Injector not getting 12v from computer?

SHAHMEER

MEMBER
2015 HYUNDAI SONATA
98,640 MILES

Hi, this car is cranking but not getting start I have changed the fuse box as the car was accidented and someone repair the fuse box very badly I changed it before changing the fuse box car was start but showing a lot of fault codes but know wiring and all the things I have checked and everything is fine but injector are not getting 12v current also no pulse even I just turn on the switch there is no current but when I'm cranking it(trying to start)at that time pulse are coming. Have any idea that what the next thing I have to check or what to do?

3 Replies

KEN L

MASTER CERTIFIED MECHANIC
48,396 POSTS

Yep, it sounds like one or more of the 12 volt supplies or a main ground is not connected. Here is a guide to help you check the grounds and power supplies. Also, here are the PCM wiring diagrams so you can see which fuses to check, which wires to the PCM or power and ground, also to see how the system works.

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

I have marked the fuses and ground to check with a red arrow. Check out the images (below). Please let us know what happens.

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Tuesday, November 19th, 2024 AT 1:34 PM

SHAHMEER

MEMBER
2 POSTS

Hi, thank you so much. I just came here to update you about current situation I checked the wiring everything was fine and now I opened the ECU of this Hyundai Sonata and found the ic for the injector is faulty so will replace this and check it further.

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Wednesday, November 27th, 2024 AT 2:41 AM

KEN L

MASTER CERTIFIED MECHANIC
48,396 POSTS

Nice work, a rare problem but it does happen, I would check the fuel injectors so see if one of them has high resistance. This guide can help:

https://www.2carpros.com/articles/how-to-test-a-fuel-injector

Please go over this guide and get back to us.

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Wednesday, November 27th, 2024 AT 11:46 AM