The pair has enjoyed a decent rally in the past 36 hours.
A combination of stronger Aussie and Chinese data plus a softer yen has seen AUDJPY continue its run higher as per my post yesterday here.
Having now breached a couple of good resistance levels into 0.8385 we've seen a few more sellers at 84.00 as AUDUSD fails above 0.7700 for the moment. Large offers at 0.7750 will be casting a shadow but for the moment I expect the pair to remain underpinned.
Currently 83.82 there's another decent line on the topside at 84.60 but support/bids should come in now around 83.30-50
Update 06.10 GMT - Having seen the AUDUSD option expiries at 0.7700 this might have more resistance and caution is advised on further gains.