[Richard L]

I wonder if you have a captured waveform of the FSi signal.

I notice that there is MAF sensor (yellow wire) to the ECU,. This signal is pretty close to the engine load except this does not contain accell. and decell. enrichment compensation/correction as the IDC signal. But is ios far better than boost only (single dimension).

Lifting off is a strange one, I hope it is reflected on the pin16.

One other useful measurement, can you put the meter on both wires and tell me if the voltage increase with load (blipping the throttle)?

The green wire is pretty fixed for the conventional fuel injection system, detecting a switch-to-ground signal (saturated). Feel free to try, both inputs are protected up to 600V.