Jang, who shot 68 in the first round, birdied four holes in a row to go a shot up on compatriot Kim Hyo-joo and two up on Americans Stacy Lewis and Kim Kaufman in third.
Kim shot a 65 in the first round and finished the second with a 69, while Lewis, who won the event in 2013, followed her sizzling 64 first round with a 71 in the second.
Rain halted play in Thursday's opening round, forcing players to resume early on Friday before the second round could get underway.
(Reporting by Cameron French; Editing by Peter Rutherford)
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