As far as i can understand normal operation should be:

Closed Throttle = 5v
Slight movement = 4.4v
Straight slope graph down to
Open Throttle = 0.5-0.3v



What i have measured in my car L6 with PF01 TPS (Tried 2 of them and got same result !!) is:

Closed Throttle = 0v
Slight movement = 4.4v
Straight slope graph down to
Open Throttle = 0.5-0.4v


Does anyone have an explanation as to what is going on. Like i say, i have tried 2 different PF01s and both give the same results.
Are BOTH TPS faulty and this is what happens when they fail ??? You loose the 5v signal at closed throttle ??

Advice appreciated.

thanks

 

Sounds plausible.

 

does sound like the track is broken on the rest on both of em.

 

they both sound fine to me

 

What... that 0v at closed throttle is OK, and the L6 ecu will be fine with it ???

 

i might be talking complete bullcrud, well i probably am but aren't 4wd and 2wd tps different and one of them drops to 0v at closed throttle but the other doesn't?

 

yep 2wd is open circuit at idle the n5volts to 0 or there abouts
4x4 is 0 at idle progressing to 5v ft
if i recall corectly

 

Yes your right, I have L6 2wd ecu and 2wd pf01 TPS, and the voltage gradually drops as it should. However, the starting point should be 5v with a little step down to 4.4v.
I have 0v with a big step up to the 4.4v, then everything looks fine from there onwards

 

you never get 5 volts 4.8 is more the max you will see

 

buy a pf09 and an l8 bin the crap pfo1 and l6

 

just read this in your old thread i found

PF01 - this is a variable resistor but with a switch in series with the wiper so that when the throttle is closed the output goes open circuit. The idea behind this is that the closed position is clearly defined. The sensor must be set up so the slightest movement will close the switch and the voltage will change from 5v to 4.4v.(the voltage decreases to 0.35v when the throttle is fully open). The disadvantage is that the most likely fault is an open circuit due to wear or a wiring problem, which cannot be identified by the ecu and so will not flag up a fault. A faulty output could cut the fuel during normal driving causing misfires or an engine which won't rev. The setting up of the switch position is critical as the throttle does not have to open very far for the revs to rise and the ecu must realize that it is the throttle controlling the revs and not the idle speed control valve, the result may be surges or stalling.

PF09 - This sensor is just a variable resistor and the extra programming capacity in the level 8 ecu is able to automatically calibrate the closed throttle position. The calibration takes place during normal driving by detecting the lowest stable voltage from the tps (which should be the closed position) and it then sets the threshold to that value plus a few millivolts. Because the voltage should never be 0v or 5v, unlike the PF01, then an error can be flagged up if they do to show a tps error and the program modified to ignore it. The tps is wired with the supplies reversed compared with the level1 / level6 so the voltage increases with throttle angle.


looks like both of yours ar fubard

 

It was the fact that different 2 units were giving me the same that i questioned the results.

 

Dave the PF01 i gave you last night worked perfect on my car. Did you take Robbies one aswell?

 

No i didn't Paul.

I think i'm just gonna run the car as i don't believe they are both knackered. If it runs fine i'm not bothered. I keep worrying about specified numbers and getting no where.

Going out for a bozz tonight to test.

 

For clarification of my experience as described above.