Working on a major project of wiring an S type ECU & Engine into a kitcar, We have the electricat drawings and feel we have met all the conditions for powering put the Powertrain module. When we plug in the ODB2 we fail to connect. We've completely reworked the Cables to the FH-1 Connector on the ECU building our on fuse box and relay's .

Has anyone attempted this and can anyone suggest any tips.

Q) does the ECU power up and squak ODB2 if the Alarm module is not connected in the loom. ?