Throttle Position Sensor

[tozerman]

Hi guys can anyone tell me how to set accurately the Throttle Position Sensor as i knocked it and as it was slightly loose it moved, the engine will still run but not very well.
Thanks Guys.....Tony..
oops i nearly forgot it is a V6 s3c....DOH!!!

[Barkychoc]

Is there any evidence where it was before - screw imprints or a clean bit showing under the screw that wasn't before?

[tozerman]

Is there any evidence where it was before - screw imprints or a clean bit showing under the screw that wasn't before?

There is but i thought while I was at it I would make sure that it is set up properly !!!! Any thoughts ?

[kenpage]

interesting topic i did not know there was any setting up of a t/p i just bolted it on and connected the plug

[Barkychoc]

I don't know much about the V6 - but does the ECU just 'learn' the position once fitted?

[tvrgit]

kenpage said:

interesting topic i did not know there was any setting up of a t/p i just bolted it on and connected the plug

No me neither - suspect it's broken or a loose / damaged connector, rather than needing adjustment.

[Sweet Thunder]

Barkychoc said:

I don't know much about the V6 - but does the ECU just 'learn' the position once fitted?

The ECU learns the position after the battery power has been taken off for a while: take the negative wire off the battery, keep it against the positive terminal for a few seconds to 'decharge' it and reset the ECU values to default. After reconnection of the battery terminal, the ECU assumes the position in which it finds the TPS will be the closed position. The car may need to get through a complete cold/hot/cold running cycle to get all its settings right.

[tozerman]

[quote=Sweet Thunder keep it against the positive terminal for a few seconds to 'decharge' it and reset the ECU values to default.
[/quote]

If i do that wont it just short circuit the wire ? Just a thought !!!

[Sweet Thunder]

tozerman said:

[quote=Sweet Thunder keep it against the positive terminal for a few seconds to 'decharge' it and reset the ECU values to default.

If i do that wont it just short circuit the wire ? Just a thought !!!

Taking the battery terminal off (preferably the negative terminal)when the engine is not running, isolates the power source (battery) and the consumers. As long as you just short circuit the consumers in the system this is not a problem. What you're not supposed to do is make a short circuit on the power source (e.g. the battery, and alternator when running), or a circuit connected to a power source. That would cause fireworks! Also, never take the battery terminal off when the engine is running, because with the engine running the alternator produces current that needs to flow to the battery.
Shorting the wires of the consumers will have no effect whatsoever on consumers like bulbs, electric motors etc. The electronic units however (engine ECU, alarm, immobilizer, radio with anti-theft code, not much more in your average S series) have capacitors in them to keep alive its memory. a short circuit will decharge the capacitor, so that the memorised values are lost. This resets the electronic unit to default settings.

You usually get the same effect if you take the battery terminal off and leave it for several days. This is a slow way to decharge the capacitors and erase memorised values.