P2413 7A EGR sytem performance fault code on Autel MaxiDiag. Cleaned EGR, tested on workbench all OK including movement and resistance readings. No performance change when MIL light comes back on after erasing code. Have checked wires 1 and 5 getting 3.4mv on tick over I take this as zero. But it stays at this reading when engine accelerated when it should rise to 5v.No MAF on this engine only turbo pressure and air temp sensors fitted. Any ideas where to check next???

Les