The USDJPY shot up from the low after taking out the 103.51 low from last Friday but was not able to make any further downside movement after printing the 103.46 low (See chart).  The pair shot up as short covers entered the market.  The sharp move also supported the GBPJPY and EURJPY. 

Resistance in the USDJPY really does not come in until 104.17 (the 100 hour moving average).