Fuel pump will not turn on

FREEMANATOR

MEMBER
2004 HYUNDAI SANTA FE
3.5L
V6
4WD
AUTOMATIC
190,000 MILES

My fuel pump will not turn on. The relays and fuses are good. I've jumpered the relay just to see if the pump was working and it does turn on. I also get the 12v on the relay pin that comes on when I turn on the car. My understanding is the ECU pulls the last pin on the relay to ground when the car turns on. I wanted to test continuity between the control pin on the relay and the ECU but am not sure what pin and color wire on the ECU to test. All diagrams I've seen so far don't match what I see on the plugs on my ECU. Im hoping this is because I have the 3.5L 4wd. Any help is very much appreciated.

Sunday, October 13th, 2019 AT 9:34 PM

3 Replies

DANNY L

MECHANIC
5,648 POSTS

Hello, I'm Danny.

I've attached 2 pictures below of the wiring diagrams you've requested. Hope this helps and thanks for using 2CarPros.

Danny-

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Saturday, May 8th, 2021 AT 10:12 AM

FREEMANATOR

MEMBER
2 POSTS

Wonderful! Thanks! So if I'm understanding this correctly, I don't have the immobilizer so it would be a green wire going to pin 20 on the PCM/ECU? Also, if I'm looking at the plugs on the PCM, will it be the wiring connector on the right?

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Saturday, May 8th, 2021 AT 10:13 AM

DANNY L

MECHANIC
5,648 POSTS

Hello again.

Okay, I've attached a color diagram of the PCM and immobilizer for you below. I've sent it in 4 pictures to make the picture larger. Hope this helps and let me know what you find. Thanks again for using 2CarPros.

Danny-

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