Voltage problem!!! Need more hps lol

Bret Adkins

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07 Mazda cx7
So I've been trying to find out what's been goin on with my hpfp. I just got a new oem one because I thought that was the problem but guess what it wasn't. Looks like I wasted $400 lol. But my problem I found was that it's not getting the voltage it needs. I put a jumper wire from the battery to the pump and it works great now but I want to know what needs to be done so I can get rid of that jumper wire. Why would I not be getting the voltage it needs?? Any help would b great thanks.
 
Check the hose clamp on your intercooler hose where it couples to the turbo. It is very close to the wiring harness on your ECU. There are reports of the clamp screw being oriented too close to that harness and fraying wires causing electrical problems, including the current to the high pressure pump. The clamp should be rotated so that its screw is turned away from those wires. If they are already frayed, you may have a mess on your hands, that mere electrical tape may not fix.
 
I tied into the wire close to the I tied into the wire close to the EC you ecu and jumped over and still nothing
 
Sorry was at work when I sent that lol. I tied into the wire that's to the pump close to the ecu and jumped over to the pump to see if it was a bad wire and that didn't help. Car runs great for right now because I have it to the fuse block. But I'm sure it's not good on the pump to keep it that way am I right? Could it be an ecu program?
 
I misdescribed the clamp. It is the one on the coupler on the intake side between the MAF sensor and the turbo inlet pipe. That clamp has a screw that is right next to the ECU. If the screw is not oriented away from the ECU and the wiring harness coming out of the bottom of it, when the engine rocks on its mounts during operation it WILL fray the wires. Check there. This is a common known issue.

Sorry for the misdescription. There may be other wires affected besides the wire to the high pressure pump.

I doubt it is an ECU issue itself. It is not good for the fuel pump to stay on when the engine is off. There is also a circuit that interrupts the fuel pump if you try to start the car with the gas pedal all tve way to the floor. We use this for service when you need to turn the engine over with the starter for different reasons and don't want fuel in the cylinders. Checking compression, for example.

I don't know where the ECU is on a CX 7, so maybe I'm off base. On MS3s it is on the side of the battery box right next to the intake pipe going to the turbo.
 
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