before you go the computer route,make sure you don't have a broken/corroded wire.there is a splice in the taped harness that branchs off into many different circuits. corrosion gets there-creates bad connection.I think the asd relay should have 2 positive wires 1 battery + and 1 with the key on.Use the wire schematic,Check the computer harness make sure you have all power and grounds going to it. The ground on the engine also goes bad.battery cable,also main harness ground all on the same stud. if all ok, yes the computer controls ground. for test purposing you can ground/jump the relay,see if that is the only problem. use a fused jumper wire.