[1][2] Eciru was born 11 August 1970[1] at Ookai Village, Dokolo Parish, Gweri sub-county in Soroti District.
[3] He was ordained a priest on 9 August 2003, at St. Patrick's Catholic Parish, Madera by Bishop Erasmus Desiderius Wandera.
[1][3] Eciru later obtained a Licentiate in Sacred Scripture at the Pontifical Biblical Institute (Biblicum), in Rome.
[3][4] Father Eciru served as a lecturer of Latin at St. Peter's Seminary Madera, before he lectured Sacred Scripture at St. Paul's National Seminary Kinyamasika, in Fort Portal, in the Western Region of Uganda.
At the time of his appointment as Bishop of Soroti Diocese he was serving as Lecturer of Sacred Scripture at St. Mary's National Seminary in Ggaba, Kampala.