dead accelerator pedal, P0652 ???? - Ford Powerstroke Diesel Forum
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Old 02-08-2013, 05:42 AM
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dead accelerator pedal, P0652 ????

Someone help?
Anyone I have an issue and would like to know what everyone thinks.
This is on a 2009 6.4
Hereís the deal. Yesterday I was installing a ridged 20Ē light bar I had to rearrange some wiring for my winch in order to put the light bar where I wanted it; I may have made a dire mistake.
Once I rearranged the winch control box to where I needed it to be I found myself short with the power cables, in my wisdom I wired the positive cable to one battery and the negative to the other. Red to red driverís side black to black passenger side. I thought this would be OK; Did I wire it to 24 volt? The reason is once I started the truck it run ok, but I had to shut off the truck and do more, and now when I start the truck I have high idle 1450 RPM and a dead accelerator pedal, The truck is Spartan tuned with the 275 tune and has been for 15 months, No DPF, The codes it is showing are
P0652 sensor reference voltage B Circuit low
P1000 systems readiness test not complete
I tracked all the wiring I did and canít see anything that may be shorting, All I can think is I somehow sent 24 volt into the truck and cooked something.
Anyone have any ideas?
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Old 02-08-2013, 05:48 AM
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The sensor crapped out. PM me if you want a new one. The "TPS" on the pedal is what goes on these and the 7.3L. In stock, can ship today
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Old 02-08-2013, 05:53 AM
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Witch sensor would it be right, on the pedel? I am on a remote drilling location so if you can send it to a UPS nearby I could send someone to pick it up
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Old 02-08-2013, 05:57 AM
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Yea the sensor on the pedal. Its all electricle. Pm me with the model truck you have!
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Old 02-08-2013, 06:05 AM
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Wiggle the pedal and see if it fixes it, if it does. then you need a pedal
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Old 02-11-2013, 11:35 AM
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Ok I pulled the plug off the throttle and did some probing with the key on truck not running,
As far as I can figure out I am getting at the plug is

APP1 Signal = 4.891 V APP2 Signal =0.019
APP1_VREF = 2.59 APP2_VREF= 2.60

All signals were tested using both ground 2 APP2 and Ground 2 witch I think also continues as ground to all EGT probes and ground to DPFP sensor and WIF sensor.
I may be reading the electrical diagram wrong but I would think you should be getting the 4.746 to 5.254V on the APP1_VREF line correct?
My thought is APP1_ VREF would be signal to the pedal and APP1/APP2 signal would be the return signal to the ECU ? Am I backwards on that ?
In any configuration there seems to be lack of power to the APP2 Signal, I really have no idea where to go from this point,
APP2 seems to ground at the ECU to connection 50 should be Ground connection #6
And the APP1 looks to ground through connection 22 should be Ground connection #4
Anyone know where them to ground connections connect to the truck ? Could be I broke the ground connection to #6 but like I said before everything other than APP2 seems to be working
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Old 02-14-2013, 12:47 PM
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Ok replaced the pedal with a new one, still the same anyone have any ideas ?
I am stuck here
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Old 02-15-2013, 05:47 AM
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Never Mind, I found the issue all fixed
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Old 02-15-2013, 06:00 AM
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well ??....What was it ??
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Old 02-15-2013, 06:25 AM
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Ok long story short, It was the NUT 20 inchs in front of the steering wheel
Here is what I did, It was a wiring short like suggested however not a wiring problem from the other day but one from 2 years ago. That is when I installed up lifter switches in my truck.
When I wired the up lifter in everything was fine, I had power to the accessories I installed and everything was working, I was only using 3 of the 4 switches The other day I tied into the last remaining switch , Problem occurred spent today checking power under the hood at the up fitter blunt ends and found a nice steady 5 volts on #3 when the switch was off, I had tied into the 5 volt system when I installed the switches, It never caused a problem because it was always just bunt cut until last week, needless to say when I tied into it I grounded out the 5 volt to the pedal, Went under the dash cut that wire and blunted it off, started the truck, purrs like a kitty.
Moral of the story don’t let me wire on your truck!
Thanks to everyone that helped out it give me directions when I was stumped.
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