Glow plug light and eml light for p0102 code no 1v on black wire to maf sensor

I brought a 2006 Skoda with cam belt failure at 325k few weeks ago rebuilt top end with full set of rockers and cam bearings .it's now got a glow plug light flashing and eml light on with a code of p0102 relating to low signal from Maf sensor .checked each pin using pin out data from auto data and the black wire that is ment to have a 1v supply from ecu has a reading of 0.01v I've checked wiring up to ecu and checked the power out of the pin of ecurelating to the black wire and there is no 1v output .would this be ecu fault or could something else cause this ?