with the key OFF. Turn the key on, and it should, momentarily, turn to ground. Cranking, it should be ground.


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Last edit: 12 Apr 2019 08:03 by Chad.

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12 Apr 2019 08:05 #28620 by Gandy911
Replied by Gandy911 on topic Crank No Start No fuel pump prime
Check engine light does show on dash with the key on, I did not crank the engine when I jumped the fuel relay cause I was working alone at the time. Normal key ignition no transponder. I will check sensors first and get back asap with what I find out. The ECU will take some time cause Hyundai put it in a very tight spot on this car. Thank you for the quick reply.

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15 Apr 2019 17:02 - 15 Apr 2019 17:06 #28716 by Gandy911
Replied by Gandy911 on topic Crank No Start No fuel pump prime
5V reference alive at sensors. When I power the pump at the relay (30/87) and the fuel pump runs and fills the fuel rails with fuel. The engine still does not start.
Last edit: 15 Apr 2019 17:06 by Gandy911.

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15 Apr 2019 21:02 #28734 by Gandy911
Replied by Gandy911 on topic Crank No Start No fuel pump prime
I will add that I did change all 6 injectors back about 4 months ago. not sure if that would cause any issues. I did not drive the car but a few times since I changed them.....

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02 Jul 2019 09:28 #31323 by Gandy911
Replied by Gandy911 on topic Crank No Start No fuel pump prime
Havent touched the car for months but i went out to try n get my scan tool to connect and i finally did get it to scan, I unhooked my Idle Air Control Valve and my scanner linked up. no codes found, could a shorted IACV cause my computer to shut down my fuel relay?

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