Toyota engineers found an electronic software problem that caused "sudden unintended acceleration" in a test vehicle during pre-production trials, according to a company engineering document obtained by and translated for CNN. The 2006 document, marked "confidential," recounted the results of an adaptive cruise-control software test in a model internally designated the 250L, a vehicle later sold as the Lexus 460 in Japan and Europe. The document says a "fail-safe overhaul" would be needed for another model in production, internally designated the 180L, which the company says was later sold as a Toyota Tundra.
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