The problem is the same as described in many places. Replaced the pedal 2 times. We don't have any blown fuses. We are getting code P0122 TPS low voltage. we put a meter on it and we get 5v VREF this is the 3rd TPS so I am lost.

There is a after market Banks turbo, air bakes. I have pulled and cleaned the chip to no avail.

We replaced the pedal with the adjustable $600 then when I was surfing I found there was a non-adjustable pedal for $80 so since we thought it might be a faulty part we took back the $600 for the $80 but we still have no throttle response.

Engine starts great, but just idles.

I don't understand, where does the electric from the pedal goes, so I can check the there end. I am not a electrical guy now I hate it even more.




Banks Chip

 

Making duplicate threads does not help, nor does it make you any friends...
https://www.ford-trucks.com/forums/1...-problems.html

 

screw the truck, how to you delete a post?

 

Little harsh don't you think. Doode is just looking for some help.

 

Don't give up. Friendly bunch here most of the time. Someone will be along who has had a similar problem and try to help.

 

Thanks AllaboutMPG

additional info from the scanner

P0122 TP Sensor Circuit Low Input
Hide
Conditions For Setting This Code:
Key on or engine running; and the PCM detected the TP sensor was less than 0.17v (Scan Tool TP PID reads under 3.42%) in the test. I get constant 5v

Possible Causes:
TP sensor signal circuit open (inspect wiring & connector)

TP sensor signal shorted to ground (inspect wiring & connector)

TP sensor VREF circuit is open (between the sensor and PCM)

TP sensor is damaged or has failed

PCM has failed

 

I think you pretty much answered your own question above.

If you are getting 5v ref AT the sensor, but the PCM is saying that the return signal is too low, then the problem is either the sensor itself, a bad pcm, or a problem in the wiring between the senor and the pcm.

You've changed the APPS (Accelerator Pedal Position Sensor - which is what it is. These trucks do not have a TPS), then it is highly unlikely that you have numerous identically failed new sensors.

Bad pcm. Only good way to tell is to swap it with a known good unit.

Wires. The internet can't really help you with that ( Except for wire diagrams/pin outs). Its a down and dirty pain in the @ss job you'll just have to do, or pay someone to do, to trace out the ground and signal return wire from the sensor all the way back to the pcm, until you find a short/cut/etc... Alternatively, I suppose you could bypass them, and run jumper wires from the sensor to the appropriate pin outs on the pcm. That would at least confirm that there is a problem SOMEWHERE in the harness. But actually finding it can be a tie consuming tedious process. Or not..... You may find it staring you right in the face once you stick you're head under the dash. No way to know.

 

I have a feeling I know the answer to this, but do you happen to have an EEC-V breakout box? That would be the easiest way to diagnose whether this is a wiring problem or a PCM problem.

Obviously you have a scan tool that will read the APP sensor voltage. Does your AP assembly have a single plug with the following wires?

• red w/lt grn tracer
• red/ylw
• ylw/wht
• grn/wht
• brn/wht

 

No breakout box

yes the wires are as you describe

 

OK, that's what I thought it would have, but I didn't want to start posting expected readings, etc. until I was sure.

The wiring diagram shows that the brn/wht wire carries the 5 VREF signal, the gry/wht wire carries the APP signal to the PCM, and the ylw/wht wire is the SIGRTN (ground).

You should have the following readings:

• At least +4.5 VDC on the brn/wht wire, and at least 10,000 ohms resistance to chassis ground
• At least 10,000 ohms resistance to chassis ground on the gry/wht wire
• No more than 5 ohms resistance to chassis ground on the ylw/wht wire

If all that checks out, set your scan tool up to monitor APP volts and disconnect the APP harness from the pedal assembly. The scan tool should read zero volts (or reasonably close to it). Then, carefully jumper the brn/wht and gry/wht wires. The APP sensor voltage should be reading approx. 5 VDC on the scan tool.

 

Pikachu, I wanted to double check the wire colors. Now we are going to preform the readings

At least +4.5 VDC on the brn/wht wire, and at least 10,000 ohms resistance to chassis ground
At least 10,000 ohms resistance to chassis ground on the gry/wht wire
No more than 5 ohms resistance to chassis ground on the ylw/wht wire

Will be back in 15 minutes to confirm these readings

 

wrong info I reposted the correct info

 

I am not too good with electrical, but I can use photoshop

I hope this helps. looks to me like gray/white is over 5 ohms.

 

What scale were you using when measuring ylw/wht to ground. Should be using the lowest ohm scale on the meter. The scale in the picture would be right for the brn/wht and gry/wht

 

OK I retested tested at the lowest setting and here is what I got. I'm lost as to what this all means?