Throttle valve switch adjustment

[DAVECAD2.0]

1991 420SEL.
Attempting to bench adjust a new throttle valve switch using the FSM section 07.3-152 using a multimeter set to Ohms. I'm confused. It says to:
1. Ohmmeter: Set to measuring range 0= infiniity. Mine reads infinity as 1, and continuity as 000 or a beep when the leads are crossed.

2. Full load stop. Push the throttle valve to the full load stop. The display should be 0 ohms. Turn the throttle valve slightly in the direction of idle speed, the display should read infinity ohms. Mine stays at 1.

3. Idle speed stop: Push throttle valve to idle speed stop. Turn throttle valve switch until the display shows 0 ohms.
Lift throttle valve 0.2mm, the display should read infinity ohms.
This step was successful. Dialed it right in. However the Full load stop test does nothing. The meter never changed. Only pins 1 to 2 work. 2 to 3 does nothing over the test range for either Idle (closed) or Full Load (wide open). I did this test with the switch on the TV and with it off. Same results. Same results with the old switch. I replaced the switch just because it's a ***** to get at, and I was already in there to replace the donuts.
What if anything am I missing?

TIA Dave