Fiat Chrysler also agreed to accelerate the pace at which new workers move up to full wages, another provision of the G.M. deal.

That had been a sticking point.

“FCA says it’s too rich,” Denise Hammond, a spokeswoman for Unifor, said of the union’s pay demand earlier on Monday. “But our members deserve this, and it’s only fair after years of zeros they have received.”

While Fiat Chrysler is the largest employer in Canada among the three Detroit-based car companies, it is also the weakest financially. As of last month, it was third over all in sales in the United States. While it had a pickup truck and two Jeep models in the top 20 selling vehicles in the American market, none of its passenger cars made the list.

A walkout would have affected Chrysler’s only minivan plant, which is in Windsor and was recently refurbished at a cost of about 3 billion Canadian dollars for the production of a new model. Other factories where a strike was threatened were the assembly plant in Brampton and an aluminum casting factory in Toronto.

Mr. Dias said Chrysler would invest in the casting plant, but he did not offer specifics and acknowledged that some workers there would be laid off.

Because the overwhelming majority of vehicles made by Fiat Chrysler in Canada are exported to the United States, a strike would have mainly affected the American market.