2013 Ford Taurus Schrader valve?

My understanding of these engine are they are a direct injection fuel system meaning the fuel is pressurized to extremely high pressures to inject directly into the combustion chamber. The only way to I've heard to test these systems is to depressurize the system & install a special tool that tees into the fuel pipping to measure high fuel pressure. So these systems do not have a shrader valve in the fuel system. These systems have a pressure sensor monitoring the fuel pressure in the fuel rail.

First, you are not dealing with a traditional system. This vehicle has what is called an Electronic Returnless Fuel System (ERFS). Before I can begin to help, I need to know if there are any trouble codes stored in the computer.

I have attached a schematic of your system. As you will see, there is no schrader on the fuel rail. However, fuel pressure could be tested at the fuel filter with adapters.

One last question, will the engine start at all? If not, will it start if you use starting fluid?

Please keep in mind, there are a few things that can cause the fuel pump to fail. Don't just replace the fuel pump without checking a few things first.

Hello and thank you both for your research into my Taurus.

The car Starts fine. Normal, actually. It stalls slowly. Reminds me of a lawnmower than runs out of gas. (Yes. I have full tank)

I'm not sure how to start a vehicle using starter fluid.

P0113
P0103
P0100

P0113 -- Intake air temp sensor 1 circuit high

Possible causes:

IAT open circuit
IAT short to power
Damaged IAT sensor
Wiring incorrect

P0103 -- Mass Air Flow circuit high

Possible causes:

MAF open circuit
MAF short to power
Damaged MAF sensor

P0100 -- Mass Air Flow circuit A high

Possible causes?

MAF open circuit
Intake air component incorrectly installed.

Wow... where do we start. Based on everything I have read to this point, it sounds like either you have no power to the MAF/IAT sensor. That is where we need to start. Are you able to check the MAF wiring harness to confirm that it is getting power and a good ground?

Is this the sensor?



If you can guide me on testing procedure, I'll start immediately.

Thank you

Before we begin, please make sure there are no obstructions in the air intake system, everything is tight and properly secured, and the MAF is properly seated.

If all looks good, disconnect the MAF sensor harness. The connector should be a six pin connector. I need you to locate pin 3 (VPWR) on the power supply side. Turn the key to the run position with the engine off. Using a volt meter / multi meter, probe pin 3 with + of meter and ground the other side of meter.

Do you have at least 10.5 volts?

Let me know so I can continue on the right track.

I'm only able to locate a 4pin/wire

from what I understand. I could be hugely mistaken though.
Taken from
http://easyautodiagnostics.com/ford/4.9L-5.0L-5.8L/maf-sensor-tests-1


"Ford has used a Hot-Wire type mass air flow sensor for many years that either comes with or without an internal air temperature sensor. If the MAF sensor has 6 wires, then this is a dead giveaway that it has the air temp sensor integrated inside. If the Ford MAF sensor on your car has 4 wires, then it does not have an air temp sensor integrated within it (the air temp sensor will be somewhere on the air duct that connects the MAF sensor to the throttle body or somewhere on the intake manifold.
On the image viewer on the right, you'll see photos of several different Ford MAF sensors. These come in either a black or light gray body and with 6 or 4 wires in the connector. Regardless of what color body the MAF sensor has or the amount of wires in the connector... they are tested the same"

The one you sent me is for a different engine. My manual says it is a 6 pin connector. I attached pics for you to see.

This is what I have.

Okay, I need to try to do this without my manual. The schematic must be different. It is showing a different set up for you vehicle. Tell me, I see you have been checking the wires. Have you located the VPWR (vehicle power) wire? Have you located the ground?

This might have something to do with it..

The pics didn't come through. Make sure they are a jpeg.

This is the 2013 Ford Taurus
receiver, (AM-FM-CD-MP3, single disc),
Stock Number: I89099430O

Thin green wire is a ground .
Knowing it as a ground, i was curious to find out what the car would do if i ran direct ground to the little green wire as I start the car. Guess what? Well, nothing. Not even a turn of the motor. Dead battery type of attempt. Then I removed the direct ground and car did Start. Until it stalled.
According to my cable tracker it's open somewhere . Just wish I could find out where it leads to.

I could be chasing ghosts here. Who knows. Just thought maybe it would help you with your investigation,

Thanks again

Key in run position with engine off.
Maf harness disconnected


[i]meter - grounded to battery[/i]

[b]meter + connected to ; starting with "A"[/b]

A____5.01v
B____12.43v
C____ .01v
D____4.95v

Key in run position with engine off.
Maf harness disconnected

meter + to battery +

meter - connected to ; starting with "A"

A____7.35v
B____ .01v
C____ .12.37v
D____7.42v

I have to be honest, I'm having trouble because everything I have is off a 6 pin sensor. However, the readings you have seem okay. If you question an open, check continuity between the MAF harness and the PCM.

Stupid question. Did anyone make you aware that this vehicle has an 8 year or 80,000 mile emissions warranty? The MAF falls under that warranty.

Next available appointment within 45miles of me is August.28

I don't have any diagrams to go by. Would you mind briefly telling me which wires I should be checking.?

PCM is under the windshield wipers in front correct?

According to my manual, pin 40 is the MAF at the PCM and pin 41 is the sig rtn.

Are these accurate.?

Different odb2 tool was used and P025A code was read.

That is for the fuel pump module A control circuit open.

Possible causes are:

FPC circuit is open or shorted to ground

FPC circuit shorted to power

FPC module damaged.

It looks like we are back to square one. This issue should be under the emissions warranty. Are you sure you don't want a dealer to look at it? Since the car doesn't run the way it is, they should be able to make some special accommodations for you. However, if you want, we can continue.

Let me know.

Thank you sir for your time. I do have an appointment set up for the 29th.

I would like to know if this is because of something I did (adding audio equipment/leds to vehicle , or is it a "ford" fault..

It's gotta be that little green ground wire I mentioned earlier. When that green wire touches any part of the chassis , car is silent. Won't even crank.
Not a professional diagnosis of course, just a theory .

I wouldn't think the audio addition would have caused this. I am really curious to see what they tell you. Keep me updated.

Well, I got her in the shop early. Three days now and Ford doesn't know what the problem is. This is nuts. I'll keep you posted.
Thanks again for your support.

Wow... This is too new of a car to have this kind of problem. They had it for 3 days and can't find it?

I have to be honest, I have pages of tests to conduct before a solution may be found. If I was you, I think I would request Ford to assist. At least they should pay a portion of the bill. If they had it for 3 days, it isn't going to be cheap. That's just a thought.

Spoke with them today and still nothing. Could be 5 more days. 140 per hour. You bet I'm going to ask they pay a portion...

Don't forget the emissions warranty. It covers all emissions components 100%. And yes, the MAF would fall into that category.

Here we go

And

The problem was a weak or dead battery? Are you kidding?

I asked the service guy what they did to fix it and his reply was "I'm not really sure, but we ran the car for 30 minutes without it stalling.

Battery was purchased just a few weeks before the shop took my vehicle in for "repair".
Not sure how a $150 battery would go bad so quick.

Anyway, car has been running horribly for the past few days.
Now it won't crank no start....
Drama continues.

Oh, I called up ford to see about getting reimbursement for rental car and for service done, well he was fired.

....The service guy handling my situation Was fired

It sounds like you have the same kind of luck I would have with things. Are they going to take it back and fix it? Have you contacted anyone at Ford Motor Company?

Hello and thank you again for your replies.
I just moved and am 100+ miles from the dealership I had it at. I do have an appointment with a local ford on Monday.

Update: car DOES start. "Check charging system" warning pops up.
Driving around or with it in idle, headlights, tail lights. License plate lights, all lights flicker.

Either a ground problem or a bad voltage regulator will cause that. The car is too new to be having all these problems. If the new dealer you take it to can't help, you need to contact Ford Motor Co.