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Topic: Throttle position sensor (Read 948 times) |
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cossieguy
Full Member
1996 Cosworth Ultima saloon
 
Posts: 550
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Throttle position sensor
« on: Dec 6th, 2006, 3:42pm » |
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Right i'm almost 100% certain i've got a problem to do with the TPS. After booting the car (Using kickdown) the idle and driving revs are too high 1000-1100 rpm at idle. If I reset the car(Battery off) it idles fine until the next time i boot it etc. How do i check the TPS? I haven't got access to obd scan, is that the only way to check this out? Has anyone else got/had a similar fault with the tps? It seems that by using kickdown(WOT) it throws the TPS off somehow, is that possible?
Guy.
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scorpio_man
Administrator
Ford Kuga awd
Posts: 5654
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Re: Throttle position sensor
« Reply #1 on: Dec 6th, 2006, 3:59pm » |
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hi there
you can check it with a meter set to 5 volts. can't remember if it goes up or down. should be a nice smooth action, though.
hth
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harry.m1byt
Full Member
What's YaBB?
Posts: 792
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Re: Throttle position sensor
« Reply #2 on: Dec 6th, 2006, 4:15pm » |
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Getting back to basics - So far as I am aware it is a simple potentiometer, just like a volume control on a radio. Three terminals - one for each end of the pot' and the third the sliding variable resistance contact.
So between the first two should be a steady fixed resistance - resistance measured between either of these two and the third one should be adjustable by turning the shaft. If the pot is sound and clean, then the actual value should change nice and smoothly as you turn the shaft.
Some one may be able to advise actual values against which you could compare your TPS.
In use - two different stable voltages are applied one to each end of the pot, then the third pin outputs a voltage dependant upon the position of the throttle.
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August '95 2.9 12v auto Ultima -
Now flashing 
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cossieguy
Full Member
1996 Cosworth Ultima saloon
Posts: 550
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Re: Throttle position sensor
« Reply #3 on: Dec 6th, 2006, 9:17pm » |
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Further development, as mentioned in other threads i've now fitted my in line crankcase breather filter and thoroughly cleaned my viper induction kit. Took car out and gave it a gentle reminder it's a cossie  stopped car several times and put in park/neutral and couldn't get the problem to show itself Bit early to say its gone but looking promising.
Guy.
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Octavian_P
Senior Member
 
Posts: 1126
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Re: Throttle position sensor
« Reply #4 on: Dec 7th, 2006, 9:28am » |
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From what you say maybe the throttle plates stick. When you kick it down the plates move more and maybe the have gung deposits on them and don't revert to neutral position right away. So it could be coincidence when you take the battery out, or the ECU ajuts it's self for the slight open throttle body.
Well it ore of a hunche but worth checking.
Cheers
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2.0 16V Ultima|2.3 16V Ghia|2.9 24V Cosworth Ghia
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cossieguy
Full Member
1996 Cosworth Ultima saloon
Posts: 550
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Re: Throttle position sensor
« Reply #5 on: Dec 7th, 2006, 9:55am » |
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How do i check/clean the throttle plates? Wouldn't even know where to start looking.
Guy.
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scorpio_man
Administrator
Ford Kuga awd
Posts: 5654
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Re: Throttle position sensor
« Reply #6 on: Dec 7th, 2006, 1:38pm » |
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hi there
this is for a mondeo, but give you a good idea of what to do.
on the 24v, i think you need to take off the inlet mainifolds first.
hth
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