I am flying from YVR Vancouver through PEK to HND Japan and I have 1:40 mins lay over

My question is I dont know actually which terminals my flights will be and they are all booked through air china I got the ticket for a really cheap price and it's not refundable please help me out here now I am confused after I read reviews on the internet

Probably it's at T3 and its I - I and I read on Air China's website that it takes 1 hour