How much time do you have? The ECM is located behind the dash, above the heater ducts, in the center, on the firewall. Do 'ya think maybe they didn't want to find it?
PS. Go buy a repair manual to help you remove panels and components in the proper order. If you don't, you will never get it back together.
on my 1999 ford mercury villager its on top of transmission under the van
There is no such device on a '97 villager.
Replace the transmission computer. Located under the center console.
What is the fuel tank capacity of a 1997 Mercury Villager van?
O2 sensors are always located on the exhaust system.
Bottom front of engine.
The 1995 Mercury link connection is located on the bottom of the dashboard. The link connection will be on the passenger side of the dashboard.
The fuel pump is mounted on top and inside the fuel tank.
The evaporator is in the A/C heater box under the dash.
It's located on the back side of the intake manifold. It's screwed into the manifold.
This is not possible on a modern vehicle like the Villager.
1999-2002 Villager or Nissan Quest.