Injection is a scam. Only to be used as a last resort when you can't dig.
As previously mentioned by antlerman, all concrete cracks and he is absolutely correct about that.
If your basement waterproofing was worth a damn you could have a hundred cracks in your foundation wall and it should not leak.
The problem is that your waterproofing has failed, not that your foundation wall has cracked. Concrete absorbs moisture as tboy correctly stated. The moisture wicks into the concrete, then it freezes, then the concrete blows apart and begins to scale. (Especially if the concrete is not air entrained.) The trick is to keep the moisture OUT of the concrete.
I've seen a lot of residential sites and the waterproofing is a joke. It's usually some kid with a pail of black goo from Home Depot putting it on with a brush. Totally incorrectly and totally crap product. How the fuck they get away with it is beyond me.
If you want to properly waterproof your basement wall, I would recommend Hot Rubberized Aspalt by Bakor as per OPSS 914, complete with mesh reinforcement and then the drainage membrane down to a 4" perforated PVC subdrain with 6" of clear stone, surrounded by Geotextile weave. (Holes down!!!)
Here:
http://www.bakor.com/roofing_hotrubber.asp
It's about as tried and true as you get.
OR, I saw this stuff on Holmes, as well as the Home Show and thought it was pretty impressive, though I have no experience with it.
http://www.advancedcoatings.on.ca/rub-r-wall-airtight.html
If you want the Cadilac of Waterproofing, I would suggest "The Eliminator" as distributed in Ontario by Multiseal. Very expensive stuff, but they use it waterproof the heaviest structures going.
http://www.stirlinglloyd.com/uk_worldwide/products/bridges/seamless/eliminator/eliminator-1-of-3.htm
Concrete should not be acting like a boat to keep moisture out. Sorry to poo in your cherios. Anyone who tells you otherwise is ignorant on the issue.