PdfTeX - letter é catcode def

Hi,

I would like to know why my TeX (not LaTeX) code don't work with PdfTeX.
It seams to work fine with XeTeX and LuaTeX.

My environement is TeXWorks setup with UTF-8 encoding.

the char é don't appear with PdfTeX. How to solve that using PdfTeX in
TeX mode (not LaTeX) ?

My code:

\catcode"00E9\active

\begingroup\lccode

`~="00E9\lowercase{

\endgroup

\def~}{\'e}

Bonjour !

é

Cet été

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Vincent Breton

Concepteur et développeur de solutions techniques innovantes.

    L'obsolescence programmée et la perte des savoir-faire commence par
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