[Richard L]

Do you have a digital voltmeter?

The basic wiring for the IDC signal appeared to be working as design. As direct injection systems have many variations, we now need to find tune the incoming signal. At present, it appears the IDC signal is a bit on the high side.

There are 30 test pins on the HFS-3. Pin16 confirm what the HFS-3 is seeing. 0-5V = 0-100% DC. If you can tell me what voltage at pin16 we are reading in the following conditions:

Idle ........ ? volt
cruising ....... ? volt
WOT ....... ? volt

Alternatively, you can put the jumper link to "FDC "and read the Fuel duty cycle % from the gauge.