Impul man Sekiguchi claimed the top spot with a 1m35.951s to give the Toyota-powered contingent its first pole of the season, also ending a run of four poles for Nojiri and five for the Mugen Honda team.
Owing to poor weather conditions, the usual two-part knockout qualifying format was abandoned in favour of a single 30-minute session to decide the grid, with the track staying wet throughout.
