348 TPS Setting , testing question

The info is on the pages C69-C95 (attached) which are usually missing in the available copies of the WSM. The described procedure refers to the use of a "55 pin interconnector" (a Ferrari special tool) which is inserted at the ECU connector but a simpler way to measure the voltages at the TPS is using a 3-pin interconnector there. I made one:

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As such? Its zeroing them but it shows the pins to use etc.
https://www.ferrarichat.com/forum/threads/348-throttle-position-sensor-adjustment.453969/

 

What you were reading on pages C12-13 is for the Throttle Position Switch on Motronic 2.5, installed on one bank only. It has a very similar housing as the Throttle Position Potentiometers (TPP) used on Motronic 2.7 (one on each bank) but completely different internals.

The potentiometers on Motronic 2.7 are not really adjustable (no slot holes) but can be rotated a tiny bit. The voltage readings on them (throttles closed) do not have to be absolutely equal, good enough if the reading on each falls between 400 and 600 mV. The ECUs will, at ignition "on", read the values on each TPP, take them as "base" (like zero) values and calculate from there up.

Before checking the TPP voltages at closed throttles, it is advisable to first check and equalise the gaps (0.02 to 0.05 mm) of the throttle plates via their stop screws at the bottom of the TB as the TPP readings depend mostly on where the throttle plates are (what angles they are at when closed).
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The voltage readings are taken between Pins 1 & 3 on the Left TPP and between Pins 2 & 3 on the Right TPP.