At the Aylmer end the route has been modified.
From the start of the path from Aylmer (the former rail-line) at Terry-Fox, it goes up Terry-Fox to Lavigne, then on Panorama and McCaffrey to route 148. (The last approved route continued along the former rail-line to Domaine Bellevue, then proceeded up ch Asaret to route 148).
More details (et en français) at http://www.heritagepontiac.ca/bicycle.htm
Carte de la route, Map of bicycle trail route.