What was the purpose of the maf sensor wiring mod?

[cully]

the early HDI looms suffered from poor connections within the loom (common crimp point joints)
How early is this cully?

the side effect of this was the ecu would log a inconsistency fault on the TPS and the IAT sensors
the earth mod would fix it
What other noticeable side effects, other than codes and lights, would this show?

ive never seen the issue on the latest 3 plug ecu's only single plug variants

it can also cause limp mod to be activated