Unreliable! TPS? - PowerStrokeNation : Ford Powerstroke Diesel Forum
 
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post #1 of 10 (permalink) Old 08-04-2017, 05:03 PM Thread Starter
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Unreliable! TPS?

Ok, had problems last year and shop replaced fuel pump. Still ran rough, then only idle...tried to get TPS to work, but then died. Finally narrowed down to IPR for no-start. Replaced that the other day and started right up, ran 50+ miles great over a few days. Then after a good day, went to start up about an hour later and only idle. Next day ran codes and as I'm working on it, pedal finally works again. Does the TPS cut in and out like that? I'm afraid of leaving my driveway and getting stranded.

I don't really know what I'm doing with my AE scanner but this is what showed up. Don't know what tests to run. Buzz test sounded good.

Codes:
P1280 ICP sensor circuit low
P1391 GP circuit low bank1
P1393 GP circuit low bank 2
P0113 Intake Air Temp circuit high input
P1000 OBD systems readiness test not complete
P1670 Electronic feedback signal not detected
P0220 Throttle/Pedal position sensor/ switch B circuit

At idle/ 1500 rpm
Accelerator Pedal Positions 11.77 / 27.45
APP volts .59 / 1.37

also, probably unrelated, but the Engine Coolant Temperature Input starts out reading 302 or near that, so something is going on there, as it can't be that high right off the bat.

Thanks

1997 F250 HD XLT Xcab 4x4 flatbed. MT rebuilt ZF S5-47. All stock 170k
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post #2 of 10 (permalink) Old 08-04-2017, 05:08 PM Thread Starter
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Re: Unreliable! TPS?

Before IPR replacement it was showing the P0122 Throttle A

1997 F250 HD XLT Xcab 4x4 flatbed. MT rebuilt ZF S5-47. All stock 170k
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post #3 of 10 (permalink) Old 08-04-2017, 06:01 PM
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Re: Unreliable! TPS?

There is no engine coolant temp input. What you're experiencing might be the idle switch (IVS) on the pedal, or its circuit. You'd have to catch it in the act, check codes and sensors right when it's happening.
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post #4 of 10 (permalink) Old 08-07-2017, 01:16 PM
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Re: Unreliable! TPS?

The Idle Validation Switch is the one that causes "Dead Pedal", There is a tab on the pedal that is not set correctly in relation to the operating button on the IVS microswitch. When the pedal is depressed, you should hear a click and when you release the pedal you should hear another click when the switch resets. One click means the switch is not resetting. Adjust the metal tab clearance until you hear two clicks when cycling the pedal. Or install a screw to hit the button as the tab is fairly hard to bend.

Once you get two clicks, cycle the pedal several times to insure repeatability of the IVS, cycling the IVS once is not enough.
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post #5 of 10 (permalink) Old 08-07-2017, 01:31 PM
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Re: Unreliable! TPS?

Quote:
Originally Posted by clovistruck View Post

Codes:
P1280 ICP sensor circuit low
P1391 GP circuit low bank1
P1393 GP circuit low bank 2
P0113 Intake Air Temp circuit high input
P1000 OBD systems readiness test not complete
P1670 Electronic feedback signal not detected
P0220 Throttle/Pedal position sensor/ switch B circuit

Input starts out reading 302 or near that, so something is going on there
These all point to a supply problem. Most likely a short or open since they work sometimes. Lots of things you can do and starting at any of them will likely lead to the same spot. I'd start at intake temp since it's easy. Just pull it and hook a meter to it. Should be 5v. If not go down the wire wiggling it until 5v shows up. Once it does stat checking the last place you wiggled. If it never does check power and ground at the pcm.

Good luck.

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post #6 of 10 (permalink) Old 02-26-2018, 03:08 PM
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Re: Unreliable! TPS?

Quote:
Originally Posted by jamiesaun View Post
These all point to a supply problem. Most likely a short or open since they work sometimes. Lots of things you can do and starting at any of them will likely lead to the same spot. I'd start at intake temp since it's easy. Just pull it and hook a meter to it. Should be 5v. If not go down the wire wiggling it until 5v shows up. Once it does stat checking the last place you wiggled. If it never does check power and ground at the pcm.

Good luck.

Where’s the ground for the PCM is this located above the driver side fender?
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post #7 of 10 (permalink) Old 02-27-2018, 12:15 AM
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Re: Unreliable! TPS?

Quote:
Originally Posted by Ryan Goodnight View Post
Where’s the ground for the PCM is this located above the driver side fender?
Not sure man. It'll be somewhere close to the pcm though. But the best place to take that measurement is at the pcm itself. Back probe the pcm connector and measure from there to battery negative. If you go straight to the frame you could miss it.

Edit: and take the reading under load. Don't fool with resistance readings, they don't work.

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post #8 of 10 (permalink) Old 02-27-2018, 12:20 AM
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Re: Unreliable! TPS?

And yes it's usually around the fender or firewall if the pcm is up there. But for this truck I can't say where it is, I'm not sure.

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post #9 of 10 (permalink) Old 02-27-2018, 04:40 AM
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Re: Unreliable! TPS?

Sits in the firewall behind the parking brake.
Don't have a diagram handy, I'm sure there's a wired ground. But also, Iirc, the case is grounded through the mount.

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1979 chevy c30 dually, sm465, 373's? Converted to 6.2 diesel, pump turned up and advanced a hair.(wrecked)
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post #10 of 10 (permalink) Old 02-27-2018, 05:28 AM
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Re: Unreliable! TPS?

There's no case ground. Not shown in the EVTM, and I've run one of ours with a spare PCM/IDM just sitting on the insulation stuff on the inner fender.
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