The AF and MF work normally. The USM works normally. This is shown in the attached video, which shows the ring being movable left-to-right, without having any effect on zoom function at all. I'm not sure whether, because of this play, the lens is not actually working from 17-40mm.
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Canon EF 17-40mm f/4L USM Lens
Aliexpress UK
eBay
Canon EF 17-40mm f/4L USM Lens
Aliexpress UK
Actual Pics of the lens.
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Flower Petal Lens Hood Shade replace EW-83J for Canon EF-S 17-55mm f/2.8 IS USM / 17-55 mm F2.8 IS USM EW 83J
Aliexpress UK
Canon EF 17-40mm F4 L USM Wide Angle Zoom Lens. The EF 17-40mm f/4L USM Lens is an ultra-wide-angle lens producing stunning clarity in a range of focal lengths. Produce consistent exposures with the large f/4 aperture over the 17-40 mm zoom range and create softer background blur with a 7-blade circular aperture diaphragm.
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eBay
Canon EF 17-40mm F4 L lens. Very nice condition. The optics are perfect: No scratches, fungus or haze. Photographs shown on this page is the actual item being sold. Optical condition. 1200D REBEL SLI.
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Great fully functional condition. Lens is optically great with very minor dust and minimal marks, which will of course not affect the image in any way. AF works well and the lens functions fully as intended.
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Canon EF 17-40mm F4 L USM Wide Angle Zoom Lens. The EF 17-40mm f/4L USM Lens is an ultra-wide-angle lens producing stunning clarity in a range of focal lengths. Produce consistent exposures with the large f/4 aperture over the 17-40 mm zoom range and create softer background blur with a 7-blade circular aperture diaphragm.
eBay