Fun little electrical problem
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Fun little electrical problem
I drive a 2002 f350 with the 7.3 psd. The other day I was driving and went to turn off the overdrive, and as soon as I hit the button my instrument cluster died and I lost all throttle control. The truck still runs fine, but it's acting like the truck doesn't realize that it's on. The reason I say that is because when you open the door while the truck is running it dings at me like the truck is off and it doesn't want me to forget my keys. I have driven ford trucks all my life and that has never happened before. I feel like there's a short somewhere under the dash that is causing the problem. Honestly I don't really know what's going on, but the more I mess with it, the more I feel like that's the case. I've pulled apart the some of the dash/ steering column and still can't find anything. Also, I scanned it and ran every test the scanner had and I'm getting no codes anywhere. Any ideas would be extremely helpful.
Logistics Pro
Joined: Aug 2009
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From: Arizona
Well we have the same truck. I've only had mine a short while but I've been sponging up as much knowledge as I can. Probably be morning before a real expert shows up but meanwhile, here goes: The 2002 has an APS (Accelerator Position Sensor) mounted on the pedal that also contains the IVS (Idle Validation Switch), unlike earlier models where the IVS is separate. Don't know about your scanner, but with the Ford scanner, or AutoEnginuity you can see what the APS is sending to the PCM for voltage. You will have to look in your service manual for the specs, but the ref is 5 volts. You should see the voltage rise as the pedal is depressed, to somewhere in the 4's I believe at WOT.
If you don't see that then you would need to follow the diagnostic procedure in your service manual to trace it down. I've heard of people just replacing the APS only to find out it was something else in the circuit.
If the APS is indeed faulty it is available only as a complete pedal assembly. Napa was supposed to have the APS separate for our trucks but they actually sell the whole pedal assy only. Plus I read about some guys who said the Napa ones were crap.
This is just for starters, hopefully someone will chime in when the other coast wakes up. For now I'm hitting the hay myself.
I suppose you checked all the fuses and relays?
If you don't see that then you would need to follow the diagnostic procedure in your service manual to trace it down. I've heard of people just replacing the APS only to find out it was something else in the circuit.
If the APS is indeed faulty it is available only as a complete pedal assembly. Napa was supposed to have the APS separate for our trucks but they actually sell the whole pedal assy only. Plus I read about some guys who said the Napa ones were crap.
This is just for starters, hopefully someone will chime in when the other coast wakes up. For now I'm hitting the hay myself.
I suppose you checked all the fuses and relays?
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Posting Guru
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From: Bridgewater, VA
APS (well TPS as I've heard it) was my first guess from what you're stating. Check fuses as well. Seems kind of weird that the CC is causing a problem with the news of the recall: https://www.ford-trucks.com/forums/8...nspection.html seems unrelated to problems stated in the recall, but worth a look into
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I'll check all of those things tomorrow after work. I seem to recall being able to see what the APS is sending to the PCM, but I can't remeber at the moment. Thanks for the help guys! I post back when i've tried what I can.
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Well, i'm pretty sure I found the problem. It was fuse number 45. Somhow I missed that on my first runthrough on the fuses. It might not be the real problem, but the truck moves again. Thank you all very much for your help. This site is incredible!
Logistics Pro
Joined: Aug 2009
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From: Arizona
Well that makes sense, fuse 45 feeds the auxillary PCM, APS, Overdrive cancel switch, 4WD control module & the instrument cluster. You must have a short somewhere in the Overdrive cancel switch circuit that will probably rear it's ugly head again.
Hotshot
Joined: Dec 2005
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From: Chino Valley, Arizona
the wiring on the shift lever for the OD is a solid wire, very common to break, pull the steering wheel covers and replace the shift lever if it is broken or chaffed, the wire becomes work hardened after time from the lever moving. most for dealerships stock quite a few of the shift levers.
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