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Old 05-21-2018, 11:05 PM   #1
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Default Tech question 2007 Hyundai Sonata

I picked up a 2007 Hyundai Sonata yesterday supposedly needing a fuel pump. Car was owned by a friends uncle. Was told his daughter was driving it, it shut off, was towed to a repair shop where he was told it needed a fuel pump. He decided to just sell it as is for pennies as it was a spare spare car and not needed. Of course it's never that easy. Replaced the pump still nothing.

Things I have done/tested with power probe.

-Replaced fuel pump.
-Checked continuity from power wire from pump to relay. good.
-Checked continuity from ground wire from pump. good.
-Checked relay and fuse for fuel pump. both good.
-Checked continuity from relay to ECU both pos and neg. good.
-If I put 12v to the fuel pump from the relay location with my power probe, the pump will turn on and the car will start.

Fuel pump is 4 post relay. I receive good power TO the relay from the battery, but when ignition on I only receive 2.5v from the ECU signal wire. I checked continuity as I said so I can reasonably eliminate any issues with the wiring to the ECU.

Next logical thing (in my mind) would be ECU is bad, yes? As far as I was told, the car was driving just fine and simply shut off. Also, if I buy a used ECU, what's it take to program it IF that is needed? I get conflicting answers on brand specific forums...

I feel like I'm at the point of having to "throw parts" at the car which I've never been a big believer in, an ECU also isn't a spark plug, and it's an expensive part to throw at the car if that's the route I need to take. Is anyone on here a tech/have access to AllData schematics for the wiring between the ECU and fuse block and any and all fuses that contribute to the ECU? Any help is appreciated!
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Old 05-22-2018, 12:16 AM   #2
Some say.....
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07 with a 3.3 i assume?
looking at this, i'd be looking at the ECU fusible link/engine control relay
the two blue wires (14 off the junction block) go to the upstream O2 sensors. maybe one of those is feeding back?
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Old 05-22-2018, 01:57 AM   #3
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3.3 yep!

I’ll look at this in the AM but this diagram is helpful, I couldn’t find anything worth a shit via google
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Old 05-22-2018, 02:02 AM   #4
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FWIW it also had these codes when I got it to start, granted the level sensor and pressure sensor weren’t plugged in at the time of start up and read as well

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