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TPS sensor


lrg_machine

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Finally got freescan working :angry:

and it's giving me

Fault 22 : Throttle position sensor voltage low

Tip : Is the sensor plugged in?

Isn't that nice ! I assume it must be plugged in as the car starts and runs, I just get the fault every now and then.

on to the techy bit,

where is it and can I adjust it, or do I need a new one?

Jez

Mean Green S4s

I think therefore I am - Descartes

I'm pink therefore I'm spam - Eric Idle

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Took me a while to find the bugger.

Stand at the back of the car, and its mounted on the top / rear of the engine.

S4Light006.jpg

Looks to me like its non-adjustable.

Do you have a copy of the 'Electronic MPFI' Manual ??

Its got 2 pages on how to fault find the TPS circuit.

Simon  (94 S4)      My Esprit will be for sale in late 2017

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you can slacken the screws and adjust to get the 0.47 volts (IIRC) at 0% throttle, should be 4.75 or something 100%

sometimes they need a clean, the track inside

can be done with brake cleaner/switch cleaner i'm told.

or a new one

says in the freescan book, the exact numbers i think.

Edited by pitstoppete
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Bible states:

0.45 - 0.70v at idle and 4.5v at wide open throttle. :angry:

It's nice to know you can strip it down and clean / adjust B)

Simon  (94 S4)      My Esprit will be for sale in late 2017

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Thanks Simon

I do have the manual and just found the section you refer to. So first thing in the morning I'll take the sensor off and make sure it's clean and set it to the values given.

Thanks again.

Jez

Mean Green S4s

I think therefore I am - Descartes

I'm pink therefore I'm spam - Eric Idle

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Did a search on Throttle Position Sensor and found this written by 'Dave GT3'

you dont need to buy a new one just clean the contacts.

buy some isopropanol (pure alcohol) or use yur missus nail varnish. (dont tell her though, you know how they moan!)

take the tps off and pop it in a containter so it is submerged. let it soak for 10 mins or so and constantly turn it with a screw driver as if it were on the car.

once all the carbonised crap has come out drench it in wd40 and pop it back on

trust me it will be as good as new.

then jus check you have the positioning set so you get the correct voltages.

you should find it will idle a lot smoother if there was a problem

such a easy fix id do it anyway. they get easily contaminated

Throttle stop possition is tricky if you dont have a bendy screwdriver!

the screw is obviously on the throttle

turn it clockwise i think to lower the IAC counts

they should be between 30-40 ideally when engine is warm and idling

leave it to adjust/settle once you have turned the screw 1/8 of a turn at a time.

p.s: personally id reset the IAC before doing this and the ecu.

but do those two when the engine is cold.

1) reset ecu (disconnect battery)

2) reset IAC counts via freescan (ignition on)

3) turn aircon on and fans

4) start engine and let it warm up to 82 deg c

5) carry out throttle stop possition adjustment if needed with aircon off

(clean the tps before doing that lot by the way)

Simon  (94 S4)      My Esprit will be for sale in late 2017

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