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A wiring diagram for the accelerator position sensor can be found in the vehicles maintenance manual. It can also be found in the cars repair manual.
There is no online resources that provides the 2001 Holden Astra CD workshop manual for free. Try contacting Holden for a copy of the original manual.
Remove the level plug.
Look in the manual.
Read the manual
the owners manual to your Astra sxi has all the uses of the function button and many m ore explanations about how to use the many features of the Astra sxi.
By far the easiest way to answer this is to advise that you get the haynes manual for your model Astra. The subframe will need to be dropped to remove the gearbox.
In the owners manual Page 216 from memory
I did a How To writeup on fixing the Holden Astra rear window failure, with pictures, here: http://www.opelaus.com/forums/showthread.php?27769-AStra-Window-regulator-repair-replacement&p=635716#post635716
The engine number on an Opel Astra may be listed inside of the car manual if the number is not listed on the engine itself. Other vital information such as what kind of oil should be used is listed in the car manual as well.
Check your owners manual.
Read your drivers manual, the information you are looking for will be in there.