Wiring NGK Powerdex AFX to the V1 scan tool

[voda1]

Does the V1 need to be grounded from pin D?

The Powerdex has 2 analog wires - 1 for the analog device and 1 for a analog ground. Instruction further state that the analog ground must end at the same place as the controller ground.

method 1
Analog grd wire from Powedex to V1-pin D plus another wire from pin D to Powerdex ctrl grd

method 2
grd wire from V1 pin D to Powerdex ctrl grd

method 3
no wire from V1 pin D

[joecar]

V1 pin D must be connected to the analog ground.

So try method 1.