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Yes, you can use it.
Full information on the ABC (Automatic Border Clearance) system at Toronto Pearson is available on their website, but the key parts for you:
Canadian citizens and permanent residents of Canada who have a valid Canadian passport or permanent resident card now have the option of using an Automated Border Clearance kiosk upon their return to Canada. The kiosks do not require pre-registration by guests or payment of any membership fees.
So you won't have to do anything, as long as you have your Canadian passport with you, you should be able to make use of the ABC system.