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CAMBRIDGE — Prime Minister Stephen Harper and Ontario Premier Dalton McGuinty are scheduled to visit the Toyota plant in Cambridge Wednesday morning to make an announcement.

The purpose of the visit, announced Tuesday afternoon, is being kept under wraps. The two political leaders are also expected to take a tour of the sprawling auto plant.

Several weeks ago at the Ford plant in Oakville, Harper announced an extension of the federal Automotive Innovation Fund, which will provide $250 million in government funding to boost innovation at Canadian auto manufacturers and their suppliers.

Toyota has already received funding under the program. In 2011, it received a $70-million loan from Ottawa and a $70-million grant from the province to produce more fuel-efficient vehicles and undertake energy-saving upgrades at its plants in Cambridge and Woodstock.

Dubbed Project Green Light, the Toyota initiative included an investment of up to $400 million from the company.

The company is adding 800 jobs in Cambridge and Woodstock as it ramps up production of the Lexus and RAV4 models.