A method for verifying operation of a pressure control valve (140) on an agricultural implement (10) is provided. The method comprising the steps of setting each of a plurality of row unit's down pressure control valve (140) to a zero pressure, setting each of the row unit's lift pressure control valve (740) at a lift pressure to cause each said row unit (200) to raise. Each row unit is confirmed as raised (200). Each of the row unit's down pressure control valve (140) are set at a down pressure sufficient to counteract the lift pressure to cause the row unit (200) to lower. Each row unit (200) is confirmed as lowered.
