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!
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!