Japanese automakers may have run out of the fuel that has driven profits higher for the past four years: the weaker yen.

Toyota Motor Corp. and Japan’s six other automakers may combine to earn ¥4.55 trillion in the fiscal year through March 2017, according to analysts’ estimates compiled by Bloomberg. That is a 5.5 percent increase from what analysts are projecting for the period ending next month and would be the slowest pace of growth in five years.

And these estimates may still be too optimistic. Changes in foreign exchange rates reduced operating income at Nissan Motor Co., Honda Motor Co. and Mazda Motor Corp. in the three months through December and provided the smallest boost to Toyota’s quarterly profit in more than three years. With the yen soaring last week to the strongest level since October 2014, earnings may fall next fiscal year, according to analysts at TIW Inc. and Mitsubishi UFJ Morgan Stanley Securities Co.

“Japanese automakers won’t be able to achieve their growth targets if we take the current spot rate of the yen,” Koichi Sugimoto, a Tokyo-based analyst at Mitsubishi UFJ Morgan Stanley, said by phone. “Profit will decline against previous years,” dropping by more than 10 percent for some companies, he estimates.

Driving down the value of the yen has been the cornerstone of policy under Prime Minister Shinzo Abe and his hand-picked Bank of Japan governor, Haruhiko Kuroda. The government and central bank have sought to boost profits for exporters like Toyota, betting the companies would then be able to raise prices, boost wages and stoke inflation.

Even after the BOJ adopted a negative interest rate policy last month, investors sought refuge from a global stock-market rout in haven currencies including the yen, exacerbating gains that Kuroda had been trying to discourage.

Concern is growing that the stronger yen will erode the competitiveness of Japanese exports and cut the value of profits brought home from overseas operations. A weaker outlook for earnings would also risk undermining the country’s annual wage negotiations. Japanese labor groups this week plan to tamp down their requests for wage increases, with Toyota’s union asking for ¥3,000 raises in base monthly salary, half as much as it requested last year.

“It’s difficult to expect profits to rise given the tailwind of (foreign exchange) has turned into a headwind,” Satoru Takada, a Tokyo-based analyst at TIW, said. “It’s possible that all carmakers will report profit decreases in the next fiscal year, depending on how strong the yen will go.”

Automakers joined other Japan stocks in climbing Monday after a report showed Japan’s economy shrank more than expected last quarter, boosting the outlook for central bank stimulus.

Exchange rate changes reduced operating income by a combined ¥61.9 billion for Nissan, Honda and Mazda in the quarter through December. At Toyota, currency swings boosted profit by ¥5 billion, the smallest amount in 13 quarters. This contributed to the world’s largest carmaker posting its first decline in quarterly operating profit in almost two years.

Last quarter’s results show some Japanese automakers began facing headwinds even before the yen strengthened to ¥110.99 against the dollar on Thursday. The currency has gained against all its 31 major peers this month.

Honda missed analysts’ estimates for net income, operating profit and revenue, and cut its fiscal year sales forecast by ¥50 billion. Honda Executive Vice President Tetsuo Iwamura declined to comment on “violent fluctuations” in the value of the yen during a Jan. 29 news conference.

Mitsubishi Motors Corp. also reduced its full-year sales forecast by ¥20 billion, while Suzuki Motor Corp. trimmed its profit target by ¥5 billion. Mitsubishi Motors attributed the change to “the current global economic situation and market trends,” while Suzuki cited the reversal of deferred tax assets.

Spokesmen for Subaru maker Fuji Heavy Industries Ltd., Nissan, Honda and Mazda declined to comment on the impact foreign exchange changes may have on results through the next fiscal year. Representatives for Toyota, Mitsubishi Motors and Suzuki did not immediately respond to emails sent outside normal business hours.

Toyota leads the pack among automakers most affected by the yen weakening. Every one-yen appreciation against the dollar reduces the company’s profit by about ¥40 billion, TIW’s Takada said.

“How can they make up for that? So far, they are solid in North America and China, but as the global economy loses traction, you can’t expect strong growth in volumes there,” he said.

Sales in the U.S. rose 5.7 percent last year to 17.5 million. Analysts and executives entered 2016 expecting slower growth, and deliveries slipped 0.3 percent in January. Toyota and Nissan each increased incentive spending by more than 15 percent for the month, according to researcher Autodata Corp.

“I expect the Japanese OEMs to be less competitive on price in an environment of stronger yen,” Robin Zhu, an analyst at Sanford C. Bernstein, said. “U.S. market profitability will probably be impacted.”

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