[mark22707]

Hey y'all i have 2001 7.3 F250 with about 165K miles on it. The other day i was driving around all day and when i got home and went to go out again the truck would not start. I have an edge tuner and it reading "PCM Not Responding" and the truck would crank but not start. My glow plug on the dash does not light up either when i turn the key to the right. I tried everything from un plugging the batteries, to jumping the relay on the glow plugs and checked all the fuses and even changed the CPS so I'm a lost as to whats going on. I even had a buddy bring his Snap on Scanner over and it kept saying "No Response"

Any help would be appreciated, Thank you

-Mark

 

[Absolute]

Try turning the key to on, but not start. Best to have a friend help since you will be looking for the fuel pump to fire, so need a helper to turn on key and listen by drivers frame for pump on. It has a 20 second cycle unless started, so may have to do the key a few times. While on friend listening, unplug one sensor at a time. If the fuel pump starts, you have found your dead sensor, replace. If it works, plug back in and move to the next one. Start at top with the Map sensor since its usually the culprit, but I have money says its the EBP sensor. Try all the sensors, if no luck, we will go from there. No computer communication is the main culprit with this as well as crank no start, and dead glow plugs and fuel pump. You will here the fuel pump fire up as soon as you pull the right sensor. Since you have only 20 seconds to pull the plugs I would cycle the key after each sensor pull to be sure your within the 20 seconds. Hope it helps, if so let us know please. And the cure to this is a OEM sensor and clean the corrosion off the plugs. Its shorting out.

 

[RT]

Check fuse #30. If it's blown, unplug your fuel heater, replace the fuse and start it. Replace the fuel heater at your convenience with the updated model.

I know you said you checked them already, but pull this fuse and really check it. Use a voltmeter if you can't tell by looking.

 

[Absolute]

I should have also added, once the pump fires back up it will probably run fine without the sensor until you get one. Depending on the sensor failing. In most cases its the EBP, or map sensor. Or the fuel bowl heater as said above. They all cause the same thing. A powered short to the pcm telling it to shut off communications and other stuff noted. The unplug method is a good way to find this since a scanner will not hook up until the bad sensor is unplugged.

 

[mark22707]

It's been freezing cold where I live so I'll check that out this week but just a little more information I did check to hear If the fuel pump is on and it was so i will held everything you guys said this week
Thank you

 

[mark22707]

UPDATE: I checked and tried everything y'all said and still no start

 

[petwolf]

Odd that pump runs with no input from PCM. Pcm may have fried. Remove tuner and try again.