I'm working on a 2001 F550 7.3L DIT. The engine starts and runs fine, but there is absolutely no throttle response! ALL the guages don't work, except the hazard lights. NO SPEEDO, NO TACH, NO FUEL, NO WARNING LIGHTS, NOTHING. Vehicle will move under idle. Pulled codes P0381 (Glow plug circuit malfunction), P0221 (Throttle switch "B" Range/Performance), P1139 (Water in Fuel Circuit Malfunction). Not sure if they are related to the inop instrument cluster, but that is what came up. Any ideas? This is really weird. Fuses look ok. Any help would be greatly appreciated.

Thanks in advance.

 

P0221 is your problem. it is the Throttle Position Sensor (TPS) that is gone. these fail quite commonly, and the fix is a new throttle pedal assy

look here http://www.dieselsite.com/index.asp?...PROD&ProdID=65

i'm trying to find another, give me a minute..

 

it's alot cheaper at Powerstroke Shop-- http://catalog.powerstrokeshop.com/p...02&catalogid=1

 

Update...Just replaced the TPS sensor, and it did NOT fix it. I'm kinda thinkin a PCM. What do you think? Sucks!

 

WAIT WAIT - check ALL your fuses.

I recently (accidently) discovered that one fuse controls instruments and instrument lights AND the fly-by-wire throttle.

Fuse fixed, problem gone.

Check that before you spend more money. WIth luck, it will be a 50 cent item.

 

SEE!!!! This is why I love this forum! I OWE you a drink!!! YOu are the man! Damn it, that was it! little 10 amp mini fuse in the I/P. Nicely done. Thank you a million times over. Whew!!!

 

OH man, another first for FTE!
I'm going to file this one in my memory for the future.

 

Yeah, I was going to tell you to look at 10 amp fuses - but it dawned on me that your F550 might have a different setup mine and could be a different fuse.

Anyway, only glad to help!

 

Drivetrain is the same as all the rest. It's the frame and suspension that's different.

 

I knew that, but I didn't know if they had altered any circuitry, wire loom, etc. Probably not, though.

 

Test drove the truck for about 40 miles this morning, no problems! Guess that's why Ford says to do all the preliminary checks first before diagnosing everything. Excellent job gentelmen, well done!!

 

Where was the fuse and what number was it? Thanks. LPR

 

It was a 10 amp mini fuse at the instrument panel , middle row of fuses in the center. Thats fuse #19 for the Instrument cluster, GEM module, Overdrive cancel switch, Idle validation switch, Passive anti theft module.

 

Well......I spoke too soon! The damn thing blew the fuse again today and stranded one of my drivers in the middle of an intersection, so you can see why I'm a little bummed out. Now, however, the fuse blows every time I replace it! Anybody have any ideas? I think the GEM module, overdrive cancel switch, instrument cluster idle validation switch and Auxiliary powertrain control module are on the same circuit. Guess I'll just start trying to isolate them. Thanks for any help...

 

Okay, well you know why the throttle wouldn't work - now you have to find out why it is blowing fuses.

Sorry to say, the first was easy, but the second can be very, very difficult and tedious. I wish I had a suggestion -

Well, only one - my blown fuse happened because I pulled one of my aftermarket gauges out to replace a bulb. Somewhere there is a bare wire (or two) that grounded (or shorted) and popped my fuse. I know where to look - that is what holiday weekends are for, right?

Do you have any new gauges, or have you done any wiring work under the dash? That is where I would start. Other than that, a methodical check (with multimeter in hand) of all potential wiring.

I'd rather go to the dentist.